IEC 60335-2-21:2002

INTERNATIONAL IEC
STANDARD 60335-2-21
Edition 5.1
2004-11
Edition 5:2002 consolidated with amendment 1:2004
Household and similar electrical appliances –
Safety –
Part 2-21:
Particular requirements for storage
water heaters
This English-language version is derived from the original
bilingual publication by leaving out all French-language
pages. Missing page numbers correspond to the French-
language pages.
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INTERNATIONAL IEC
STANDARD 60335-2-21
Edition 5.1
2004-11
Edition 5:2002 consolidated with amendment 1:2004
Household and similar electrical appliances –
Safety –
Part 2-21:
Particular requirements for storage
water heaters
© IEC 2004 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
CH
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

60335-2-21 © IEC:2002+A1:2004 – 3 –

CONTENTS
FOREWORD.5

INTRODUCTION.11

1 Scope.13

2 Normative references .13

3 Definitions .15

4 General requirement.17
5 General conditions for the tests .17
6 Classification.17
7 Marking and instructions.17
8 Protection against access to live parts.19
9 Starting of motor-operated appliances .21
10 Power input and current .21
11 Heating .21
12 Void.21
13 Leakage current and electric strength at operating temperature.21
14 Transient overvoltages .21
15 Moisture resistance .21
16 Leakage current and electric strength.21
17 Overload protection of transformers and associated circuits .21
18 Endurance.23
19 Abnormal operation .23
20 Stability and mechanical hazards .25
21 Mechanical strength .25
22 Construction .25
23 Internal wiring.29
24 Components .29
25 Supply connection and external flexible cords .31
26 Terminals for external conductors.33
27 Provision for earthing .33

28 Screws and connections .33
29 Clearances, creepage distances and solid insulation .33
30 Resistance to heat and fire.33
31 Resistance to rusting.33
32 Radiation, toxicity and similar hazards.33

Annexes .39
Annex A (informative) Routine tests .39

Bibliography.41

Figure 101 – Examples of types of storage water heaters .35
Figure 102 – Examples of positions of the thermocouples.37

60335-2-21 © IEC:2002+A1:2004 – 5 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION

–––––––––––––
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –

SAFETY –
Part 2-21: Particular requirements for storage water heaters

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

This part of International Standard IEC 60335 has been prepared by IEC technical committee 61:
Safety of household and similar electrical appliances.
This consolidated version of IEC 60335-2-21 consists of the fifth edition (2002) [documents
61/2135/FDIS and 61/2160/RVD] and its amendment 1 (2004) [documents 61/2683/FDIS and
61/2719/RVD].
The technical content is therefore identical to the base edition and its amendment and has
been prepared for user convenience.
It bears the edition number 5.1.
A vertical line in the margin shows where the base publication has been modified by
amendment 1.
The French version of this standard has not been voted upon.

60335-2-21 © IEC:2002+A1:2004 – 7 –

This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments. It was established on the basis of the fourth edition (2001) of that standard.

NOTE 1 When “Part 1” is mentioned in this standard, it refers to IEC 60335-1.

This part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to
convert that publication into the IEC standard: Safety requirements for electric storage water
heaters.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies
as far as is reasonable. When this standard states "addition", "modification", or "replacement",

the relevant text in Part 1 is to be adapted accordingly.

NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The following differences exist in the countries indicated below.
– 6.1: Class 0I appliances are allowed (Japan).
– 6.2: IPX0 water heaters are allowed (France, Portugal, United Kingdom and USA).
– 7.1: Additional markings are required (Australia, New Zealand and South Africa).

– 7.1: The rated pressure is to be marked in pounds per square inch (USA).
– 7.1: Open outlet water heaters are not required to be marked with rated pressure (USA).
– 7.12.1: Additional instructions are required (South Africa).
– 11.7: The test is different (USA).
– 19.1: Water heaters that have all four features and are not liable to be emptied in normal
use are not subjected to the test of 19.101 (South Africa).
– 19.1: Appliances incorporating sheathed heating elements are not required to have an
outer enclosure of metal but their rated power input is limited to 12 kW (USA).
– 19.101: The test is different (USA).

60335-2-21 © IEC:2002+A1:2004 – 9 –

– 22.101: Pressure reducing valves have to be designed for an inlet pressure of 2 MPa

(South Africa).
– 22.101: The minimum rated pressure is 1,0 MPa (Denmark, Finland, Norway and

Sweden).
– 22.102: The minimum pressure is 2,1 MPa. The test is not carried out on water heaters
having a capacity less than 2 l or on appliances having containers open to the atmosphere

(USA).
– 22.103: Closed water heaters have to incorporate a pressure-relief device (Norway).

– 22.103: Closed water heaters have to incorporate a pressure-relief device sensitive to

both pressure and temperature that operates before the water temperature reaches 99 °C

(Australia and New Zealand).
– 22.103: Closed water heaters having a capacity exceeding 50 l or a rated power input
exceeding 2 kW have to incorporate a pressure-relief device sensitive to both pressure
and temperature that operates before the water temperature reaches 99 °C (South Africa).
– 22.103: Closed water heaters have to incorporate a temperature relief valve or a combined
temperature and pressure-relief valve that operates before the water temperature reaches
100 °C (United Kingdom).
– 22.106: All water heaters have to incorporate a thermal cut-out (India).
– 22.106: The thermal cut-out of single-phase closed water heaters need only provide single-pole
disconnection (Japan).
– 22.106: For all closed water heaters, the thermal cut-out is to provide all-pole
disconnection (France, Netherlands, Norway and Switzerland).
– 22.109: A tool is not required for draining the appliance (Canada and USA).
– 22.110: Additional requirements apply to plastic or resin-based containers (South Africa).
– 22.112: The temperature limit is 95 °C (South Africa).
– 22.112: The temperature limit is 85 °C (USA).
– 24.101: Thermal cut-outs are required to have a trip-free switching mechanism (USA).
– 24.102: The maximum water temperature is 90 °C (Australia and New Zealand).
– 24.102: The maximum water temperature is 99 °C (Japan, Norway, Portugal, United
Kingdom and USA)
– 24.102: The temperature limit of 130 °C is only allowed for closed water heaters having a
rated pressure of at least 0,4 MPa (South Africa).

60335-2-21 © IEC:2002+A1:2004 – 11 –

INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its

provisions is entrusted to appropriately qualified and experienced persons.

This standard recognizes the internationally accepted level of protection against hazards such

as electrical, mechanical, thermal, fire and radiation of appliances when operated as in

normal use taking into account the manufacturer's instructions. It also covers abnormal

situations that can be expected in practice and takes into account the way in which

electromagnetic phenomena can affect the safe operation of appliances.

It also covers abnormal situations that can be expected in practice.
This standard takes into account the requirements of IEC 60364 as far as possible so that
there is compatibility with the wiring rules when the appliance is connected to the supply
mains. However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another part 2 of IEC 60335, the relevant part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of
the requirements and, if found to be substantially equivalent, may be considered to comply
with the standard.
60335-2-21 © IEC:2002+A1:2004 – 13 –

HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –

SAFETY –
Part 2-21: Particular requirements for storage water heaters

1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of electric storage water heaters for
household and similar purposes and intended for heating water below boiling temperature,
their rated voltage being not more than 250 V for single-phase appliances and 480 V for
other appliances.
Appliances not intended for normal household use but which nevertheless may be a source of
danger to the public, such as appliances intended to be used by laymen in shops, in light
industry and on farms, are within the scope of this standard.
As far as is practicable, this standard deals with the common hazards presented by
appliances that are encountered by all persons in and around the home. However, in general,
it does not take into account
– the use of appliances by young children or infirm persons without supervision;
– playing with the appliance by young children.

NOTE 101 Attention is drawn to the fact that
– for appliances intended to be used at high altitudes, additional requirements may be necessary;
– for appliances intended to be used in vehicles or on board ships or aircraft, additional requirements may be
necessary;
– in many countries additional requirements are specified by the national health authorities, the national
authorities responsible for the protection of labour and similar authorities;
– in many countries regulations exist for the installation of equipment connected to the water mains.

NOTE 102 This standard does not apply to
– appliances for boiling water (IEC 60335-2-15);
– instantaneous water heaters (IEC 60335-2-35);

– commercial dispensing appliances and vending machines (IEC 60335-2-75);
– appliances intended exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the presence of a
corrosive or explosive atmosphere (dust, vapour or gas).
2 Normative references
This clause of Part 1 is applicable.

60335-2-21 © IEC:2002+A1:2004 – 15 –

3 Definitions
This clause of Part 1 is applicable except as follows.

3.1.9 Replacement:
normal operation
operation of the appliance after installation in accordance with the instructions and filled with

cold water
3.101
storage water heater
stationary appliance for heating and storing water in a container and incorporating devices
to control the water temperature
3.102
closed water heater
unvented storage water heater intended to operate at the pressure of the water system, the
flow of water being controlled by one or more valves in the outlet system
NOTE 1 A closed water heater is shown in Figure 101a.
NOTE 2 The operating pressure may be the output pressure of a reducing or boosting device.
3.1
...

NORME CEI
INTERNATIONALE 60335-2-21
Edition 5.1
2004-11
Edition 5:2002 consolidée par l’amendement 1:2004
Appareils électrodomestiques et analogues –
Sécurité –
Partie 2-21:
Règles particulières pour les chauffe-eau
à accumulation
Cette version française découle de la publication d’origine
bilingue dont les pages anglaises ont été supprimées.
Les numéros de page manquants sont ceux des pages

supprimées.
Numéro de référence
CEI 60335-2-21:2002+A1:2004(F)

Numérotation des publications
Depuis le 1er janvier 1997, les publications de la CEI sont numérotées à partir de

60000. Ainsi, la CEI 34-1 devient la CEI 60034-1.

Editions consolidées
Les versions consolidées de certaines publications de la CEI incorporant les

amendements sont disponibles. Par exemple, les numéros d’édition 1.0, 1.1 et 1.2

indiquent respectivement la publication de base, la publication de base incorporant

l’amendement 1, et la publication de base incorporant les amendements 1 et 2

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NORME CEI
INTERNATIONALE 60335-2-21
Edition 5.1
2004-11
Edition 5:2002 consolidée par l’amendement 1:2004
Appareils électrodomestiques et analogues –
Sécurité –
Partie 2-21:
Règles particulières pour les chauffe-eau
à accumulation
© IEC 2004 Droits de reproduction réservés
Aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun
procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
CH
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur

– 2 – 60335-2-21 © CEI:2002+A1:2004

SOMMAIRE
AVANT-PROPOS.4

INTRODUCTION.10

1 Domaine d’application .12

2 Références normatives.12

3 Définitions .14

4 Exigences générales .16

5 Conditions générales d’essais .16
6 Classification.16
7 Marquage et instructions .16
8 Protection contre l’accès aux parties actives .18
9 Démarrage des appareils à moteur.20
10 Puissance et courant .20
11 Echauffements.20
12 Vacant.20
13 Courant de fuite et rigidité diélectrique à la température de régime .20
14 Surtensions transitoires.20
15 Résistance à l’humidité.20
16 Courant de fuite et rigidité diélectrique .20
17 Protection contre la surcharge des transformateurs et des circuits associés.20
18 Endurance.22
19 Fonctionnement anormal.22
20 Stabilité et dangers mécaniques .24
21 Résistance mécanique.24
22 Construction.24
23 Conducteurs internes .28
24 Composants.28
25 Raccordement au réseau et câbles souples extérieurs .30
26 Bornes pour conducteurs externes .32
27 Dispositions en vue de la mise à la terre .32
28 Vis et connexions.32
29 Distances dans l’air, lignes de fuite et isolation solide .32
30 Résistance à la chaleur et au feu.32
31 Protection contre la rouille.32
32 Rayonnement, toxicité et dangers analogues.32

Annexes .38
Annexe A (informative) Essais de série.38

Bibliographie.40

Figure 101 – Exemples de types de chauffe-eau à accumulation .34
Figure 102 – Exemples de positions des thermocouples .36

– 4 – 60335-2-21 © CEI:2002+A1:2004

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE

–––––––––––
APPAREILS ÉLECTRODOMESTIQUES ET ANALOGUES –

SÉCURITÉ –
Partie 2-21: Règles particulières pour

les chauffe-eau à accumulation

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a
pour objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les
domaines de l'électricité et de l'électronique. A cet effet, la CEI – entre autres activités – publie des Normes
internationales, des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au
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selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
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intéressés sont représentés dans chaque comité d’études.
3) Les Publications de la CEI se présentent sous la forme de recommandations internationales et sont agréées
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La présente partie de la Norme internationale CEI 60335 a été établie par le comité
d’études 61 de la CEI: Sécurité des appareils électrodomestiques et analogues.
La présente version consolidée de la CEI 60335-2-21 comprend la cinquième édition (2002)
et son amendement 1 (2004) [documents 61/2683/FDIS et 61/2719/RVD].
Le contenu technique de cette version consolidée est donc identique à celui de l'édition de
base et à son amendement; cette version a été préparée par commodité pour l'utilisateur.
Elle porte le numéro d'édition 5.1.
Une ligne verticale dans la marge indique où la publication de base a été modifiée par
l'amendement 1.
La version française de cette norme n’a pas été soumise au vote.

– 6 – 60335-2-21 © CEI:2002+A1:2004

La présente partie 2 doit être utilisée conjointement avec la dernière édition de la CEI 60335-1 et
ses amendements. Elle a été établie sur la base de la quatrième édition (2001) de cette norme.

NOTE 1 L’expression «Partie 1» utilisée dans la présente norme fait référence à la CEI 60335-1.

La présente partie 2 complète ou modifie les articles correspondants de la CEI 60335-1 de
façon à transformer cette publication en norme CEI: Règles de sécurité pour les chauffe-eau
électriques à accumulation.
Lorsqu'un paragraphe particulier de la Partie 1 n'est pas mentionné dans cette partie 2, ce

paragraphe s'applique pour autant qu'il est raisonnable. Lorsque la présente norme spécifie

«addition», «modification» ou «remplacement», le texte correspondant de la Partie 1 doit être

adapté en conséquence.
NOTE 2 Le système de numérotation suivant est utilisé:
– paragraphes, tableaux et figures: ceux qui sont numérotés à partir de 101 sont complémentaires à ceux de la
Partie 1;
– notes: à l’exception de celles qui sont dans un nouveau paragraphe ou de celles qui concernent des notes de
la Partie 1, les notes sont numérotées à partir de 101, y compris celles des articles ou paragraphes qui sont
modifiés ou remplacés;
– les annexes supplémentaires sont appelées AA, BB, etc.
NOTE 3 Les caractères d'imprimerie suivants sont utilisés:
– prescriptions: caractères romains;
– modalités d'essais: caractères italiques;
– notes: petits caractères romains.
Les mots en gras dans le texte sont définis à l'Article 3. Lorsqu'une définition concerne un adjectif, l'adjectif et le
nom associé figurent également en gras.
Le comité a décidé que le contenu de la publication de base et de ses amendements ne sera
pas modifié avant la date de maintenance indiquée sur le site web de la CEI sous
"http://webstore.iec.ch" dans les données relatives à la publication recherchée. A cette date,
la publication sera
• reconduite,
• supprimée,
• remplacée par une édition révisée, ou
• amendée.
Les différences suivantes existent dans les pays indiqués ci-après.
– 6.1: Les appareils de la classe 0I sont autorisés (Japon ).
– 6.2: Les chauffe-eau IPX0 sont autorisés (France, Portugal, Royaume-Uni et USA).

– 7.1: Les marquages complémentaires sont prescrits (Afrique du Sud, Australie et Nouvelle
Zélande).
– 7.1: La pression assignée doit être marquée en livres par pouce carré (USA).
– 7.1: Le marquage de la pression assignée n’est pas requis pour les chauffe-eau à
écoulement libre (USA).
– 7.12.1: Des instructions supplémentaires sont requises (Afrique du Sud).
– 11.7: L’essai est différent (USA).
– 19.1: Les chauffe-eau qui comportent les quatre caractéristiques mentionnées et ne sont
pas susceptibles d’être vidés en usage normal ne sont pas soumis à l’essai de 19.101
(Afrique du Sud).
– 19.1: Les appareils comportant des éléments chauffants blindés ne doivent pas
nécessairement comporter d’enveloppe extérieure en métal mais leur puissance assignée
est limitée à 12 kW (USA).
– 19.101: L’essai est différent (USA).

– 8 – 60335-2-21 © CEI:2002+A1:2004

– 22.101: Les dispositifs réducteurs de pression doivent être construits pour une pression à

l’entrée de 2 MPa (Afrique du Sud).

– 22.101: La pression assignée minimale est de 1,0 MPa (Danemark, Finlande, Norvège et

Suède).
– 22.102: La pression minimale est de 2,1 MPa. L’essai n’est ni effectué sur les chauffe-eau
dont la capacité est inférieure à 2 l ni sur les appareils comportant des cuves ouvertes à

l’air libre (USA).
– 22.103: Les chauffe-eau fermés doivent comporter un dispositif limiteur de pression

(Norvège).
– 22.103: Les chauffe-eau fermés doivent comporter un dispositif limiteur de pression

sensible à la fois à la pression et à la température qui fonctionne avant que la température
de l’eau n’atteigne 99 °C (Australie et Nouvelle Zélande).
– 22.103: Les chauffe-eau fermés dont la capacité excède 50 l ou la puissance assignée
2 kW doivent comporter un dispositif limiteur de pression, sensible à la fois à la pression
et à la température, qui fonctionne avant que la température de l’eau n’atteigne 99 °C
(Afrique du Sud).
– 22.103: Les chauffe-eau fermés doivent comporter un dispositif limiteur de pression
sensible à la température ou un dispositif sensible à la fois à la pression et à la
température qui fonctionne avant que la température de l'eau n’atteigne 100 °C (Royaume
Uni).
– 22.106: Tous les chauffe-eau doivent comporter un coupe-circuit thermique (Inde).
– 22.106: Le coupe-circuit thermique des chauffe-eau fermés monophasés peut n’assurer qu’une
coupure omnipolaire (Japon).
– 22.106: Pour tous les chauffe-eau fermés, le coupe-circuit thermique doit assurer une
coupure omnipolaire (France, Pays-Bas, Norvège et Suisse).
– 22.109: L’utilisation d’un outil pour vidanger l’appareil n’est pas exigée (Canada et USA).
– 22.110: Les cuves en matière plastique ou à base de résine sont soumises à des
prescriptions complémentaires (Afrique du Sud).
– 22.112: La limite de température est de 95 °C (Afrique du Sud).
– 22.112: La limite de température est de 85 °C (USA).
– 24.101: Les coupe-circuit thermiques doivent avoir un mécanisme interrupteur à
déclenchement libre (USA).
– 24.102: La température maximale de l’eau est de 90 °C (Australie et Nouvelle Zélande).
– 24.102: La température maximale de l’eau est de 99 °C (Japon, Norvège, Portugal,
Royaume-Uni et USA)
– 24.102: La limite de température de 130 °C n’est autorisée que pour des chauffe-eau
fermés dont la pression assignée est au moins égale à 0,4 MPa (Afrique du Sud).

– 10 – 60335-2-21 © CEI:2002+A1:2004

INTRODUCTION
Il a été considéré en établissant la présente Norme internationale que l'exécution de ses dis-

positions était confiée à des personnes expérimentées et ayant une qualification appropriée.

Cette norme reconnaît le niveau de protection internationalement accepté contre les risques

électriques, mécaniques, thermiques, liés au feu et au rayonnement des appareils, lorsqu'ils

fonctionnent comme en usage normal en tenant compte des instructions du fabricant. Elle

couvre également les situations anormales auxquelles on peut s'attendre dans la pratique et

prend en considération les phénomènes électromagnétiques qui peuvent affecter le

fonctionnement en toute sécurité des appareils.

Cette norme tient compte autant que possible des prescriptions de la CEI 60364, de façon à
rester compatible avec les règles d'installation quand l’appareil est raccordé au réseau
d’alimentation. Cependant, des règles nationales d'installation peuvent être différentes.
Si un appareil compris dans le domaine d’application de cette norme comporte également des
fonctions qui sont couvertes par une autre partie 2 de la CEI 60335, la partie 2 corres-
pondante est appliquée à chaque fonction séparément, dans la limite du raisonnable. Si cela
est applicable, on tient compte de l’influence d’une fonction sur les autres fonctions.
Cette norme est une norme de famille de produits traitant de la sécurité d’appareils et a
préséance sur les normes horizontales et génériques couvrant le même sujet.
Un appareil conforme au texte de la présente norme ne sera pas nécessairement jugé
conforme aux principes de sécurité de la norme si, lorsqu'il est examiné et soumis aux essais,
il apparaît qu'il présente d'autres caractéristiques qui compromettent le niveau de sécurité
visé par ces prescriptions.
Un appareil utilisant des matériaux ou présentant des modes de construction différents de
ceux décrits dans les prescriptions de cette norme peut être examiné et essayé en fonction
de l'objectif poursuivi par ces prescriptions et, s'il est jugé pratiquement équivalent, il peut
être estimé conforme aux principes de sécurité de la norme.

– 12 – 60335-2-21 © CEI:2002+A1:2004

APPAREILS ÉLECTRODOMESTIQUES ET ANALOGUES –

SÉCURITÉ –
Partie 2-21: Règles particulières pour

les chauffe-eau à accumulation

1 Domaine d’application
L’article de la Partie 1 est remplacé par l’article ci-après.
La présente Norme internationale traite de la sécurité des chauffe-eau à accumulation pour
usages domestiques et analogues destinés à chauffer l’eau à une température inférieure à la
température d’ébullition dont la tension assignée n'est pas supérieure à 250 V pour les
appareils monophasés et à 480 V pour les autres appareils.
Les appareils qui ne sont pas destinés à un usage domestique normal mais qui peuvent
néanmoins constituer une source de danger pour le public, tels que les appareils destinés à
être utilisés par des usagers non avertis dans des magasins, chez des artisans et dans des
fermes, sont compris dans le domaine d'application de la présente norme.
Dans la mesure du possible, la présente norme traite des risques ordinaires présentés par les
appareils, encourus par tous les individus à l'intérieur et autour de l'habitation. Cependant,
cette norme ne tient pas compte en général
– de l'utilisation des appareils par de jeunes enfants ou par des personnes handicapées,
sans surveillance;
– de l’emploi de l’appareil comme jouet par de jeunes enfants.
NOTE 101 L’attention est attirée sur le fait que:
– pour les appareils destinés à être utilisés à haute altitude, des prescriptions supplémentaires peuvent être
nécessaires;
– pour les appareils destinés à être utilisés dans des véhicules ou à bord de navires ou d’avions, des
prescriptions supplémentaires peuvent être nécessaires;
– dans de nombreux pays, des prescriptions supplémentaires sont spécifiées par les organismes nationaux de la
santé, par les organismes nationaux responsables de la protection des travailleurs et par des organismes
similaires;
– dans de nombreux pays, des réglementations existent pour l'installation des équipements raccordés au réseau
d'alimentation en eau.
NOTE 102 La présente norme ne s’applique pas:

– aux appareils pour faire bouillir l'eau (CEI 60335-2-15);
– aux chauffe-eau instantanés (CEI 60335-2-35);
– aux distributeurs commerciaux avec ou sans moyens de paiement (CEI 60335-2-75);
– aux appareils destinés exclusivement aux usages industriels;
– aux appareils destinés à être utilisés dans des locaux présentant des conditions particulières, telle que la
présence d'une atmosphère corrosive ou explosive (poussière, vapeur ou gaz).
2 Références normatives
L’article de la Partie 1 est applicable.

– 14 – 60335-2-21 © CEI:2002+A1:2004

3 Définitions
L’article de la Partie 1 est applicable avec les exceptions suivantes.

3.1.9 Remplacement:
conditions de fonctionnement normal

fonctionnement de l’appareil après installation conformément aux instructions et rempli d’eau

froide
3.101
chauffe-eau à accumulation
appareil fixe destiné à chauffer et à conserver de l’eau dans une cuve et muni de dispositifs
contrôlant la température de l’eau
3.102
chauffe-eau fermé
chauffe-eau à accumulation non ouvert à l’air libre prévu pour fonctionner à la pression du
système d’alimentation en eau, l’écoulement de l’eau étant commandé par un ou plusieurs
robinets placés dans le circuit de sortie
NOTE 1 Un chauffe-eau fermé est illustré à la Figure 101a.
NOTE 2 La pression de fonctionnement peut être la pression à la sortie d'un dispositif réduisant ou augmentant la
pression.
3.103
chauffe-eau à réservoir séparé
chauffe-eau à accumulation ouvert à l’air libre et prévu pour être alimenté en eau par
gravité à partir d’un réservoir séparé, l’écoulement de l’eau étant commandé par un ou
plusieurs robinets placés dans le circuit de sortie
NOTE 1 Un chauffe-eau à réservoir séparé est représenté à la Figure 101b.
NOTE 2 Le chauffe-eau peut être installé de telle façon que l’expansion de l’eau s’effectue dans le réservoir
d’alimentation
...

IEC 60335-2-21
Edition 5.2 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-21: Particular requirements for storage water heaters

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-21: Règles particulières pour les chauffe-eau à accumulation
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IEC 60335-2-21
Edition 5.2 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-21: Particular requirements for storage water heaters

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-21: Règles particulières pour les chauffe-eau à accumulation

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CJ
CODE PRIX
ICS 13.120; 91.140.65 ISBN 978-2-88910-144-3
– 2 – 60335-2-21 © IEC:2002+A1:2004
+A2:2008
CONTENTS
FOREWORD.3
INTRODUCTION.6

1 Scope.7
2 Normative references .7
3 Definitions .8
4 General requirement.9
5 General conditions for the tests .9
6 Classification.9
7 Marking and instructions.9
8 Protection against access to live parts.10
9 Starting of motor-operated appliances .10
10 Power input and current .11
11 Heating .11
12 Void.11
13 Leakage current and electric strength at operating temperature.11
14 Transient overvoltages .11
15 Moisture resistance .11
16 Leakage current and electric strength.11
17 Overload protection of transformers and associated circuits .11
18 Endurance.11
19 Abnormal operation .12
20 Stability and mechanical hazards .13
21 Mechanical strength .13
22 Construction .13
23 Internal wiring.15
24 Components .15
25 Supply connection and external flexible cords .16
26 Terminals for external conductors.17
27 Provision for earthing .17
28 Screws and connections .17
29 Clearances, creepage distances and solid insulation .17
30 Resistance to heat and fire.17
31 Resistance to rusting.17
32 Radiation, toxicity and similar hazards.17

Annexes .20
Annex A (informative) Routine tests .20

Bibliography.21

Figure 101 – Examples of types of storage water heaters .18
Figure 102 – Examples of positions of the thermocouples.19

60335-2-21 © IEC:2002+A1:2004 – 3 –
+A2:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
–––––––––––––
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-21: Particular requirements for storage water heaters

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This part of International Standard IEC 60335 has been prepared by IEC technical committee 61:
Safety of household and similar electrical appliances.
This consolidated version of IEC 60335-2-21 consists of the fifth edition (2002) [documents
61/2135/FDIS and 61/2160/RVD], its amendment 1 (2004) [documents 61/2683/FDIS and
61/2719/RVD] and its amendment 2 (2008) [documents 61/3678/FDIS and 61/3698/RVD].
The technical content is therefore identical to the base edition and its amendments and has
been prepared for user convenience.
It bears the edition number 5.2.
A vertical line in the margin shows where the base publication has been modified by
amendments 1 and 2.
The French version of this standard has not been voted upon.

– 4 – 60335-2-21 © IEC:2002+A1:2004
+A2:2008
This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments. It was established on the basis of the fourth edition (2001) of that standard.
NOTE 1 When “Part 1” is mentioned in this standard, it refers to IEC 60335-1.
This part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to
convert that publication into the IEC standard: Safety requirements for electric storage water
heaters.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies
as far as is reasonable. When this standard states "addition", "modification", or "replacement",
the relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The following differences exist in the countries indicated below.
– 6.1: Class 0I appliances are allowed (Japan).
– 6.2: IPX0 water heaters are allowed (France, Portugal, United Kingdom and USA).
– 7.1: Additional markings are required (Australia, New Zealand and South Africa).
– 7.1: The rated pressure is to be marked in pounds per square inch (USA).
– 7.1: Open outlet water heaters are not required to be marked with rated pressure (USA).
– 7.12.1: Additional instructions are required (South Africa).
– 11.7: The test is different (USA).
– 13.2: an additional leakage current test is required (China).
– 19.1: Water heaters that have all four features and are not liable to be emptied in normal
use are not subjected to the test of 19.101 (South Africa).
– 19.1: Appliances incorporating sheathed heating elements are not required to have an
outer enclosure of metal but their rated power input is limited to 12 kW (USA).
– 19.101: The test is different (USA).
– 22.101: Pressure reducing valves have to be designed for an inlet pressure of 2 MPa
(South Africa).
– 22.101: The minimum rated pressure is 1,0 MPa (Denmark, Finland, Norway and
Sweden).
– 22.102: The minimum pressure is 2,1 MPa. The test is not carried out on water heaters
having a capacity less than 2 l or on appliances having containers open to the atmosphere
(USA).
– 22.103: Closed water heaters have to incorporate a pressure-relief device (Norway).
– 22.103: Closed water heaters have to incorporate a pressure-relief device sensitive to
both pressure and temperature that operates before the water temperature reaches 99 °C
(Australia and New Zealand).
– 22.103: Closed water heaters having a capacity exceeding 50 l or a rated power input
exceeding 2 kW have to incorporate a pressure-relief device sensitive to both pressure
and temperature that operates before the water temperature reaches 99 °C (South Africa).

60335-2-21 © IEC:2002+A1:2004 – 5 –
+A2:2008
– 22.103: Closed water heaters have to incorporate a temperature relief valve or a combined
temperature and pressure-relief valve that operates before the water temperature reaches
100 °C (United Kingdom).
– 22.106: All water heaters have to incorporate a thermal cut-out (India).
– 22.106: The thermal cut-out of single-phase closed water heaters need only provide single-pole
disconnection (Japan).
– 22.106: For all closed water heaters, the thermal cut-out is to provide all-pole
disconnection (France, Netherlands, Norway and Switzerland).
– 22.109: A tool is not required for draining the appliance (Canada and USA).
– 22.110: Additional requirements apply to plastic or resin-based containers (South Africa).
– 22.112: The temperature limit is 95 °C (South Africa).
– 22.112: The temperature limit is 85 °C (USA).
– 24.101: Thermal cut-outs are required to have a trip-free switching mechanism (USA).
– 24.102: The maximum water temperature is 90 °C (Australia and New Zealand).
– 24.102: The maximum water temperature is 99 °C (Japan, Norway, Portugal, United
Kingdom and USA)
– 24.102: The temperature limit of 130 °C is only allowed for closed water heaters having a
rated pressure of at least 0,4 MPa (South Africa).
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE 4 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of the amendment 2 be adopted for implementation
nationally not earlier than 12 months or later than 36 months from the date of publication.

– 6 – 60335-2-21 © IEC:2002+A1:2004
+A2:2008
INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in
normal use taking into account the manufacturer's instructions. It also covers abnormal
situations that can be expected in practice and takes into account the way in which
electromagnetic phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that
there is compatibility with the wiring rules when the appliance is connected to the supply
mains. However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another part 2 of IEC 60335, the relevant part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
2 When a part 2 standard does not include additional requirements to cover hazards dealt with
in Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal and generic standards covering a hazard are not applicable since they have been taken into
consideration when developing the general and particular requirements for the IEC 60335 series of standards. For
example, in the case of temperature requirements for surfaces on many appliances, generic standards, such as
ISO 13732-1 for hot surfaces, are not applicable in addition to Part 1 or part 2 standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of
the requirements and, if found to be substantially equivalent, may be considered to comply
with the standard.
60335-2-21 © IEC:2002+A1:2004 – 7 –
+A2:2008
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-21: Particular requirements for storage water heaters

1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of electric storage water heaters for
household and similar purposes and intended for heating water below boiling temperature,
their rated voltage being not more than 250 V for single-phase appliances and 480 V for
other appliances.
Appliances not intended for normal household use but which nevertheless may be a source of
danger to the public, such as appliances intended to be used by laymen in shops, in light
industry and on farms, are within the scope of this standard.
As far as is practicable, this standard deals with the common hazards presented by
appliances that are encountered by all persons in and around the home. However, in general,
it does not take into account
– persons (including children) whose
• physical, sensory or mental capabilities; or
• lack of experience and knowledge
prevents them from using the appliance safely without supervision or instruction;
– children playing with the appliance.
NOTE 101 Attention is drawn to the fact that
– for appliances intended to be used at high altitudes, additional requirements may be necessary;
– for appliances intended to be used in vehicles or on board ships or aircraft, additional requirements may be
necessary;
– in many countries additional requirements are specified by the national health authorities, the national
authorities responsible for the protection of labour and similar authorities;
– in many countries regulations exist for the installation of equipment connected to the water mains.

NOTE 102 This standard does not apply to
– appliances for boiling water (IEC 60335-2-15);
– instantaneous water heaters (IEC 60335-2-35);
– commercial dispensing appliances and vending machines (IEC 60335-2-75);
– appliances intended exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the presence of a
corrosive or explosive atmosphere (dust, vapour or gas).
2 Normative references
This clause of Part 1 is applicable.

– 8 – 60335-2-21 © IEC:2002+A1:2004
+A2:2008
3 Definitions
This clause of Part 1 is applicable except as follows.
3.1.9 Replacement:
normal operation
operation of the appliance after installation in accordance with the instructions and filled with
cold water
3.101
storage water heater
stationary appliance for heating and storing water in a container and incorporating devices
to control the water temperature
3.102
closed water heater
unvented storage water heater intended to operate at the pressure of the water system, the
flow of water being controlled by one or more valves in the outlet system
NOTE 1 A closed water heater is shown in Figure 101a.
NOTE 2 The operating pressure may be the output pressure of a reducing or boosting device.
3.103
cistern-fed water heater
storage water heater that is vented to atmosphere and intended to be supplied by water
under gravity from a separate cistern, the flow of water being controlled by one or more
valves in the outlet system
NOTE 1 A cistern-fed water heater is shown in Figure 101b.
NOTE 2 The water heater may be installed so that the expanded water returns to the cistern.
NOTE 3 In a cistern-fed water heater, the pressure in the container results from the column of water in the
cistern.
3.104
cistern-type water heater
storage water heater having a container supplied by water under gravity from a cistern
incorporated in the appliance. The expanded water can return to the cistern, the flow of water
being controlled by one or more valves in the outlet system
NOTE 1 A cistern-type water heater is shown in Figure 101c.
NOTE 2 In a cistern-type water heater, the surface of the water is always at atmospheric pressure.
3.105
open-outlet water heater
storage water heater in which the flow of water is only controlled by a valve in the inlet pipe
and in which the expanded or displaced water flows through the outlet
NOTE 1 An open-outlet water heater is shown in Figure 101d.
NOTE 2 In an open-outlet water heater, the static pressure at the outlet is always at atmospheric pressure.

60335-2-21 © IEC:2002+A1:2004 – 9 –
+A2:2008
3.106
low-pressure water heater
storage water heater that is vented to atmosphere and intended to be connected to the water
mains through a pressure reducing valve, the flow of water being controlled by one or more
valves in the outlet system
NOTE A low-pressure water heater is shown in Figure 101e.
3.107
rated pressure
water pressure assigned to the appliance by the manufacturer
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.2 Addition:
NOTE 101 Additional appliances may be required if damage occurs during the tests of 19.2 or 19.3.
5.3 Addition:
When the tests are carried out on a single appliance, the tests of 22.102, 22.103, 22.112 and
24.102 are carried out before the tests of Clause 19.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Modification:
Water heaters shall be class I, class II or class III.
6.2 Addition:
Water heaters for installation outdoors shall be at least IPX4. Other water heaters shall be at
least IPX1.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances, other than cistern-type water heaters, shall be marked with the rated pressure
in pascals.
Appliances shall be marked with the rated capacity in litres.
Closed water heaters shall be marked with a statement that a pressure-relief device is to be
fitted in the installation, unless it is incorporated in the appliance.

– 10 – 60335-2-21 © IEC:2002+A1:2004
+A2:2008
Closed water heaters having a rated pressure less than 0,6 MPa and low-pressure water
heaters shall be marked with a statement that a pressure reducing valve is to be fitted in the
installation.
Open-outlet water heaters shall be marked, close to the outlet connection or on a tag
attached to the appliance, with the substance of the following:
WARNING: This outlet acts as a vent and must only be connected to a fitting
recommended by the manufacturer. It must not be connected to a tap.
7.12 Addition:
The instructions for closed water heaters shall state the substance of the following:
– the water may drip from the discharge pipe of the pressure-relief device and that this pipe
must be left open to the atmosphere;
– the pressure-relief device is to be operated regularly to remove lime deposits and to verify
that it is not blocked;
– how the water heater can be drained.
7.12.1 Addition:
The installation instructions shall state the substance of the following:
– the type or characteristics of the pressure-relief device and how to connect it, unless it is
incorporated in the appliance;
– a discharge pipe connected to the pressure-relief device is to be installed in a
continuously downward direction and in a frost-free environment;
– the type or characteristics of a pressure reducing valve and the installation details (for
appliances having a rated pressure less than 0,6 MPa).
The instructions for closed water heaters incorporating a heat exchanger shall give details
on the installation of control devices and the temperature settings that are necessary to
prevent operation of the thermal cut-out caused by the heat from the exchanger.
The instructions for cistern-fed water heaters and low-pressure water heaters shall contain
the substance of the following:

WARNING: Do not connect any pressure-relief device to the vent pipe of this water
heater.
7.101 The water inlet and the water outlet shall be identified. This identification shall not be
on detachable parts. If colours are used, blue shall be used for the inlet and red for the
outlet.
NOTE Identification may be by means of arrows showing the direction of the water flow.
Compliance is checked by inspection.
8 Protection against access to live parts
This clause of Part 1 is applicable.
9 Starting of motor-operated appliances
This clause of Part 1 is not applicable.

60335-2-21 © IEC:2002+A1:2004 – 11 –
+A2:2008
10 Power input and current
This clause of Part 1 is applicable.
11 Heating
This clause of Part 1 is applicable except as follows.
11.7 Replacement:
The appliance is operated until steady conditions are established or until the thermostat
interrupts the current for the first time after 16 h, whichever is shorter.
12 Void
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable.
14 Transient overvoltages
This clause of Part 1 is applicable.
15 Moisture resistance
This clause of Part 1 is applicable except as follows.
15.2 Addition:
The test is only applicable to cistern-type water heaters.
15.3 Addition:
NOTE 101 If the appliance is too large for the humidity cabinet, the test may be carried out on those parts that
contain electrical components.
16 Leakage current and electric strength
This clause of Part 1 is applicable.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.
18 Endurance
This clause of Part 1 is not applicable.

– 12 – 60335-2-21 © IEC:2002+A1:2004
+A2:2008
19 Abnormal operation
This clause of Part 1 is applicable except as follows.
19.1 Modification:
Instead of the tests specified for appliances incorporating heating elements, the following
applies.
For closed water heaters, low-pressure water heaters and open-outlet water heaters,
compliance is checked by the tests of 19.2, 19.3 and 19.4 if applicable. However, 19.101
applies instead for appliances not liable to be emptied in normal use and having all four of the
following features:
– an outer enclosure of metal;
NOTE 101 Non-metallic covers may be used for the supply terminals and controls.
– non-combustible thermal insulation;
NOTE 102 Insulation withstanding the needle flame test of Annex E is considered to be non-combustible.
– a capacity exceeding 30 l;
– a rated power input not exceeding 6 kW.
NOTE 103 Appliances are not considered liable to be emptied in normal use if emptying through the inlet is
prevented by a check valve, a pipe interrupter or an air gap. These devices may be fitted in the inlet pipe in
accordance with the instructions. Emptying through openings provided for servicing purposes only is not
considered to be normal use.
NOTE 104 Cistern-fed water heaters and cistern-type water heaters are not subjected to the tests.
19.2 Addition:
The appliance is operated empty, any thermal control that operates during the test of
Clause 11 being short-circuited.
NOTE 101 If the appliance is provided with more than one thermal control, these are short-circuited in turn.
19.3 Addition:
NOTE 101 If the water heater has been damaged during the previous test, a new appliance is used.
19.4 Replacement:
For open-outlet water heaters, the test of 19.2 is repeated but with the container filled with
water to a level at least 10 mm above the highest point of the heating element. The appliance
is operated at 1,15 times rated power input under normal operation.
NOTE 101 If the water heater has been damaged during previous tests, a new appliance is used.
19.13 Addition:
There shall be no leakage from the container during the tests.
19.101 The appliance is tested for 24 h under the conditions specified in Clause 11 but with
the container empty.
60335-2-21 © IEC:2002+A1:2004 – 13 –
+A2:2008
20 Stability and mechanical hazards
This clause of Part 1 is applicable.
21 Mechanical strength
This clause of Part 1 is applicable.
22 Construction
This clause of Part 1 is applicable except as follows.
22.6 Addition:
The enclosure shall have a drain hole positioned so that the water can drain without impairing
electrical insulation, unless condensed water cannot accumulate within the enclosure in
normal use. The hole shall be at least 5 mm in diameter or 20 mm in area with a width of at
least 3 mm.
Compliance is checked by inspection and measurement.
22.20 Addition:
Thermal insulation shall not be used for basic insulation of internal wiring.
22.47 Replacement:
Appliances shall withstand the water pressure occurring in normal use.
Compliance is checked by subjecting the appliance to a water pressure of
– twice the rated pressure, for closed water heaters. If the water heater is supplied
through a pressure reducing valve, the container is subjected to twice the working pressure
instead;
NOTE 1 The pressure reducing valve may be incorporated in the water-inlet pipe.
NOTE 2 The working pressure is the maximum pressure in the container measured during the test of Clause 11.
– 1,5 times rated pressure, for cistern-fed water heaters and low-pressure water
heaters;
– 0,15 MPa, for open-outlet water heaters;
– 0,03 MPa, for cistern-type water heaters.
Pressure-relief devices are rendered inoperative. The pressure is raised at a rate of
0,13 MPa/s to the specified value and is maintained at that value for 15 min.
Water shall not leak from the appliance and there shall be no permanent deformation to such
an extent that compliance with this standard is impaired.
NOTE 3 Heat exchangers incorporated in an appliance are subjected to a pressure test based on their working
pressure.
NOTE 4 Damage to a protective coating on the inside of containers is not considered to be a hazard.

– 14 – 60335-2-21 © IEC:2002+A1:2004
+A2:2008
22.101 The rated pressure of closed water heaters intended for direct connection to the
water main shall be at least 0,6 MPa.
The rated pressure of closed water heaters and low-pressure water heaters, intended to
be supplied by a pressure reducing valve that is not incorporated in the appliance, shall be at
least 0,1 MPa.
The rated pressure of cistern-fed water heaters shall not exceed 0,2 MPa.
NOTE The rated pressure of open-outlet water heaters is 0 Pa.
Compliance is checked by inspection.
22.102 Void
22.103 Pressure-relief devices of closed water heaters shall prevent the pressure in the
container from exceeding the rated pressure by more than 0,1 MPa.
Compliance is checked by subjecting the container to a slowly increasing water pressure.
NOTE The pressure-relief device may be fitted during installation.
22.104 The outlet of open-outlet water heaters shall be constructed so that the water flow
is not limited to such an extent that the container is subjected to a significant pressure.
NOTE This requirement is considered to be met if the cross-sectional area of the water outlet is not less than that
of the inlet.
The vent pipe of low pressure water heaters shall have an internal diameter of at least
20 mm.
Compliance is checked by inspection and measurement.
22.105 Cistern-type water heaters shall be constructed so that the container is always at
atmospheric pressure by means of a vent having an area of at least 30 mm and a minimum
dimension of at least 3 mm.
Compliance is checked by inspection and by measurement.
22.106 Closed water heaters shall incorporate a thermal cut-out providing all-pole
disconnection and which operates independently from the thermostat. However, for
appliances intended to be connected to fixed wiring, the neutral conductor need not be
disconnected.
Compliance is checked by inspection.
22.107 Heating elements and thermal control sensors in contact with the outer surface of the
container shall be held in position securely.
Compliance is checked by inspection.

60335-2-21 © IEC:2002+A1:2004 – 15 –
+A2:2008
22.108 Appliances for wall mounting shall have reliable provision for fixing to a wall,
independent of the connection to the water mains.
Compliance is checked by inspection.
22.109 Appliances having a capacity of more than 15 l that cannot be emptied through a
drain fitted in the water pipes shall incorporate means for draining that requires a tool for its
operation.
Compliance is checked by inspection and by manual test.
NOTE 1 Residual water in the container below the end of the inlet pipe is disregarded.
NOTE 2 The means for draining may be combined with a pressure-relief valve.
22.110 Open-outlet water heaters having plastic containers shall be constructed to ensure
that the appliance is only likely to be installed in the intended orientation.
NOTE Appliances marked with the mounting position adjacent to the water connections are considered to meet
this requirement.
Compliance is checked by inspection.
22.111 Closed water heaters incorporating a heat exchanger shall be constructed so that
during normal use the thermal cut-out does not operate due to heat from the exchanger.
Thermostatic valves, by-pass valves and similar controlling devices used for this purpose
shall be supplied with the appliance.
Compliance is checked by inspection.
22.112 Closed water heaters shall be constructed so that repeated drawing off does not
cause the water to boil.
Compliance is checked by the following test.
The appliance is operated as specified in Clause 11.
When the thermostat has operated for the first time, water is drawn off at a rate of
approximately 2 l/min or 10 % of the capacity of the appliance per minute, whichever is less,
until the thermostat switches on again.
When the thermostat next operates, water is drawn off again at the same rate until the
thermostat switches on, this sequence being repeated until steady conditions are
established.
The temperature of the water, measured by means of a thermocouple at the outlet, shall not
exceed 98 °C.
23 Internal wiring
This clause of Part 1 is applicable.
24 Components
This clause of Part 1 is applicable except as follows.

– 16 – 60335-2-21 © IEC:2002+A1:2004
+A2:2008
24.1.4 Addition:
Thermal cut-outs incorporated in closed water heaters shall comply with the requirements
for type 2B controls in Clauses 13, 15, 16 17 and 20 of IEC 60730-1, unless they are tested
with the appliance.
24.101 Thermal cut-outs shall be non-self-resetting. They shall have a trip-free switching
mechanism or be located so that they can only be reset after removal of a non-detachable
cover.
Compliance is checked by inspection.
24.102 The operating temperature of the thermal cut-out of a closed water heater shall
ensure that the water temperature cannot exceed 99 °C or that the thermal cut-out operates
before its temperature exceeds 110 °C.
Compliance is checked by the test of 24.102.1 for water temperatures not exceeding 99 °C or
by the test of 24.102.2 for thermal cut-outs having an operating temperature up to 110 °C.
24.102.1 The appliance is operated under the conditions specified in Clause 11 until the
thermostat operates for the first time. A quantity of water equal to 25 % of the capacity of the
container is then drawn off so that it is replaced by cold water.
Immediately after the thermostat operates for the second time, it is short-circuited. The test
is continued until the thermal cut-out operates. The outlet valve is then opened and the
temperature of the water measured at the outlet.
The temperature shall not exceed 99 °C.
24.102.2 The operating temperature of the thermal cut-out is measured by means of a
thermocouple positioned on its sensing element or as close as possible to it.
The water temperature for appliances having vertically oriented metallic water containers is
measured by a thermocouple attached to the outer surface of the upper dome. If the water
container is horizontally oriented, two thermocouples are attached to the outer surface. The
position of the thermocouple is shown in Figure 102a.
The water temperature for appliances having non-metallic water containers is measured by a
thermocouple positioned 50 mm below the upper inner surface of the container, as shown in
one of the diagrams of Figure 102b. This method may also be used to measure the water
temperature of appliances having vertically oriented metallic water containers.
The appliance is operated at 1,15 times rated power input under normal operation with the
outlet valve closed and thermostats short-circuited. The test is continued until the thermal
cut-out operates.
The thermal cut-out shall operate before its temperature exceeds 110 °C. The water
temperature shall not exceed 20 K of the maximum permitted operating temperature of the
thermal cut-out.
25 Supply connection and external flexible cords
This clause of Part 1 is applicable except as follows.

60335-2-21 © IEC:2002+A1:2004 – 17 –
+A2:2008
25.1 Modification:
Appliances shall not incorporate an appliance inlet.
26 Terminals for external conductors
This clause of Part 1 is applicable.
27 Provision for earthing
This clause of Part 1 is applicable except as f
...

IEC 60335-2-21
Edition 5.1 2004-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-21: Particular requirements for storage water heaters

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-21: Règles particulières pour les chauffe-eau à accumulation

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IEC 60335-2-21
Edition 5.1 2004-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-21: Particular requirements for storage water heaters

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-21: Règles particulières pour les chauffe-eau à accumulation

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CH
CODE PRIX
ICS 91.140.65; 13.120 ISBN 2-8318-7645-1

– 2 – 60335-2-21 © CEI:2002+A1:2004

SOMMAIRE
AVANT-PROPOS.4

INTRODUCTION.10

1 Domaine d’application .12

2 Références normatives.12

3 Définitions .14

4 Exigences générales .16

5 Conditions générales d’essais .16
6 Classification.16
7 Marquage et instructions .16
8 Protection contre l’accès aux parties actives .18
9 Démarrage des appareils à moteur.20
10 Puissance et courant .20
11 Echauffements.20
12 Vacant.20
13 Courant de fuite et rigidité diélectrique à la température de régime .20
14 Surtensions transitoires.20
15 Résistance à l’humidité.20
16 Courant de fuite et rigidité diélectrique .20
17 Protection contre la surcharge des transformateurs et des circuits associés.20
18 Endurance.22
19 Fonctionnement anormal.22
20 Stabilité et dangers mécaniques .24
21 Résistance mécanique.24
22 Construction.24
23 Conducteurs internes .28
24 Composants.28
25 Raccordement au réseau et câbles souples extérieurs .30
26 Bornes pour conducteurs externes .32
27 Dispositions en vue de la mise à la terre .32
28 Vis et connexions.32
29 Distances dans l’air, lignes de fuite et isolation solide .32
30 Résistance à la chaleur et au feu.32
31 Protection contre la rouille.32
32 Rayonnement, toxicité et dangers analogues.32

Annexes .38
Annexe A (informative) Essais de série.38

Bibliographie.40

Figure 101 – Exemples de types de chauffe-eau à accumulation .34
Figure 102 – Exemples de positions des thermocouples .36

60335-2-21 © IEC:2002+A1:2004 – 3 –

CONTENTS
FOREWORD.5

INTRODUCTION.11

1 Scope.13

2 Normative references .13

3 Definitions .15

4 General requirement.17
5 General conditions for the tests .17
6 Classification.17
7 Marking and instructions.17
8 Protection against access to live parts.19
9 Starting of motor-operated appliances .21
10 Power input and current .21
11 Heating .21
12 Void.21
13 Leakage current and electric strength at operating temperature.21
14 Transient overvoltages .21
15 Moisture resistance .21
16 Leakage current and electric strength.21
17 Overload protection of transformers and associated circuits .21
18 Endurance.23
19 Abnormal operation .23
20 Stability and mechanical hazards .25
21 Mechanical strength .25
22 Construction .25
23 Internal wiring.29
24 Components .29
25 Supply connection and external flexible cords .31
26 Terminals for external conductors.33
27 Provision for earthing .33

28 Screws and connections .33
29 Clearances, creepage distances and solid insulation .33
30 Resistance to heat and fire.33
31 Resistance to rusting.33
32 Radiation, toxicity and similar hazards.33

Annexes .39
Annex A (informative) Routine tests .39

Bibliography.41

Figure 101 – Examples of types of storage water heaters .35
Figure 102 – Examples of positions of the thermocouples.37

– 4 – 60335-2-21 © CEI:2002+A1:2004

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE

–––––––––––
APPAREILS ÉLECTRODOMESTIQUES ET ANALOGUES –

SÉCURITÉ –
Partie 2-21: Règles particulières pour

les chauffe-eau à accumulation

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a
pour objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les
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organisations internationales, gouvernementales et non gouvernementales, en liaison avec la CEI, participent
également aux travaux. La CEI collabore étroitement avec l'Organisation Internationale de Normalisation (ISO),
selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
du possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de la CEI
intéressés sont représentés dans chaque comité d’études.
3) Les Publications de la CEI se présentent sous la forme de recommandations internationales et sont agréées
comme telles par les Comités nationaux de la CEI. Tous les efforts raisonnables sont entrepris afin que la CEI
s'assure de l'exactitude du contenu technique de ses publications; la CEI ne peut pas être tenue responsable
de l'éventuelle mauvaise utilisation ou interprétation qui en est faite par un quelconque utilisateur final.
4) Dans le but d'encourager l'uniformité internationale, les Comités nationaux de la CEI s'engagent, dans toute la
mesure possible, à appliquer de façon transparente les Publications de la CEI dans leurs publications
nationales et régionales. Toutes divergences entre toutes Publications de la CEI et toutes publications
nationales ou régionales correspondantes doivent être indiquées en termes clairs dans ces dernières.
5) La CEI n’a prévu aucune procédure de marquage valant indication d’approbation et n'engage pas sa
responsabilité pour les équipements déclarés conformes à une de ses Publications.
6) Tous les utilisateurs doivent s'assurer qu'ils sont en possession de la dernière édition de cette publication.
7) Aucune responsabilité ne doit être imputée à la CEI, à ses administrateurs, employés, auxiliaires ou
mandataires, y compris ses experts particuliers et les membres de ses comités d'études et des Comités
nationaux de la CEI, pour tout préjudice causé en cas de dommages corporels et matériels, ou de tout autre
dommage de quelque nature que ce soit, directe ou indirecte, ou pour supporter les coûts (y compris les frais
de justice) et les dépenses découlant de la publication ou de l'utilisation de cette Publication de la CEI ou de
toute autre Publication de la CEI, ou au crédit qui lui est accordé.
8) L'attention est attirée sur les références normatives citées dans cette publication. L'utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L’attention est attirée sur le fait que certains des éléments de la présente Publication de la CEI peuvent faire

l’objet de droits de propriété intellectuelle ou de droits analogues. La CEI ne saurait être tenue pour
responsable de ne pas avoir identifié de tels droits de propriété et de ne pas avoir signalé leur existence.

La présente partie de la Norme internationale CEI 60335 a été établie par le comité
d’études 61 de la CEI: Sécurité des appareils électrodomestiques et analogues.
La présente version consolidée de la CEI 60335-2-21 comprend la cinquième édition (2002)
et son amendement 1 (2004) [documents 61/2683/FDIS et 61/2719/RVD].
Le contenu technique de cette version consolidée est donc identique à celui de l'édition de
base et à son amendement; cette version a été préparée par commodité pour l'utilisateur.
Elle porte le numéro d'édition 5.1.
Une ligne verticale dans la marge indique où la publication de base a été modifiée par
l'amendement 1.
La version française de cette norme n’a pas été soumise au vote.

60335-2-21 © IEC:2002+A1:2004 – 5 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION

–––––––––––––
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –

SAFETY –
Part 2-21: Particular requirements for storage water heaters

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

This part of International Standard IEC 60335 has been prepared by IEC technical committee 61:
Safety of household and similar electrical appliances.
This consolidated version of IEC 60335-2-21 consists of the fifth edition (2002) [documents
61/2135/FDIS and 61/2160/RVD] and its amendment 1 (2004) [documents 61/2683/FDIS and
61/2719/RVD].
The technical content is therefore identical to the base edition and its amendment and has
been prepared for user convenience.
It bears the edition number 5.1.
A vertical line in the margin shows where the base publication has been modified by
amendment 1.
The French version of this standard has not been voted upon.

– 6 – 60335-2-21 © CEI:2002+A1:2004

La présente partie 2 doit être utilisée conjointement avec la dernière édition de la CEI 60335-1 et
ses amendements. Elle a été établie sur la base de la quatrième édition (2001) de cette norme.

NOTE 1 L’expression «Partie 1» utilisée dans la présente norme fait référence à la CEI 60335-1.

La présente partie 2 complète ou modifie les articles correspondants de la CEI 60335-1 de
façon à transformer cette publication en norme CEI: Règles de sécurité pour les chauffe-eau
électriques à accumulation.
Lorsqu'un paragraphe particulier de la Partie 1 n'est pas mentionné dans cette partie 2, ce

paragraphe s'applique pour autant qu'il est raisonnable. Lorsque la présente norme spécifie

«addition», «modification» ou «remplacement», le texte correspondant de la Partie 1 doit être

adapté en conséquence.
NOTE 2 Le système de numérotation suivant est utilisé:
– paragraphes, tableaux et figures: ceux qui sont numérotés à partir de 101 sont complémentaires à ceux de la
Partie 1;
– notes: à l’exception de celles qui sont dans un nouveau paragraphe ou de celles qui concernent des notes de
la Partie 1, les notes sont numérotées à partir de 101, y compris celles des articles ou paragraphes qui sont
modifiés ou remplacés;
– les annexes supplémentaires sont appelées AA, BB, etc.
NOTE 3 Les caractères d'imprimerie suivants sont utilisés:
– prescriptions: caractères romains;
– modalités d'essais: caractères italiques;
– notes: petits caractères romains.
Les mots en gras dans le texte sont définis à l'Article 3. Lorsqu'une définition concerne un adjectif, l'adjectif et le
nom associé figurent également en gras.
Le comité a décidé que le contenu de la publication de base et de ses amendements ne sera
pas modifié avant la date de maintenance indiquée sur le site web de la CEI sous
"http://webstore.iec.ch" dans les données relatives à la publication recherchée. A cette date,
la publication sera
• reconduite,
• supprimée,
• remplacée par une édition révisée, ou
• amendée.
Les différences suivantes existent dans les pays indiqués ci-après.
– 6.1: Les appareils de la classe 0I sont autorisés (Japon ).
– 6.2: Les chauffe-eau IPX0 sont autorisés (France, Portugal, Royaume-Uni et USA).

– 7.1: Les marquages complémentaires sont prescrits (Afrique du Sud, Australie et Nouvelle
Zélande).
– 7.1: La pression assignée doit être marquée en livres par pouce carré (USA).
– 7.1: Le marquage de la pression assignée n’est pas requis pour les chauffe-eau à
écoulement libre (USA).
– 7.12.1: Des instructions supplémentaires sont requises (Afrique du Sud).
– 11.7: L’essai est différent (USA).
– 19.1: Les chauffe-eau qui comportent les quatre caractéristiques mentionnées et ne sont
pas susceptibles d’être vidés en usage normal ne sont pas soumis à l’essai de 19.101
(Afrique du Sud).
– 19.1: Les appareils comportant des éléments chauffants blindés ne doivent pas
nécessairement comporter d’enveloppe extérieure en métal mais leur puissance assignée
est limitée à 12 kW (USA).
– 19.101: L’essai est différent (USA).

60335-2-21 © IEC:2002+A1:2004 – 7 –

This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments. It was established on the basis of the fourth edition (2001) of that standard.

NOTE 1 When “Part 1” is mentioned in this standard, it refers to IEC 60335-1.

This part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to
convert that publication into the IEC standard: Safety requirements for electric storage water
heaters.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies
as far as is reasonable. When this standard states "addition", "modification", or "replacement",

the relevant text in Part 1 is to be adapted accordingly.

NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The following differences exist in the countries indicated below.
– 6.1: Class 0I appliances are allowed (Japan).
– 6.2: IPX0 water heaters are allowed (France, Portugal, United Kingdom and USA).
– 7.1: Additional markings are required (Australia, New Zealand and South Africa).

– 7.1: The rated pressure is to be marked in pounds per square inch (USA).
– 7.1: Open outlet water heaters are not required to be marked with rated pressure (USA).
– 7.12.1: Additional instructions are required (South Africa).
– 11.7: The test is different (USA).
– 19.1: Water heaters that have all four features and are not liable to be emptied in normal
use are not subjected to the test of 19.101 (South Africa).
– 19.1: Appliances incorporating sheathed heating elements are not required to have an
outer enclosure of metal but their rated power input is limited to 12 kW (USA).
– 19.101: The test is different (USA).

– 8 – 60335-2-21 © CEI:2002+A1:2004

– 22.101: Les dispositifs réducteurs de pression doivent être construits pour une pression à

l’entrée de 2 MPa (Afrique du Sud).

– 22.101: La pression assignée minimale est de 1,0 MPa (Danemark, Finlande, Norvège et

Suède).
– 22.102: La pression minimale est de 2,1 MPa. L’essai n’est ni effectué sur les chauffe-eau
dont la capacité est inférieure à 2 l ni sur les appareils comportant des cuves ouvertes à

l’air libre (USA).
– 22.103: Les chauffe-eau fermés doivent comporter un dispositif limiteur de pression

(Norvège).
– 22.103: Les chauffe-eau fermés doivent comporter un dispositif limiteur de pression

sensible à la fois à la pression et à la température qui fonctionne avant que la température
de l’eau n’atteigne 99 °C (Australie et Nouvelle Zélande).
– 22.103: Les chauffe-eau fermés dont la capacité excède 50 l ou la puissance assignée
2 kW doivent comporter un dispositif limiteur de pression, sensible à la fois à la pression
et à la température, qui fonctionne avant que la température de l’eau n’atteigne 99 °C
(Afrique du Sud).
– 22.103: Les chauffe-eau fermés doivent comporter un dispositif limiteur de pression
sensible à la température ou un dispositif sensible à la fois à la pression et à la
température qui fonctionne avant que la température de l'eau n’atteigne 100 °C (Royaume
Uni).
– 22.106: Tous les chauffe-eau doivent comporter un coupe-circuit thermique (Inde).
– 22.106: Le coupe-circuit thermique des chauffe-eau fermés monophasés peut n’assurer qu’une
coupure omnipolaire (Japon).
– 22.106: Pour tous les chauffe-eau fermés, le coupe-circuit thermique doit assurer une
coupure omnipolaire (France, Pays-Bas, Norvège et Suisse).
– 22.109: L’utilisation d’un outil pour vidanger l’appareil n’est pas exigée (Canada et USA).
– 22.110: Les cuves en matière plastique ou à base de résine sont soumises à des
prescriptions complémentaires (Afrique du Sud).
– 22.112: La limite de température est de 95 °C (Afrique du Sud).
– 22.112: La limite de température est de 85 °C (USA).
– 24.101: Les coupe-circuit thermiques doivent avoir un mécanisme interrupteur à
déclenchement libre (USA).
– 24.102: La température maximale de l’eau est de 90 °C (Australie et Nouvelle Zélande).
– 24.102: La température maximale de l’eau est de 99 °C (Japon, Norvège, Portugal,
Royaume-Uni et USA)
– 24.102: La limite de température de 130 °C n’est autorisée que pour des chauffe-eau
fermés dont la pression assignée est au moins égale à 0,4 MPa (Afrique du Sud).

60335-2-21 © IEC:2002+A1:2004 – 9 –

– 22.101: Pressure reducing valves have to be designed for an inlet pressure of 2 MPa

(South Africa).
– 22.101: The minimum rated pressure is 1,0 MPa (Denmark, Finland, Norway and

Sweden).
– 22.102: The minimum pressure is 2,1 MPa. The test is not carried out on water heaters
having a capacity less than 2 l or on appliances having containers open to the atmosphere

(USA).
– 22.103: Closed water heaters have to incorporate a pressure-relief device (Norway).

– 22.103: Closed water heaters have to incorporate a pressure-relief device sensitive to

both pressure and temperature that operates before the water temperature reaches 99 °C

(Australia and New Zealand).
– 22.103: Closed water heaters having a capacity exceeding 50 l or a rated power input
exceeding 2 kW have to incorporate a pressure-relief device sensitive to both pressure
and temperature that operates before the water temperature reaches 99 °C (South Africa).
– 22.103: Closed water heaters have to incorporate a temperature relief valve or a combined
temperature and pressure-relief valve that operates before the water temperature reaches
100 °C (United Kingdom).
– 22.106: All water heaters have to incorporate a thermal cut-out (India).
– 22.106: The thermal cut-out of single-phase closed water heaters need only provide single-pole
disconnection (Japan).
– 22.106: For all closed water heaters, the thermal cut-out is to provide all-pole
disconnection (France, Netherlands, Norway and Switzerland).
– 22.109: A tool is not required for draining the appliance (Canada and USA).
– 22.110: Additional requirements apply to plastic or resin-based containers (South Africa).
– 22.112: The temperature limit is 95 °C (South Africa).
– 22.112: The temperature limit is 85 °C (USA).
– 24.101: Thermal cut-outs are required to have a trip-free switching mechanism (USA).
– 24.102: The maximum water temperature is 90 °C (Australia and New Zealand).
– 24.102: The maximum water temperature is 99 °C (Japan, Norway, Portugal, United
Kingdom and USA)
– 24.102: The temperature limit of 130 °C is only allowed for closed water heaters having a
rated pressure of at least 0,4 MPa (South Africa).

– 10 – 60335-2-21 © CEI:2002+A1:2004

INTRODUCTION
Il a été considéré en établissant la présente Norme internationale que l'exécution de ses dis-

positions était confiée à des personnes expérimentées et ayant une qualification appropriée.

Cette norme reconnaît le niveau de protection internationalement accepté contre les risques

électriques, mécaniques, thermiques, liés au feu et au rayonnement des appareils, lorsqu'ils

fonctionnent comme en usage normal en tenant compte des instructions du fabricant. Elle

couvre également les situations anormales auxquelles on peut s'attendre dans la pratique et

prend en considération les phénomènes électromagnétiques qui peuvent affecter le

fonctionnement en toute sécurité des appareils.

Cette norme tient compte autant que possible des prescriptions de la CEI 60364, de façon à
rester compatible avec les règles d'installation quand l’appareil est raccordé au réseau
d’alimentation. Cependant, des règles nationales d'installation peuvent être différentes.
Si un appareil compris dans le domaine d’application de cette norme comporte également des
fonctions qui sont couvertes par une autre partie 2 de la CEI 60335, la partie 2 corres-
pondante est appliquée à chaque fonction séparément, dans la limite du raisonnable. Si cela
est applicable, on tient compte de l’influence d’une fonction sur les autres fonctions.
Cette norme est une norme de famille de produits traitant de la sécurité d’appareils et a
préséance sur les normes horizontales et génériques couvrant le même sujet.
Un appareil conforme au texte de la présente norme ne sera pas nécessairement jugé
conforme aux principes de sécurité de la norme si, lorsqu'il est examiné et soumis aux essais,
il apparaît qu'il présente d'autres caractéristiques qui compromettent le niveau de sécurité
visé par ces prescriptions.
Un appareil utilisant des matériaux ou présentant des modes de construction différents de
ceux décrits dans les prescriptions de cette norme peut être examiné et essayé en fonction
de l'objectif poursuivi par ces prescriptions et, s'il est jugé pratiquement équivalent, il peut
être estimé conforme aux principes de sécurité de la norme.

60335-2-21 © IEC:2002+A1:2004 – 11 –

INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its

provisions is entrusted to appropriately qualified and experienced persons.

This standard recognizes the internationally accepted level of protection against hazards such

as electrical, mechanical, thermal, fire and radiation of appliances when operated as in

normal use taking into account the manufacturer's instructions. It also covers abnormal

situations that can be expected in practice and takes into account the way in which

electromagnetic phenomena can affect the safe operation of appliances.

It also covers abnormal situations that can be expected in practice.
This standard takes into account the requirements of IEC 60364 as far as possible so that
there is compatibility with the wiring rules when the appliance is connected to the supply
mains. However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another part 2 of IEC 60335, the relevant part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of
the requirements and, if found to be substantially equivalent, may be considered to comply
with the standard.
– 12 – 60335-2-21 © CEI:2002+A1:2004

APPAREILS ÉLECTRODOMESTIQUES ET ANALOGUES –

SÉCURITÉ –
Partie 2-21: Règles particulières pour

les chauffe-eau à accumulation

1 Domaine d’application
L’article de la Partie 1 est remplacé par l’article ci-après.
La présente Norme internationale traite de la sécurité des chauffe-eau à accumulation pour
usages domestiques et analogues destinés à chauffer l’eau à une température inférieure à la
température d’ébullition dont la tension assignée n'est pas supérieure à 250 V pour les
appareils monophasés et à 480 V pour les autres appareils.
Les appareils qui ne sont pas destinés à un usage domestique normal mais qui peuvent
néanmoins constituer une source de danger pour le public, tels que les appareils destinés à
être utilisés par des usagers non avertis dans des magasins, chez des artisans et dans des
fermes, sont compris dans le domaine d'application de la présente norme.
Dans la mesure du possible, la présente norme traite des risques ordinaires présentés par les
appareils, encourus par tous les individus à l'intérieur et autour de l'habitation. Cependant,
cette norme ne tient pas compte en général
– de l'utilisation des appareils par de jeunes enfants ou par des personnes handicapées,
sans surveillance;
– de l’emploi de l’appareil comme jouet par de jeunes enfants.
NOTE 101 L’attention est attirée sur le fait que:
– pour les appareils destinés à être utilisés à haute altitude, des prescriptions supplémentaires peuvent être
nécessaires;
– pour les appareils destinés à être utilisés dans des véhicules ou à bord de navires ou d’avions, des
prescriptions supplémentaires peuvent être nécessaires;
– dans de nombreux pays, des prescriptions supplémentaires sont spécifiées par les organismes nationaux de la
santé, par les organismes nationaux responsables de la protection des travailleurs et par des organismes
similaires;
– dans de nombreux pays, des réglementations existent pour l'installation des équipements raccordés au réseau
d'alimentation en eau.
NOTE 102 La présente norme ne s’applique pas:

– aux appareils pour faire bouillir l'eau (CEI 60335-2-15);
– aux chauffe-eau instantanés (CEI 60335-2-35);
– aux distributeurs commerciaux avec ou sans moyens de paiement (CEI 60335-2-75);
– aux appareils destinés exclusivement aux usages industriels;
– aux appareils destinés à être utilisés dans des locaux présentant des conditions particulières, telle que la
présence d'une atmosphère corrosive ou explosive (poussière, vapeur ou gaz).
2 Références normatives
L’article de la Partie 1 est applicable.

60335-2-21 © IEC:2002+A1:2004 – 13 –

HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –

SAFETY –
Part 2-21: Particular requirements for storage water heaters

1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of electric storage water heaters for
household and similar purposes and intended for heating water below boiling temperature,
their rated voltage being not more than 250 V for single-phase appliances and 480 V for
other appliances.
Appliances not intended for normal household use but which nevertheless may be a source of
danger to the public, such as appliances intended to be used by laymen in shops, in light
industry and on farms, are within the scope of this standard.
As far as is practicable, this standard deals with the common hazards presented by
appliances that are encountered by all persons in and around the home. However, in general,
it does not take into account
– the use of appliances by young children or infirm persons without supervision;
– playing with the appliance by young children.

NOTE 101 Attention is drawn to the fact that
– for appliances intended to be used at high altitudes, additional requirements may be necessary;
– for appliances intended to be used in vehicles or on board ships or aircraft, additional requirements may be
necessary;
– in many countries additional requirements are specified by the national health authorities, the national
authorities responsible for the protection of labour and similar authorities;
– in many countries regulations exist for the installation of equipment connected to the water mains.

NOTE 102 This standard does not apply to
– appliances for boiling water (IEC 60335-2-15);
– instantaneous water heaters (IEC 60335-2-35);

– commercial dispensing appliances and vending machines (IEC 60335-2-75);
– appliances intended exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the presence of a
corrosive or explosive atmosphere (dust, vapour or gas).
2 Normative references
This clause of Part 1 is applicable.

– 14 – 60335-2-21 © CEI:2002+A1:2004

3 Définitions
L’article de la Partie 1 est applicable avec les exceptions suivantes.

3.1.9 Remplacement:
conditions de fonctionnement normal

fonctionnement de l’appareil après installation conformément aux instructions et rempli d’eau

froide
...