IEC 63159-2-2:2021

IEC 63159-2-2 ®
Edition 1.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household electric instantaneous water heaters – Methods for measuring the
performance –
Part 2-2: Efficiency of single point of use electric instantaneous water heaters

Chauffe-eau instantanés électrodomestiques – Méthodes de mesure de
l'aptitude à la fonction –
Partie 2-2: Rendement des chauffe-eau instantanés électriques à un seul point
d'utilisation
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IEC 63159-2-2 ®
Edition 1.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household electric instantaneous water heaters – Methods for measuring the

performance –
Part 2-2: Efficiency of single point of use electric instantaneous water heaters

Chauffe-eau instantanés électrodomestiques – Méthodes de mesure de

l'aptitude à la fonction –
Partie 2-2: Rendement des chauffe-eau instantanés électriques à un seul point

d'utilisation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 91.140.65 ISBN 978-2-8322-1040-7

– 2 – IEC 63159-2-2:2021 © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General test conditions . 5
4.3 General conditions . 5
4.3.101 Pressure, temperature, flow, and power conditions . 5
4.4 Test setup . 6
5 Energy efficiency . 6
5.1 Test method . 6
5.1.1 General . 6
5.1.1.101 Setpoints . 6
5.1.2 Static efficiency . 6
5.1.3 Start up losses . 6
5.2.2 Daily energy demand . 6
Annex A (normative) Load pattern . 7
Annex B (normative) Test setup . 8
Bibliography . 11

Figure B.1 – Test setup for open-outlet instantaneous heater . 8
Figure B.2 – Test setup for open-outlet instantaneous heater . 9
Figure B.3 – Example of thermocouple housing . 9
Figure B.4 – Outlet funnel . 10

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD ELECTRIC INSTANTANEOUS WATER HEATERS –
METHODS FOR MEASURING THE PERFORMANCE –

Part 2-2: Efficiency of single point of use electric
instantaneous water heaters
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 63159-2-2 has been prepared by subcommittee 59C: Electrical
heating appliances for household and similar purposes, of IEC technical committee 59:
Performance of household and similar electrical appliances.
The text of this International Standard is based on the following documents:
Draft Report on voting
59C/269/FDIS 59C/273/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

– 4 – IEC 63159-2-2:2021 © IEC 2021
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
This International Standard is to be used in conjunction with IEC 63159-1:2021.
This standard supplements or modifies the corresponding clauses in IEC 63159-1. When a
particular subclause of IEC 63159-1 is not mentioned in this standard, that subclause is
applicable as far as reasonable. Where this standard states "addition", "modification" or
"replacement", the relevant requirements, test specifications or explanatory matter in
IEC 63159-1 should be adapted accordingly.
Subclauses or figures that are additional to those in IEC 63159-1 are numbered starting from
101. Additional annexes are lettered AA, BB, etc.
A list of all the parts in the IEC 63159 series, published under the general title Household
electric instantaneous water heaters – Methods for measuring the performance, can be found
on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
...