SIST EN 50440:2016/oprA2:2026

SLOVENSKI STANDARD
01-april-2026
Učinkovitost gospodinjskih električnih akumulacijskih grelnikov vode in
preskusne metode
Efficiency of domestic electrical storage water heaters and testing methods
Effizienz von elektrischen Warmwasserspeichern für den Hausgebrauch und
Prüfverfahren
Efficacité des chauffe-eau électriques à accumulation et méthodes associées
Ta slovenski standard je istoveten z: EN 50440:2015/prA2:2026
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
EN 50440:2015
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA2
February 2026
ICS 91.140.65 -
English Version
Efficiency of domestic electrical storage water heaters and
testing methods
Efficacité des chauffe-eau électriques à accumulation et Effizienz von elektrischen Warmwasserspeichern für den
méthodes associées Hausgebrauch und Prüfverfahren
This draft amendment prA2, if approved, will modify the European Standard EN 50440:2015; it is submitted to CENELEC members for
enquiry.
Deadline for CENELEC: 2026-05-01.

It has been drawn up by CLC/TC 59X.

If this draft becomes an amendment, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.

This draft amendment was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 80529 Ref. No. EN 50440:2015/prA2:2026 E

Contents Page
European foreword . 3
1 Modification to Clause 1, Scope . 4
2 Modification to Clause 3, “Terms and definitions” . 4
3 Modification to Clause 4, “Symbols and Units” . 4
4 Modification to Clause 7, “General conditions for measurements” . 4
5 Modification to Clause 8, “Reference conditions” . 5
6 Modification to Clause 9, “Test procedures”.10
7 Modification to Clause 10, Data Report .11
8 Modification to Annex A, “Calculation of the specific energy efficiency and of the Annual
Consumption of electric energy” .11
9 Modification to the Bibliography .11
European foreword
This document (EN 50440:2015/prA2:2026) has been prepared by CLC/TC 59X “Performance of household
and similar electrical appliances”, the secretariat is held by DKE.
This document is currently submitted to the Enquiry.
The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
This document is read in conjunction with EN 50440:2015.
1 Modification to Clause 1, Scope
Replace the second dash item in the NOTE 1 with the following:
“- storage water heaters that do not use a tank to store hot water;”
Replace NOTE 2 with the following:
NOTE 2 This standard does not specify performance or safety requirements. For safety requirements see
EN IEC 60335-1 in conjunction with EN IEC 60335-2-21.
2 Modification to Clause 3, “Terms and definitions”
NOTE OF THE SECRETARY: It is suggested to keep “energized” in definition 3.3 instead of the suggested
“energised” term as it would imply multiple modification in the standard impairing the readability of an
amendment. It would have been easier in a consolidation version or new edition).
Add the following term entry:
”3.10
rated heat output
P
rated
heat output of the water heater when providing water heating at standard rating conditions, expressed in kW”
3 Modification to Clause 4, “Symbols and Units”
Add the following lines in Table 1:
“
Table 1 — Symbols
Symbol Unit Description
Q kWh Electricity consumption during the heat-up period (step 2)
heat-up
P kW Rated power output in kW
rated
P kW Nominal power input assigned to the appliance by the manufacturer
nom
C l Rated capacity of Water Heater, assigned to the appliance by the manufacturer
rated
“
4 Modification to Clause 7, “General conditions for measurements”
Replace Table 3 with the following:
“
Table 3 — Test conditions and outputs. Set values and tolerances
Permissible Permissible
Uncertainty of
deviation deviations of
Measured quantity Unit Value measurement Notes
(average over test individual
(accuracy)
period) measured values
Time
Time s    ±0,1
Maximum interval between
samples (during the deliver s 3
of hot water)
Maximum interval between
samples (during the no- s 60
deliver of hot water)
Sanitary water
°C/
cold water temperature 10 ±1 ±1 ±0,5
K
0,3
cold water pressure MPa   ±5 %

°C/
a, b
hot water temperature pattern   ±0,5
K
l /
volume flowrate pattern   ±1 %
min
volume measurements l    ±0,5 %
±2 % ±2 %
c
thermal energy kWh pattern ±2 % (overall)
(or ± 10 Wh) (or ± 10 Wh)
Ambient air
°C/
Temperature 20 ±1  ±1
K
a
To be measured by “rapid response thermometer”, meaning an instrument that registers within 1 s. at least 90 % of the
final temperature rise from 15 to 100 °C when the sensor is plunged in still water.
b
Thermocouple with a maximum diameter of 0,5 mm, centred in stream, directly at outlet
c
Apart from the maximum deviation a correction factor Qref/QH2O is applied, whereby Qref is taken from Table 4 and QH2O
is the energy content of th
...