SIST EN 50440:2016/A2:2026

SLOVENSKI STANDARD
01-december-2026
Učinkovitost gospodinjskih električnih akumulacijskih grelnikov vode in
preskusne metode - Dopolnilo A2
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/A2:2026
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 EN 50440:2015/A2

NORME EUROPÉENNE
EUROPÄISCHE NORM October 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 amendment A2 modifies the European Standard EN 50440:2015; it was approved by CENELEC on 2026-08-31. 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.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This amendment exists 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.

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.
Ref. No. EN 50440:2015/A2:2026 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/A2:2026) has been prepared by CLC/TC 59X “Performance of household and
similar electrical appliances”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2027-10-31
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2029-10-31
conflicting with this document have to be
withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with EN 50440:2015.
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.
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”
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 the useful water actually delivered during the test. “Useful water” is water with a temperature
higher than a threshold value Tm for tappings in a profile specified in Table 4.
“
5 Modification to Clause 8, “Reference conditions”
Replace the title of the clause as follows: “General test condi
...