IEC 63159-2-1:2021

IEC 63159-2-1 ®
Edition 1.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household electric instantaneous water heaters – Methods for measuring the
performance –
Part 2-1: Multifunctional electric instantaneous water heaters

Chauffe-eau instantanés électrodomestiques – Méthodes de mesure de
l'aptitude à la fonction –
Partie 2-1: Chauffe-eau instantanés électriques multifonctions

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IEC 63159-2-1 ®
Edition 1.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household electric instantaneous water heaters – Methods for measuring the

performance –
Part 2-1: Multifunctional electric instantaneous water heaters

Chauffe-eau instantanés électrodomestiques – Méthodes de mesure de

l'aptitude à la fonction –
Partie 2-1: Chauffe-eau instantanés électriques multifonctions

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 91.140.65 ISBN 978-2-8322-1040-6

– 2 – IEC 63159-2-1:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General test conditions . 8
4.3 General conditions . 8
4.4 Test setup . 8
4.101 Symbols and units . 8
4.102 Time constants (measuring time) . 9
4.103 Test setup . 9
4.103.1 Measurement setup . 9
4.103.2 Setpoints . 9
4.103.3 Measurement of flow pressure and flow rate . 9
4.103.4 Temperature measurement . 9
5 Energy efficiency . 10
6 Performance tests . 10
6.1 Determination of classification factor CF . 10
6.1.1 General . 10
6.1.2 Definition of a reference instantaneous water heater . 10
6.1.3 Calculation method of nominal energy consumption . 11
6.1.4 Determination of energy demand of the sample . 11
6.1.5 Definition of classes H and E . 11
6.2 Determination of flow rates . 11
6.2.1 General . 11
6.2.2 E class water heater . 11
6.2.3 H class water heater . 12
6.2.4 Determination of the flow rate as a function of the pressure difference . 13
6.3 Pressure difference on activation of the heating capacity . 13
6.3.1 General . 13
6.3.2 E class water heater . 13
6.3.3 H class water heater . 13
6.4 Behaviour at switch-on of the appliance . 14
6.4.1 General . 14
6.4.2 E class water heater . 14
6.4.3 H class water heater . 15
6.5 Behaviour following the change of the flow rate . 15
6.5.1 General . 15
6.5.2 E class water heater . 15
6.5.3 H class water heater . 16
6.6 Behaviour following interruption of the flow . 17
6.6.1 General . 17
6.6.2 E class water heater . 17
6.6.3 H class water heater . 18
6.7 Behaviour at constant temperature setting . 19
6.7.1 General . 19
6.7.2 E class water heater . 19

6.7.3 H class water heater . 19
6.8 Behaviour following the change of the temperature selector setting . 19
6.8.1 General . 19
6.8.2 Electronically controlled appliances . 19
6.8.3 H class water heater . 20
6.9 Behaviour at voltage limits . 20
6.10 Additional tests for electronic instantaneous water heaters . 21
6.10.1 General . 21
6.10.2 Behaviour of the outlet temperature at decreasing water inlet
temperature . 21
6.10.3 Behaviour of the outlet temperature at changing water inlet temperature . 22
Annex A (normative) Load pattern . 23
Annex B (normative) Test setup . 24
Bibliography . 29

Figure B.101 – Single point (vented) . 24
Figure B.102 – Multi point (unvented) . 25
Figure B.103 – Test setup . 26
Figure B.104 – Damping device (Detail 4) . 27
Figure B.105 – Water connection part (Detail 5) . 27
Figure B.106 – Water connection part (Detail 6) . 28

Table 101 – Symbols and units . 8
Table 102 – Nominal values for E class water heater . 12
Table 103 – Nominal values for H class water heater . 12
Table 104 – Flow pressure and flow rate for multi point appliances . 13
Table 105 – Flow pressure and flow rate for single point appliances . 13
Table 106 – Pressure difference and flow rate . 13
Table 107 – Pressure
...