Household and similar electrical appliances - Safety - Part 2-21: Particular requirements for storage water heaters

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.
This standard is also applicable to immersion heater units intended to be retrofitted in a
heat exchange closed water heater having provision for retrofitting. Such a unit shall comply
with the requirements in Annex AA.
NOTE Australia, Netherlands and New Zealand do not allow immersion heater units intended to be retrofitted in
a heat exchange closed water heater unless:
– the immersion heater unit has been tested with the tank models and brands listed in the instructions of the
immersion heater unit;
– the tank models and brands list the models of the immersion heater units that can be retrofitted.
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 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).

Sicherheit elektrischer Geräte für den Hausgebrauch und ähnliche Zwecke - Teil 2-21: Besondere Anforderungen für Wassererwärmer (Warmwasserspeicher und Warmwasserboiler)

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

Remplacer cet article de l'EN 60335-1:2012 par le suivant: Le présent document 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. Le présent document est également applicable aux éléments thermoplongeurs destinés à être rénovés dans un chauffe-eau fermé à échange thermique prévu pour la remise à niveau. Un tel élément doit être conforme aux exigences de l'Annexe AA. Le présent document traite des risques raisonnablement prévisibles présentés par les appareils et les machines, et encourus par tous les individus. Cependant, cette norme ne tient pas compte en général: • de l’utilisation de l’appareil comme jouet par des enfants; • de l’utilisation de l’appareil par de très jeunes enfants; Il est admis que les personnes très vulnérables peuvent avoir des besoins dépassant le cadre du présent document. NOTE 101 L’attention est attirée sur le fait que - pour les appareils destinés à être utilisés dans des véhicules ou à bord de navires ou d’avions, des exigences supplémentaires peuvent être nécessaires; - dans de nombreux pays, des exigences 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 Le présent document ne s’applique pas - aux appareils pour faire bouillir l'eau (EN 60335-2-15); - aux chauffe-eau instantanés (EN 60335-2-35); - aux distributeurs commerciaux avec ou sans moyens de paiement (EN 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).

Gospodinjski in podobni električni aparati - Varnost - 2-21. del: Posebne zahteve za akumulacijske grelnike vode

General Information

Status
Published
Public Enquiry End Date
30-Apr-2016
Publication Date
22-Jul-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-Jul-2021
Due Date
23-Sep-2021
Completion Date
23-Jul-2021

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Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 60335-2-21:2021
01-september-2021

Gospodinjski in podobni električni aparati - Varnost - 2-21. del: Posebne zahteve

za akumulacijske grelnike vode

Household and similar electrical appliances - Safety - Part 2-21: Particular requirements

for storage water heaters

Sicherheit elektrischer Geräte für den Hausgebrauch und ähnliche Zwecke - Teil 2-21:

Besondere Anforderungen für Wassererwärmer (Warmwasserspeicher und
Warmwasserboiler)

Appareils électrodomestiques et analogues - Sécurité - Partie 2-21: Règles particulières

pour les chauffe-eau à accumulation
Ta slovenski standard je istoveten z: EN 60335-2-21:2021
ICS:
13.120 Varnost na domu Domestic safety
91.140.65 Oprema za ogrevanje vode Water heating equipment
SIST EN 60335-2-21:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60335-2-21:2021
---------------------- Page: 2 ----------------------
SIST EN 60335-2-21:2021
EUROPEAN STANDARD EN 60335-2-21
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2021
ICS 13.120; 91.140.65 Supersedes EN 60335-2-21:2003 and all of its
amendments and corrigenda (if any)
English Version
Household and similar electrical appliances - Safety - Part 2-21:
Particular requirements for storage water heaters
(IEC 60335-2-21:2012 , modified + COR1:2013)

Appareils électrodomestiques et analogues - Sécurité - Sicherheit elektrischer Geräte für den Hausgebrauch und

Partie 2-21: Règles particulières pour les chauffe-eau à ähnliche Zwecke - Teil 2-21: Besondere Anforderungen für

accumulation Wassererwärmer (Warmwasserspeicher und
(IEC 60335-2-21:2012 , modifiée + COR1:2013) Warmwasserboiler)
(IEC 60335-2-21:2012 , modifiziert + COR1:2013)

This European Standard was approved by CENELEC on 2020-08-10. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard 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 European Standard 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,

Turkey 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

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60335-2-21:2021 E
---------------------- Page: 3 ----------------------
SIST EN 60335-2-21:2021
EN 60335-2-21:2021 (E)
European foreword

This document (EN 60335-2-21:2021) consists of the text of IEC 60335-2-21:2012 prepared by IEC/TC 61

"Safety of household and similar electrical appliances", together with the common modifications prepared by

CLC/TC 61 "Safety of household and similar electrical appliances".
The following dates are fixed:
• latest date by which this document has to be implemented at (dop) 2021-12-18
national level by publication of an identical national standard or
by endorsement

• latest date by which the national standards conflicting with this (dow) 2024-06-18

document have to be withdrawn

This document supersedes EN 60335-2-21:2003, and all of its amendments and corrigenda (if any).

This document is read in conjunction with EN 60335-1:2012+A11:2014+ A13:2017+A1:2019+

A14:2019+A2:2019.

The numbering system for European sub-clauses, notes and annexes that are additional to those in the IEC

standard are prefixed with the letter Z.

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 has been prepared under a mandate given to CENELEC by the European Commission and

the European Free Trade Association, and supports essential requirements of EU Directive(s).

For the relationship with EU Directive see informative Annex ZZA, which is an integral part of this document.

Endorsement notice

The text of the International Standard IEC 60335-2-21:2012 was approved by CENELEC as a European

Standard with agreed common modifications.
---------------------- Page: 4 ----------------------
SIST EN 60335-2-21:2021
EN 60335-2-21:2021 (E)
1 Modification to the Scope
Delete the note to the fourth paragraph
Replace the fifth paragraph except for notes 101 and 102 by the following:

This document deals with the reasonably foreseeable hazards presented by appliances and machines that

are encountered by all persons.
However, in general, it does not take into account:
• children playing with the appliance;
• the use of the appliance by very young children;

It is recognized that very vulnerable people may have needs beyond the level addressed in this document.

2 Modification to Clause 7 "Marking and instructions"
7.12 Modification:

Replace in the first sentence of the fourth paragraph of Part 1 the words "8 years" by "3 years".

Add a new second sentence fourth paragraph of Part 1 the following:

Children aged from 3 to 8 years are only allowed to operate the tap connected to the water heater.

3 Modification to Clause 19 "Abnormal operation"
19.2 Addition:
Add the following sentence to Note 101:

If there are separate thermostats in the phases of a three-phase water heater with star connection (without neutral), all

thermostats are short-circuited simultaneously.
4 Modification to the annexes
Modify the annexes as follows:
---------------------- Page: 5 ----------------------
SIST EN 60335-2-21:2021
EN 60335-2-21:2021 (E)
Annex ZA
(normative)
Special national conditions
Addition:
Clause Special national condition
22.101 Denmark, Finland, Norway and Sweden
For closed water heaters, the minimum rated pressure is 1,0 MPa.
22.102 Denmark (Instruction AT 2.1.2-4, 1994 and AT Instruction B.4.8)

Cold water inlets on the heated storage water heater, the safety valve and the blow out

piping shall have a clear flow diameter of at least Ø 20 mm.
Annex ZB
(informative)
A-deviations
Addition:
Clause Deviation
24.101 United Kingdom (Building Regulation Part G3)

An unvented water heater shall be fitted with two independent safety devices, in addition to the

thermostat used for normal temperature control. These can be a non-self-resetting thermal cut-

out and a temperature relief valve according to BS 6283 Part 2 or a combined temperature and

pressure relief valve according to BS EN 1490.
24.102 United Kingdom (Building Regulation Part G3)
The water temperature of the stored water shall at no time exceed 100 °C.
---------------------- Page: 6 ----------------------
SIST EN 60335-2-21:2021
EN 60335-2-21:2021 (E)
Replace Annex ZZA in the part 1 by the following:
Annex ZZA
(informative)

Relationship between this European Standard and the safety objectives of Directive

2014/35/EU [2014 OJ L96] aimed to be covered

This European Standard has been prepared under a Commission’s standardization request relating to

harmonized standards in the field of the Low Voltage Directive, M/511, to provide one voluntary means of

conforming to safety objectives of Directive 2014/35/EU of the European Parliament and of the Council of

26 February 2014 on the harmonization of the laws of the Member States relating to the making available on

the market of electrical equipment designed for use within certain voltage limits [2014 OJ L96].

Once this standard is cited in the Official Journal of the European Union under that Directive, compliance

with the normative clauses of this standard given in Table ZZA.1 confers, within the limits of the scope of this

standard, a presumption of conformity with the corresponding safety objectives of that Directive, and

associated EFTA regulations.

Compliance with this Part 2 when used together with the Part 1 provides one means of conformity with the

safety objectives.
Table ZZA.1 – Correspondence between this European Standard
and Annex I of Directive 2014/35/EU [2014 OJ L96]
Safety objectives of Clause(s) / sub-clause(s) Remarks/
Directive 2014/35/EU of this EN Notes
1 a) Clauses 4, 7 None
1 b) Clauses 4, 7 None
1 c) Clauses 4, 7 None
Clauses 6, 7, 8, 10, 11, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23,
2 a) None
24, 25, 26, 27, 28, 29, 30, 31
Clauses 6, 7, 8, 10, 11, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23,
2 b) None
24, 25, 26, 27, 28, 29, 30, 31
2 c) Clauses 6, 7, 11, 15, 17, 19, 20, 21, 22, 24, 25, 30, 32 None
Clauses 6, 7, 8, 10, 11, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23,
2 d) None
24, 25, 26, 27, 28, 29, 30, 31
3 a) Clauses 6, 7, 11, 17, 19, 20, 21, 22 None
3 b) Clauses 7, 11, 15, 19, 22, 25, 32 None
3 c) Clauses 6, 7, 9, 10, 11, 14, 17, 19, 21, 22 None

WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European Standard

is maintained in the list published in the Official Journal of the European Union. Users of this standard should

consult frequently the latest list published in the Official Journal of the European Union.

WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of this

standard.
---------------------- Page: 7 ----------------------
SIST EN 60335-2-21:2021
EN 60335-2-21:2021 (E)
Annex ZZB
(informative)
Relationship between this European standard and the essential
requirements of Directive 2006/42/EC aimed to be covered
Annex ZZB is not applicable
---------------------- Page: 8 ----------------------
SIST EN 60335-2-21:2021
EN 60335-2-21:2021 (E)
5 Modification to the Bibliography
Add the following notes to the relevant references in the addition:
IEC 60335-2-15 NOTE Harmonized as EN 60335-2-15.
IEC 60335-2-35 NOTE Harmonized as EN 60335-2-35.
IEC 60335-2-75 NOTE Harmonized as EN 60335-2-75.
---------------------- Page: 9 ----------------------
SIST EN 60335-2-21:2021
---------------------- Page: 10 ----------------------
SIST EN 60335-2-21:2021
IEC 60335-2-21
Edition 6.0 2012-11
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
CODE PRIX U
ICS 13.120; 91.140.65 ISBN 978-2-83220-452-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 11 ----------------------
SIST EN 60335-2-21:2021
– 2 – 60335-2-21 © IEC:2012
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 7

1 Scope ............................................................................................................................... 8

2 Normative references ....................................................................................................... 9

3 Terms and definitions ....................................................................................................... 9

4 General requirement ....................................................................................................... 10

5 General conditions for the tests ...................................................................................... 10

6 Classification .................................................................................................................. 10

7 Marking and instructions ................................................................................................. 10

8 Protection against access to live parts ............................................................................ 12

9 Starting of motor-operated appliances ............................................................................ 12

10 Power input and current.................................................................................................. 12

11 Heating........................................................................................................................... 12

12 Void ................................................................................................................................ 12

13 Leakage current and electric strength at operating temperature ...................................... 12

14 Transient overvoltages ................................................................................................... 12

15 Moisture resistance ........................................................................................................ 12

16 Leakage current and electric strength ............................................................................. 12

17 Overload protection of transformers and associated circuits ........................................... 13

18 Endurance ...................................................................................................................... 13

19 Abnormal operation ........................................................................................................ 13

20 Stability and mechanical hazards.................................................................................... 14

21 Mechanical strength ....................................................................................................... 14

22 Construction ................................................................................................................... 14

23 Internal wiring ................................................................................................................. 16

24 Components ................................................................................................................... 16

25 Supply connection and external flexible cords ................................................................ 18

26 Terminals for external conductors ................................................................................... 18

27 Provision for earthing ..................................................................................................... 18

28 Screws and connections ................................................................................................. 18

29 Clearances, creepage distances and solid insulation ...................................................... 18

30 Resistance to heat and fire ............................................................................................. 18

31 Resistance to rusting ...................................................................................................... 19

32 Radiation, toxicity and similar hazards ............................................................................ 19

Annexes ............................................................................................................................... 22

Annex A (informative) Routine tests ..................................................................................... 22

Annex R (normative) Software evaluation ............................................................................ 23

Annex AA (normative) Additional requirement for immersion heater units intended for

the installation in heat exchange closed water heaters .......................................................... 24

Bibliography .......................................................................................................................... 27

---------------------- Page: 12 ----------------------
SIST EN 60335-2-21:2021
60335-2-21 © IEC:2012 – 3 –

Figure 101 – Examples of types of storage water heaters ..................................................... 20

Figure 102 – Example of positions of the thermocouples ....................................................... 21

---------------------- Page: 13 ----------------------
SIST EN 60335-2-21:2021
– 4 – 60335-2-21 © IEC:2012
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

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 sixth edition cancels and replaces the fifth edition published in 2002 including its

Amendment 1 (2004) and its Amendment 2 (2008). It constitutes a technical revision.

The principal changes in this edition as compared with the fifth edition of IEC 60335-2-21 are

as follows (minor changes are not listed):
– added requirements for immersion heater units (fixed immersion heaters);
– removed reference to ISO 13732-1 from Bibliography.
---------------------- Page: 14 ----------------------
SIST EN 60335-2-21:2021
60335-2-21 © IEC:2012 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
61/4452/FDIS 61/4505/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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 fifth edition (2010) 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 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 this publication will remain unchanged until

the stability 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 this publication be adopted for implementation

nationally not earlier than 12 months or later than 36 months from the date of publication.

A list of all parts of the IEC 60335 series, under the general title: Household and similar

electrical appliances – Safety, can be found on the IEC website.
The following differences exist in the countries indicated below.
– 6.1: Class 0I appliances are allowed (Japan).
---------------------- Page: 15 ----------------------
SIST EN 60335-2-21:2021
– 6 – 60335-2-21 © IEC:2012
– 6.2: IPX0 water heaters are allowed (France, 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: 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).

– 22.47: 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).

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

(South Africa).
– 22.102: The temperature limit is 95 °C (South Africa).
– 22.102: The temperature limit is 85 °C (USA).

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

– 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: 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,).
– 22.109: A tool is not required for draining the appliance (USA).

– 22.110: Additional requirements apply to plastic or resin-based containers for open outlet,

cistern type and low pressure type (South Africa).
– 24.1.4 Additional requirements apply to Thermal cut-outs (South Africa)

– 24.101: Thermal cut-outs are required to have a trip-free switching mechanism (USA).

– 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 contents of the corrigendum of April 2013 have been included in this copy.
---------------------- Page: 16 ----------------------
SIST EN 60335-2-21:2021
60335-2-21 © IEC:2012 – 7 –
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.

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
...

SLOVENSKI STANDARD
oSIST prEN 60335-2-21:2016
01-april-2016

*RVSRGLQMVNLLQSRGREQLHOHNWULþQLDSDUDWL9DUQRVWGHO3RVHEQH]DKWHYH

]DDNXPXODFLMVNHJUHOQLNHYRGH

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
Ta slovenski standard je istoveten z: prEN 60335-2-21
ICS:
13.120 Varnost na domu Domestic safety
91.140.65 Oprema za ogrevanje vode Water heating equipment
oSIST prEN 60335-2-21:2016 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 60335-2-21:2016
---------------------- Page: 2 ----------------------
oSIST prEN 60335-2-21:2016
EUROPEAN STANDARD DRAFT
prEN 60335-2-21
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2016
ICS 13.120; 91.140.65 Will supersede EN 60335-2-21:2003
English Version
Household and similar electrical appliances - Safety - Part 2-21:
Particular requirements for storage water heaters
(IEC 60335-2-21:2012 , modified)

Appareils électrodomestiques et analogues - Sécurité - Sicherheit elektrischer Geräte für den Hausgebrauch und

Partie 2-21: Règles particulières pour les chauffe-eau à ähnliche Zwecke - Teil 2-21: Besondere Anforderungen für

accumulation Wassererwärmer (Warmwasserspeicher und
(IEC 60335-2-21:2012 , modifiée) Warmwasserboiler)
(IEC 60335-2-21:2012 , modifiziert)
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2016-04-08.
The text of this draft consists of the text of IEC 60335-2-21:2012.

If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which

stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey 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: Avenue Marnix 17, B-1000 Brussels

© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Project: 23925 Ref. No. prEN 60335-2-21 E
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oSIST prEN 60335-2-21:2016
prEN 60335-2-21:2016 - 2 -
1 European foreword

2 This document (prEN 60335-2-21:2016) consists of the text of IEC 60335-2-21:2012 prepared by

3 IEC/TC 61 "Safety of household and similar electrical appliances", together with the common

4 modifications prepared by CLC/TC 61 "Safety of household and similar electrical appliances".

6 This document is currently submitted to the Enquiry.
8 The following dates are proposed:
• latest date by which the existence of
(doa) dor + 6 months
this document has to be announced
at national level
• latest date by which this document has
(dop) dor + 12 months
to be implemented at national level
by publication of an identical
national standard or by endorsement
• latest date by which the national
(dow) dor + 36 months
standards conflicting with this document
(to be confirmed or
have to be withdrawn
modified when voting)
9 This document will supersede EN 60335-2-21:2003.

10 This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed

11 for Use within Certain Voltage Limits (LVD - 2006/95/EC).
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oSIST prEN 60335-2-21:2016
- 3 - prEN 60335-2-21:2016
12 1 Scope
13 This clause of Part 1 is replaced by the following.

14 This European Standard deals with the safety of electric storage water heaters for household and similar

15 purposes and intended for heating water below boiling temperature, their rated voltage being not more

16 than 250 V for single-phase appliances and 480 V for other appliances.

17 Appliances not intended for normal household use but which nevertheless may be a source of danger to

18 the public, such as appliances intended to be used by laymen in shops, in light industry and on farms, are

19 within the scope of this standard.

20 This standard is also applicable to immersion heater units intended to be retrofitted in a heat exchange

21 closed water heater having provision for retrofitting. Such a unit shall comply with the requirements in

22 Annex AA.

23 This standard deals with the reasonably foreseeable hazards presented by appliances and machines that

24 are encountered by all persons.
25 However, in general, it does not take into account:
26 • children playing with the appliance;
27 • the use of the appliance by very young children;

28 It is recognized that very vulnerable people may have needs beyond the level addressed in this

29 standard.
30 NOTE 101 Attention is drawn to the fact that

31 - for appliances intended to be used in vehicles or on board ships or aircraft, additional requirements may be

32 necessary;

33 - in many countries additional requirements are specified by the national health authorities, the national authorities

34 responsible for the protection of labour and similar authorities;

35 - in many countries regulations exist for the installation of equipment connected to the water mains.

36 NOTE 102 This standard does not apply to
37 - appliances for boiling water (EN 60335-2-15);
38 - instantaneous water heaters (EN 60335-2-35);
39 - commercial dispensing appliances and vending machines (EN 60335-2-75);
40 - appliances intended exclusively for industrial purposes;

41 - appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive

42 or explosive atmosphere (dust, vapour or gas).
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oSIST prEN 60335-2-21:2016
prEN 60335-2-21:2016 - 4 -
44 7 Marking and instructions
45 7.10

46 Delete the text in EN 60335-1 beginning with "Devices used to… " until "… to be reached by

47 vulnerable persons."
48 7.12 Modification:

49 Replace in the first sentence of the fourth paragraph of EN 60335-1:2012 the words "8 years" by

50 "3 years".
51 Add after the sentence the following:

52 Children aged from 3 to 8 years are only allowed to operate the tap connected to the water heater.

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oSIST prEN 60335-2-21:2016
- 5 - prEN 60335-2-21:2016

53 NOTE Unless National Committees re-confirm the text in Annex ZA and Annex ZB they will be removed.

54 Annex ZA
55 (normative)
56 Special national conditions
57 Addition:
58 Clause Special national condition
59 22.101 Denmark, Finland, Norway and Sweden
60 For closed water heaters, the minimum rated pressure is 1,0 MPa.
61 22.102 Denmark (Instruction AT 2.1.2-4, 1994 and AT Instruction B.4.8)

62 Cold water inlets on the storage water heater, the safety valve and the blow out piping

63 shall have a clear flow diameter of at least Ø 20 mm.
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oSIST prEN 60335-2-21:2016
prEN 60335-2-21:2016 - 6 -
64 Annex ZB
65 (informative)
67 A-deviations
68 Addition:
69 Clause Deviation
70 24.101 United Kingdom (Building Regulation Part G3)

71 In addition to a non-self-resetting thermal cut-out, any closed water heater having a

72 storage capacity in excess of 15 l shall be fitted with a temperature relief valve according

73 to BS 6283 Part 2 or a combined temperature and pressure relief valve according to BS 6283

74 Part 3.
75 24.102 United Kingdom (Building Regulation Part G3)

76 The water temperature of the stored water shall not at any time exceed 99 °C in closed water

77 heaters having a storage capacity in excess of 15 l.
78 1 Netherlands

79 Netherlands does not allow immersion heater units intended to be retrofitted in a heat

80 exchange closed water heater unless:

81 - the immersion heater unit has been tested with the tank models and brands listed in the

82 instructions of the immersion heater unit;

83 - the tank models and brands list the models of the immersion heater units that can be

84 retrofitted.
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oSIST prEN 60335-2-21:2016
IEC 60335-2-21
Edition 6.0 2012-11
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
CODE PRIX U
ICS 13.120; 91.140.65 ISBN 978-2-83220-452-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 9 ----------------------
oSIST prEN 60335-2-21:2016
– 2 – 60335-2-21 © IEC:2012
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 7

1 Scope ............................................................................................................................... 8

2 Normative references ....................................................................................................... 9

3 Terms and definitions ....................................................................................................... 9

4 General requirement ....................................................................................................... 10

5 General conditions for the tests ...................................................................................... 10

6 Classification .................................................................................................................. 10

7 Marking and instructions ................................................................................................. 10

8 Protection against access to live parts ............................................................................ 12

9 Starting of motor-operated appliances ............................................................................ 12

10 Power input and current.................................................................................................. 12

11 Heating........................................................................................................................... 12

12 Void ................................................................................................................................ 12

13 Leakage current and electric strength at operating temperature ...................................... 12

14 Transient overvoltages ................................................................................................... 12

15 Moisture resistance ........................................................................................................ 12

16 Leakage current and electric strength ............................................................................. 12

17 Overload protection of transformers and associated circuits ........................................... 13

18 Endurance ...................................................................................................................... 13

19 Abnormal operation ........................................................................................................ 13

20 Stability and mechanical hazards.................................................................................... 14

21 Mechanical strength ....................................................................................................... 14

22 Construction ................................................................................................................... 14

23 Internal wiring ................................................................................................................. 16

24 Components ................................................................................................................... 16

25 Supply connection and external flexible cords ................................................................ 18

26 Terminals for external conductors ................................................................................... 18

27 Provision for earthing ..................................................................................................... 18

28 Screws and connections ................................................................................................. 18

29 Clearances, creepage distances and solid insulation ...................................................... 18

30 Resistance to heat and fire ............................................................................................. 18

31 Resistance to rusting ...................................................................................................... 19

32 Radiation, toxicity and similar hazards ............................................................................ 19

Annexes ............................................................................................................................... 22

Annex A (informative) Routine tests ..................................................................................... 22

Annex R (normative) Software evaluation ............................................................................ 23

Annex AA (normative) Additional requirement for immersion heater units intended for

the installation in heat exchange closed water heaters .......................................................... 24

Bibliography .......................................................................................................................... 27

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oSIST prEN 60335-2-21:2016
60335-2-21 © IEC:2012 – 3 –

Figure 101 – Examples of types of storage water heaters ..................................................... 20

Figure 102 – Example of positions of the thermocouples ....................................................... 21

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oSIST prEN 60335-2-21:2016
– 4 – 60335-2-21 © IEC:2012
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

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 sixth edition cancels and replaces the fifth edition published in 2002 including its

Amendment 1 (2004) and its Amendment 2 (2008). It constitutes a technical revision.

The principal changes in this edition as compared with the fifth edition of IEC 60335-2-21 are

as follows (minor changes are not listed):
– added requirements for immersion heater units (fixed immersion heaters);
– removed reference to ISO 13732-1 from Bibliography.
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oSIST prEN 60335-2-21:2016
60335-2-21 © IEC:2012 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
61/4452/FDIS 61/4505/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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 fifth edition (2010) 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 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 this publication will remain unchanged until

the stability 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 this publication be adopted for implementation

nationally not earlier than 12 months or later than 36 months from the date of publication.

A list of all parts of the IEC 60335 series, under the general title: Household and similar

electrical appliances – Safety, can be found on the IEC website.
The following differences exist in the countries indicated below.
– 6.1: Class 0I appliances are allowed (Japan).
---------------------- Page: 13 ----------------------
oSIST prEN 60335-2-21:2016
– 6 – 60335-2-21 © IEC:2012
– 6.2: IPX0 water heaters are allowed (France, 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: 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).

– 22.47: 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).

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

(South Africa).
– 22.102: The temperature limit is 95 °C (South Africa).
– 22.102: The temperature limit is 85 °C (USA).

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

– 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: 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,).
– 22.109: A tool is not required for draining the appliance (USA).

– 22.110: Additional requirements apply to plastic or resin-based containers for open outlet,

cistern type and low pressure type (South Africa).
– 24.1.4 Additional requirements apply to Thermal cut-outs (South Africa)

– 24.101: Thermal cut-outs are required to have a trip-free switching mechanism (USA).

– 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 contents of the corrigendum of April 2013 have been included in this copy.
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oSIST prEN 60335-2-21:2016
60335-2-21 © IEC:2012 – 7 –
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.

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.
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oSIST prEN 60335-2-21:2016
– 8 – 60335-2-21 © IEC:2012
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.

This standard is also applicable to immersion heater units intended to be retrofitted in a

heat exchange closed water heater having provision for retrofitting. Such a unit shall comply

with the requirements in Annex AA.

NOTE Australia, Netherlands and New Zealand do not allow immersion heater units intended to be retrofitted in

a heat exchange closed water heater unless:

– the immersion heater unit has been tested with the tank models and brands listed in the instructions of the

immersion
...

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