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SLOVENSKI STANDARD
oSIST prEN 26:2020
01-januar-2020
Pretočni plinski grelniki vode za pripravo tople sanitarne vode
Gas-fired instantaneous water heaters for the production of domestic hot water
Gasbeheizte Durchlauf-Wasserheizer für den sanitären Gebrauch
Appareils de production instantanée d'eau chaude pour usages sanitaires utilisant les
combustibles gazeux
Ta slovenski standard je istoveten z: prEN 26
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
97.100.20 Plinski grelniki Gas heaters
oSIST prEN 26:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 26:2020
oSIST prEN 26:2020
DRAFT
EUROPEAN STANDARD
prEN 26
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2020
ICS 91.140.65 Will supersede EN 26:2015
English Version
Gas-fired instantaneous water heaters for the production
of domestic hot water
Appareils de production instantanée d'eau chaude Gasbeheizte Durchlauf-Wasserheizer für den sanitären
pour usages sanitaires utilisant les combustibles Gebrauch
gazeux
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 48.
If this draft becomes a European Standard, CEN 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 CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 26:2020 E
worldwide for CEN national Members.
oSIST prEN 26:2020
prEN 26:2020 (E)
Contents Page
European Foreword . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 11
4 Classification . 27
4.1 Gases and appliance categories . 27
4.2 Mode of air supply and evacuation of the combustion products . 27
4.3 Water pressure . 27
5 Constructional requirements . 27
5.1 Conversion to different gases . 27
5.1.1 Introduction . 27
5.1.2 General . 27
5.2 Materials . 28
5.2.1 General requirements related to the use of materials in water heaters . 28
5.2.2 Materials in contact with water for human consumption . 29
5.2.3 Durability against corrosion of combustion product evacuation duct . 30
5.2.4 Design - Assembly - Strength . 31
5.2.5 Accessibility - Ease of maintenance - Fitting and removal . 31
5.2.6 Connection to gas and water pipes . 31
5.2.7 Soundness . 32
5.2.8 Supply of combustion air and evacuation of the combustion products . 33
5.2.9 Checking the state of operation . 36
5.2.10 Drainage . 37
5.2.11 Electrical and electromagnetic safety . 37
5.2.12 Operational safety in the event of failure of the auxiliary energy . 38
5.3 Adjusting, control and safety devices . 38
5.3.1 General . 38
5.3.2 Shut off valves and/or gas rate adjusters . 39
5.3.3 Preset gas rate adjusters . 40
5.3.4 Gas pressure regulator . 40
5.3.5 Pressure test points. 41
5.3.6 Automatic water-operated gas valve . 41
5.3.7 Ignition devices . 41
5.3.8 Flame supervision device . 42
5.3.9 Atmosphere sensing device for type A appliances . 43
AS
5.3.10 Combustion products discharge safety device for type B , B and B
11BS 12BS 13BS
appliances . 44
5.3.11 Protection against accidental overheating of thermostatic appliances . 44
5.3.12 Composition of the gas circuit . 44
5.3.13 Protection against frost for appliances intended to be installed in a partially
protected place . 45
5.3.14 Protection against the ingress of rain . 45
5.4 Main burner . 45
5.4.1 Materials in contact with condensate . 45
oSIST prEN 26:2020
prEN 26:2020 (E)
5.4.2 Discharge of condensate . 46
5.4.3 Control of the combustion products temperature . 46
5.4.4 Chemical composition of the condensate . 46
6 Operational requirements . 47
6.1 General . 47
6.1.1 Introduction. 47
6.1.2 Characteristics of the test gases . 47
6.1.3 Requirements for preparation of the test gases . 47
6.1.4 Choice of test gases . 47
6.1.5 Test pressures . 47
6.1.6 General test conditions . 47
6.2 Soundness . 51
6.2.1 Soundness of the gas circuit . 51
6.2.2 Soundness of the combustion circuit and evacuation of the combustion products . 53
6.2.3 Soundness of the water circuit. 58
6.3 Heat inputs . 58
6.3.1 General . 58
6.3.2 Nominal heat input. 60
6.3.3 Minimum heat input . 61
6.4 Temperature of the control knobs . 61
6.4.1 Requirements . 61
6.4.2 Test . 61
6.5 Temperature of the adjusting, control and safety devices . 61
6.5.1 Requirement . 61
6.5.2 Test . 61
6.6 Temperature of the appliance casing, the surface on which it is installed and
adjacent surfaces and external temperature of the ducts . 62
6.6.1 Requirements . 62
6.6.2 Tests . 62
6.7 Ignition - Cross-lighting - Flame stability . 63
6.7.1 Operation in still air for all appliances . 63
6.7.2 Supplementary tests for appliances of types A and B except for B . 65
AS 1 14
6.7.3 Supplementary tests for type C appliances and outdoors and/or partially protected
appliances. 66
6.7.4 Supplementary tests for type C a
...