EN 26:2023
(Main)Gas-fired instantaneous water heaters for the production of domestic hot water
Gas-fired instantaneous water heaters for the production of domestic hot water
This European Standard defines the specifications and test methods concerning the construction, safety, rational use of energy and fitness for purpose, and also the classification and marking of gas-fired instantaneous water heaters for sanitary uses, hereafter called “water heaters”.
This European Standard applies to water heaters:
- of types AAS, B11, B11BS, B12, B12BS, B13, B13BS, B14, B22, B23, B32, B33, B44, B52, B53, C11, C12, C13, C21, C22, C23, C32, C33, C42, C43, C52, C53, C62, C63, C72, C73, C82and C83 according to CEN/TR 1749;
- fitted with atmospheric burners;
- equipped with atmospheric burners assisted by a fan for the supply of combustion air or evacuation of combustion products or fully premix burners;
- using one or more combustible gases corresponding to the three gas families and at the pressures stated in accordance to EN 437;
- of nominal heat input not exceeding 70 kW;
- with an ignition burner or with direct ignition of the main burner.
In this European Standard, the heat inputs are expressed in relation to the net calorific value (Hi).
This European Standard does not contain all the requirements necessary for:
- boiling water appliances;
- appliances intended to be connected to a mechanical means of evacuating the combustion products;
- appliances which fulfil a dual role of space heating and heating water for sanitary use;
- appliances making use of the heat of condensation of the water contained in the combustion products;
- water heaters of types B21, B31, B41, B42, B43 and B51.
This European Standard only covers water heaters where the fan, if any, is an integral part of the appliance.
This European Standard:
- does not apply to appliances not intended to be connected to a flue when they are not fitted with an atmosphere sensing device;
- takes account of the information given in Technical Report CEN/CR 1472:1994 with respect to marking.
Type B appliances should be with a combustion products discharge safety device to comply with essential requirement 3.4.3 of the Gas Appliances Directive 2009/142/EC. In this European Standard, the appliance is identified as type B11BS.
Appliances intended to be installed outdoors or in a room separate from inhabited rooms and provided with appropriate ventilation are not required to have this combustion products discharge safety device but, in this case, appropriate warnings on the packaging, and in the instructions should clearly define the limited authorized use for this type of appliance. In this European Standard, the appliance is identified as type B11.
The main symbols used in this European Standard are summarized in Annex F.
Gasbeheizte Durchlauf-Wasserheizer für den sanitären Gebrauch
Dieses Dokument legt die Spezifikationen und Prüfmethoden sowie die Klassifizierung, Kennzeichnung und Energieeffizienzkennzeichnung von gasbeheizten Durchlauf Wasserheizern für den sanitären Gebrauch, im Folgenden als „Wasserheizer“ bezeichnet, fest.
Dieses Dokument ist anwendbar für Wasserheizer:
— von Typ A, B und C, wie jeweils in den entsprechenden Abschnitten beschrieben;
ANMERKUNG Für weitere Informationen zur Konfiguration der Gerätearten siehe EN 1749:2020.
— die in Übereinstimmung mit EN 437:2021 ein oder mehrere brennbare Gase der drei Gasfamilien und die angegebenen Drücke verwenden;
— mit einer Nennwärmebelastung bis höchstens 77 kW basierend auf dem Brennwert (GCV, en: gross calorific value);
— mit einem Zündbrenner oder direkter Zündung des Hauptbrenners.
In diesem Dokument werden die Wärmebelastungen auf den Heizwert (Hi) bezogen.
Dieses Dokument umfasst nicht alle notwendigen Anforderungen für:
— Kochwassergeräte;
— Geräte, die für den Anschluss an eine mechanische Abführung der Abgase vorgesehen sind;
— Geräte, die eine Doppelfunktion von Raumheizern und Warmwasserbereitung für den sanitären Gebrauch erfüllen.
Dieses Dokument behandelt nur Wasserheizer, bei denen, falls vorhanden, das Gebläse ein integraler Bestandteil des Gerätes ist.
Dieses Dokument ist nicht für die Abdeckung von Geräten vorgesehen, die dafür ausgelegt und gebaut wurden, Gas mit toxischen Komponenten zu verbrennen.
Appareils de production instantanée d'eau chaude pour usages sanitaires utilisant les combustibles gazeux
Le présent document définit les spécifications et méthodes d'essais, ainsi que la classification, le marquage et l'étiquetage énergétique des appareils de production instantanée d'eau chaude pour usages sanitaires utilisant les combustibles gazeux, désignés ci-après « chauffe-eau ».
Le présent document s'applique aux chauffe-eau :
de type A, B et C décrits aux articles appropriés ;
NOTE Pour plus d'informations sur la configuration de ces types d'appareils, voir l'EN 1749:2020.
utilisant un ou plusieurs combustibles gazeux correspondant aux trois familles de gaz et aux pressions indiquées conformément à l'EN 437:2021 ;
de débit calorifique nominal inférieur à 77 kW, sur la base du pouvoir calorifique supérieur (PCS) ;
avec brûleur d'allumage ou à allumage direct du brûleur principal.
Dans le présent document, les débits calorifiques sont exprimés par rapport au pouvoir calorifique inférieur (Hi).
Le présent document ne contient pas toutes les exigences nécessaires pour :
les appareils à eau bouillante ;
les appareils destinés à être connectés à des moyens mécaniques d'évacuation des produits de combustion ;
les appareils qui remplissent une double fonction de chauffage des locaux et de production d'eau chaude sanitaire.
Le présent document couvre uniquement les chauffe-eau où le ventilateur, le cas échéant, fait partie intégrante de l'appareil.
Le présent document n'a pas pour objet de couvrir les appareils conçus et construits pour brûler du gaz contenant des composants toxiques.
Pretočni plinski grelniki vode za pripravo tople sanitarne vode
Ta evropski standard določa specifikacije in preskusne metode v zvezi z izdelavo, varnostjo, ustreznostjo za predviden namen in smiselno porabo energije ter z razvrstitvijo in označevanjem pretočnih plinskih grelnikov vode za sanitarno uporabo, v nadaljnjem besedilu »grelniki vode«.
Ta evropski standard se uporablja za grelnike vode:
– tipov AAS, B11, B11BS, B12, B12BS, B13, B13BS, B14, B22, B23, B32, B33, B44, B52, B53, C11, C12, C13, C21, C22, C23, C32, C33, C42, C43, C52, C53, C62, C63, C72, C73, C82 in C83 v skladu s standardom CEN/TR 1749;
– z nameščenimi atmosferskimi gorilniki;
– z nameščenimi atmosferskimi gorilniki, ki vključujejo ventilator za dovajanje zgorevalnega zraka ali odvajanje produktov zgorevanja, ali z gorilniki s popolnim vnaprejšnjim mešanjem;
– ki uporabljajo enega ali več gorljivih plinov iz treh družin plinov pri tlakih, navedenih v skladu s standardom EN 437;
– z nazivno toplotno močjo, ki ne presega 70 kW;
– z gorilnikom z vžigom ali z neposrednim vžigom glavnega gorilnika.
V tem evropskem standardu je toplotna moč izražena v povezavi z neto toplotno vrednostjo (Hi).
Ta evropski standard ne zajema vseh potrebnih zahtev za:
– naprave za pripravo vrele vode;
– naprave za priključitev na mehansko sredstvo za odvajanje produktov zgorevanja;
– naprave z dvojno vlogo ogrevanja prostorov in ogrevanja vode za sanitarno uporabo;
– naprave, ki izkoriščajo toploto kondenzacije vode v produktih zgorevanja;
– grelnike vode tipov B21, B31, B41, B42, B43 in B51.
Ta evropski standard zajema samo grelnike vode, pri katerih je ventilator, če obstaja, sestavni del naprave.
Ta evropski standard:
– se ne uporablja za naprave, ki niso namenjene za povezavo z ventilacijsko cevjo, če niso opremljene z napravo za zaznavanje ozračja;
– upošteva informacije, podane v tehničnem poročilu CEN/CR 1472:1994 v zvezi z označevanjem.
Naprave tipa B naj bi vključevale varnostno napravo za odvajanje produktov zgorevanja, da je zagotovljena skladnost z osnovno zahtevo iz točke 3.4.3 direktive o plinskih napravah 2009/142/ES. V tem evropskem standardu je naprava opredeljena kot tip B11BS.
Naprave, namenjene namestitvi na prostem ali v prostoru, ki je ločen od bivalnih prostorov in opremljen z ustreznim prezračevanjem, ne potrebujejo varnostne naprave za odvajanje produktov zgorevanja, vendar naj bo v tem primeru z ustreznimi opozorili na embalaži in v navodilih jasno navedena omejena dovoljena uporaba za to vrsto naprave. V tem evropskem standardu je naprava opredeljena kot tip B11.
Glavni simboli, uporabljeni v tem evropskem standardu, so povzeti v dodatku F.
General Information
Relations
Overview
EN 26:2023 - Gas-fired instantaneous water heaters for the production of domestic hot water is the updated European standard that specifies construction, safety, energy-use and fitness-for-purpose requirements, plus classification and marking for gas-fired instantaneous (flow) water heaters used for sanitary hot water. It applies to a wide range of appliance categories (types AAS, B11…C83 according to CEN/TR 1749) with nominal heat input up to 70 kW and heat inputs expressed relative to net calorific value (Hi). The standard covers appliances with atmospheric, fan-assisted atmospheric or fully premix burners using gases defined by EN 437.
Key topics & technical requirements
- Scope & classification
- Appliance categories and installation/venting modes (type A, B, C variants).
- Gas families and test pressures per EN 437.
- Constructional requirements
- Materials (including those in contact with potable water), durability, corrosion resistance and flue duct specifications.
- Accessibility for maintenance, disassembly, recycling and safe installation of integral fans (fan must be an integral part of the appliance).
- Control, adjustment & safety devices
- Gas shut-off and pressure regulation, ignition systems, flame supervision and atmosphere sensing.
- Combustion products discharge safety device requirements for type B (e.g., B11BS) to meet the essential requirements of the Gas Appliances Directive 2009/142/EC.
- Operational & test methods
- Soundness (gas, combustion and water circuits), heat input tests (nominal and minimum), ignition, cross-lighting, flame stability and fan-operation tests.
- Combustion performance and emissions testing (CO and NOx considerations) and limits referenced in the standard.
- Special topics
- Condensing appliances and condensate handling are addressed in supplementary clauses; however, certain condensation-based applications and other appliance types (e.g., boiling water appliances, appliances for mechanical flue evacuation, dual space/water heaters) are either excluded or require additional requirements.
- Marking & documentation
- Labelling, instructions and warnings (including guidance from CEN/CR 1472).
Practical applications & users
Who uses EN 26:2023:
- Manufacturers and product designers ensuring compliance for gas-fired instantaneous water heaters.
- Test laboratories and certification bodies conducting type and conformity testing.
- Specifiers, installers and building services engineers selecting compliant units for residential and commercial sanitary hot water systems.
- Regulators and market surveillance authorities enforcing safety, energy efficiency and emission requirements.
Practical benefits:
- Ensures safe operation, reliable ignition and flame control.
- Defines testable criteria for energy performance and emissions.
- Provides a clear classification and marking framework for market access across Europe.
Related standards & references
- EN 26:2023 (identical text)
- EN 437 (test gases and pressures)
- CEN/TR 1749 (appliance type classification)
- CEN/CR 1472 (marking guidance)
- Gas Appliances Directive 2009/142/EC (essential safety requirements)
Keywords: EN 26:2023, gas-fired instantaneous water heaters, domestic hot water, EN 437, appliance classification, safety testing, energy efficiency, combustion emissions.
Frequently Asked Questions
EN 26:2023 is a standard published by the European Committee for Standardization (CEN). Its full title is "Gas-fired instantaneous water heaters for the production of domestic hot water". This standard covers: This European Standard defines the specifications and test methods concerning the construction, safety, rational use of energy and fitness for purpose, and also the classification and marking of gas-fired instantaneous water heaters for sanitary uses, hereafter called “water heaters”. This European Standard applies to water heaters: - of types AAS, B11, B11BS, B12, B12BS, B13, B13BS, B14, B22, B23, B32, B33, B44, B52, B53, C11, C12, C13, C21, C22, C23, C32, C33, C42, C43, C52, C53, C62, C63, C72, C73, C82and C83 according to CEN/TR 1749; - fitted with atmospheric burners; - equipped with atmospheric burners assisted by a fan for the supply of combustion air or evacuation of combustion products or fully premix burners; - using one or more combustible gases corresponding to the three gas families and at the pressures stated in accordance to EN 437; - of nominal heat input not exceeding 70 kW; - with an ignition burner or with direct ignition of the main burner. In this European Standard, the heat inputs are expressed in relation to the net calorific value (Hi). This European Standard does not contain all the requirements necessary for: - boiling water appliances; - appliances intended to be connected to a mechanical means of evacuating the combustion products; - appliances which fulfil a dual role of space heating and heating water for sanitary use; - appliances making use of the heat of condensation of the water contained in the combustion products; - water heaters of types B21, B31, B41, B42, B43 and B51. This European Standard only covers water heaters where the fan, if any, is an integral part of the appliance. This European Standard: - does not apply to appliances not intended to be connected to a flue when they are not fitted with an atmosphere sensing device; - takes account of the information given in Technical Report CEN/CR 1472:1994 with respect to marking. Type B appliances should be with a combustion products discharge safety device to comply with essential requirement 3.4.3 of the Gas Appliances Directive 2009/142/EC. In this European Standard, the appliance is identified as type B11BS. Appliances intended to be installed outdoors or in a room separate from inhabited rooms and provided with appropriate ventilation are not required to have this combustion products discharge safety device but, in this case, appropriate warnings on the packaging, and in the instructions should clearly define the limited authorized use for this type of appliance. In this European Standard, the appliance is identified as type B11. The main symbols used in this European Standard are summarized in Annex F.
This European Standard defines the specifications and test methods concerning the construction, safety, rational use of energy and fitness for purpose, and also the classification and marking of gas-fired instantaneous water heaters for sanitary uses, hereafter called “water heaters”. This European Standard applies to water heaters: - of types AAS, B11, B11BS, B12, B12BS, B13, B13BS, B14, B22, B23, B32, B33, B44, B52, B53, C11, C12, C13, C21, C22, C23, C32, C33, C42, C43, C52, C53, C62, C63, C72, C73, C82and C83 according to CEN/TR 1749; - fitted with atmospheric burners; - equipped with atmospheric burners assisted by a fan for the supply of combustion air or evacuation of combustion products or fully premix burners; - using one or more combustible gases corresponding to the three gas families and at the pressures stated in accordance to EN 437; - of nominal heat input not exceeding 70 kW; - with an ignition burner or with direct ignition of the main burner. In this European Standard, the heat inputs are expressed in relation to the net calorific value (Hi). This European Standard does not contain all the requirements necessary for: - boiling water appliances; - appliances intended to be connected to a mechanical means of evacuating the combustion products; - appliances which fulfil a dual role of space heating and heating water for sanitary use; - appliances making use of the heat of condensation of the water contained in the combustion products; - water heaters of types B21, B31, B41, B42, B43 and B51. This European Standard only covers water heaters where the fan, if any, is an integral part of the appliance. This European Standard: - does not apply to appliances not intended to be connected to a flue when they are not fitted with an atmosphere sensing device; - takes account of the information given in Technical Report CEN/CR 1472:1994 with respect to marking. Type B appliances should be with a combustion products discharge safety device to comply with essential requirement 3.4.3 of the Gas Appliances Directive 2009/142/EC. In this European Standard, the appliance is identified as type B11BS. Appliances intended to be installed outdoors or in a room separate from inhabited rooms and provided with appropriate ventilation are not required to have this combustion products discharge safety device but, in this case, appropriate warnings on the packaging, and in the instructions should clearly define the limited authorized use for this type of appliance. In this European Standard, the appliance is identified as type B11. The main symbols used in this European Standard are summarized in Annex F.
EN 26:2023 is classified under the following ICS (International Classification for Standards) categories: 91.140.65 - Water heating equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 26:2023 has the following relationships with other standards: It is inter standard links to EN 26:2015. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 26:2023 is associated with the following European legislation: EU Directives/Regulations: 2016/426, 812/2013, 814/2013; Standardization Mandates: M/534, M/535, M/BC/CEN/89/6. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase EN 26:2023 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2024
Nadomešča:
SIST EN 26:2015
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: EN 26:2023
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
97.100.20 Plinski grelniki Gas heaters
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 26
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 91.140.65 Supersedes 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 European Standard was approved by CEN on 8 May 2022.
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. 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 CEN
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 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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 26:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 12
4 Classification . 28
4.1 Gases and appliance categories . 28
4.2 Mode of air supply and evacuation of the combustion products . 28
4.3 Water pressure . 28
5 Constructional requirements . 28
5.1 Conversion to different gases . 28
5.1.1 General . 28
5.1.2 Permissible operations for changing gases . 29
5.2 Materials . 29
5.2.1 General requirements related to the use of materials in water heaters . 29
5.2.2 Materials in contact with water for human consumption . 30
5.2.3 Durability against corrosion of combustion product evacuation duct . 31
Table 1 — Metallic flue duct material specifications . 32
5.2.4 Disassembly, recycling and disposal . 32
5.2.5 Design - Assembly - Strength . 33
5.2.6 Accessibility - Ease of maintenance - Fitting and removal . 33
5.2.7 Connection to gas and water pipes . 33
5.2.8 Soundness . 34
5.2.9 Supply of combustion air and evacuation of the combustion products . 35
5.2.10 Checking the state of operation . 39
5.2.11 Drainage . 39
5.2.12 Electrical and electromagnetic safety . 39
5.2.13 Operational safety in the event of failure of the auxiliary energy . 40
5.3 Adjusting, control and safety devices . 41
5.3.1 General . 41
5.3.2 Shut off valves and/or gas rate adjusters . 41
5.3.3 Preset gas rate adjusters . 42
5.3.4 Gas pressure regulator . 43
5.3.5 Pressure test points. 43
5.3.6 Automatic water-operated gas valve . 43
5.3.7 Ignition devices . 43
5.3.8 Flame supervision device . 44
5.3.9 Atmosphere sensing device for type A appliances . 45
AS
5.3.10 Combustion products discharge safety device for type B , B and B
11BS 12BS 13BS
appliances . 46
5.3.11 Protection against accidental overheating of thermostatic appliances . 46
5.3.12 Composition of the gas circuit . 46
5.3.13 Protection for appliances intended to be installed in a partially protected place . 47
5.4 Main burner . 47
5.5 Supplementary requirements for condensing water heaters . 48
5.5.1 Materials in contact with condensate . 48
5.5.2 Discharge of condensate . 48
5.5.3 Control of the combustion products temperature . 48
5.5.4 Chemical composition of the condensate . 49
6 Operational requirements . 49
6.1 General . 49
6.1.1 Introduction. 49
6.1.2 Characteristics of the test gases . 49
6.1.3 Requirements for preparation of the test gases . 49
6.1.4 Choice of test gases . 49
6.1.5 Test pressures . 49
6.1.6 General test conditions . 49
6.2 Soundness . 54
6.2.1 Soundness of the gas circuit . 54
6.2.2 Soundness of the combustion circuit and evacuation of the combustion products . 55
Table 2 — Maximum admissible leakage rates . 57
6.2.3 Soundness of the water circuit. 61
6.3 Heat inputs . 61
6.3.1 General . 61
6.3.2 Nominal heat input. 63
6.3.3 Minimum heat input . 64
6.4 Temperature of the control knobs . 64
6.4.1 Requirements . 64
6.4.2 Test . 64
6.5 Temperature of the adjusting, control and safety devices . 64
6.5.1 Requirement . 64
6.5.2 Test . 64
6.6 Temperature of the appliance casing, the surface on which it is installed and
adjacent surfaces and external temperature of the ducts . 64
6.6.1 Requirements . 64
6.6.2 Tests . 65
6.7 Ignition - Cross-lighting - Flame stability . 66
6.7.1 Operation in still air for all appliances . 66
6.7.2 Supplementary tests for appliances of types A and B except for B . 67
AS 1 14
6.7.3 Supplementary tests for type C appliances and outdoors and/or partially protected
appliances. 68
6.7.4 Supplementary tests for type C appliances . 70
6.7.5 Supplementary tests for appliances of types C , C , C , C , B and B . 70
12 13 32 33 4 5
6.7.6 Supplementary tests for type C and type C appliances . 71
42 43
6.7.7 Supplementary tests for type C52 and type C53 appliances . 71
appliances . 71
6.7.8 Supplementary tests for type C6
6.7.9 Supplementary tests for type C and type C appliances . 71
72 73
6.7.10 Supplementary tests for type C and type C appliances . 71
82 83
6.7.11 Functioning of a permanent ignition burner when the fan stops during the standby
time . 72
6.7.12 Air proving device for fan assisted water heaters . 72
6.7.13 Functioning of the fan of types C and C water heaters . 75
42 43
6.7.14 Protection against the accumulation of gas in the combustion circuit for water
heaters equipped with a fan . 75
6.7.15 Leakage of combustion products from type C7 water heaters . 76
6.7.16 Supplementary tests for type B , B and B water heaters . 76
14 2 3
6.8 Adjusting, control and safety devices . 77
6.8.1 General . 77
6.8.2 Control devices . 77
6.8.3 Closing mechanisms . 77
6.8.4 Ignition devices . 79
6.8.5 Safety times . 80
6.8.6 Gas pressure regulator . 82
6.8.7 Adjustment of the water rate - Maximum water temperature (all appliances) . 83
6.8.8 Overheating of the water . 83
6.8.9 Effectiveness of the protection against accidental overheating of thermostatic
appliances . 84
6.8.10 Atmosphere sensing device for type A appliances . 84
AS
6.8.11 Combustion products discharge safety device of type B appliances . 86
11BS
Table 3 — Shutdown times in relation to blockage . 87
6.9 Combustion . 88
6.9.1 Requirements . 88
6.9.2 Test . 89
Table 4 — Percentage of CO . 89
6.9.3 Nitrogen oxides emissions . 93
Table 5 — Weighting factors . 94
6.10 Soot deposition . 95
6.10.1 Requirement . 95
6.10.2 Test . 95
6.11 Frost protection system for appliances intended to be installed in a partially
protected place . 96
6.12 Protection against ingress of rain for appliances intended to be installed in a
partially protected place . 96
6.13 Condensing water heaters . 96
6.13.1 Formation of condensate . 96
6.13.2 Temperature of combustion products . 97
6.14 Electrical power measurements . 97
6.14.1 General . 97
6.14.2 Nominal and minimal conditions . 97
6.14.3 Standby . 98
6.15 Measurement of standby heat losses . 98
7 Rational use of energy . 98
7.1 General . 98
7.2 Heat input of ignition burners . 98
7.2.1 Requirement . 98
7.2.2 Test . 98
7.3 Efficiency . 98
7.3.1 Requirement . 98
7.3.2 Test . 98
8 Fitness for purpose . 100
8.1 General . 100
8.2 Constructional characteristics . 100
8.2.1 Preset water rate adjuster . 100
8.2.2 Temperature selector and summer-winter switch. 100
8.2.3 Designation and measurement of reference temperatures of flue systems . 100
8.2.4 Mechanical resistance and stability of ducts, terminal and fitting pieces . 101
8.3 Requirements for plastic in the combustion product evacuation ducts, terminals and
fitting pieces for appliances . 102
8.3.1 Thermal resistance . 102
8.3.2 Materials . 103
Table 6 — Criteria for testing long-term resistance to thermal load . 104
Table 7 — Exposure time in weeks at raised temperatures. 104
Table 8 —Criteria for testing long-term resistance to condensate exposure . 105
Table 9 — Composition of test condensate for corrosion . 106
Table 10 — Criteria for testing resistance to condensing/ non- condensing cycling. 106
8.4 Requirements for elastomeric seals and elastomeric sealants in the combustion
product evacuation ducts, terminals and fitting pieces . 108
8.4.1 Characterization . 108
8.4.2 Long-term resistance to thermal load . 109
Table 11 — Criteria for testing long-term resistance to thermal load . 109
8.4.3 Long-term resistance to condensate exposure . 109
Table 12 — Criteria for testing-long term resistance to condensate exposure . 110
Table 13 — Condensate composition, related to construction classes . 110
8.4.4 Cyclic condensate resistance test . 110
8.4.5 Relaxation behaviour . 111
8.4.6 Compression set . 111
8.4.7 Low temperature resistance . 111
8.4.8 Joints in elastomeric seals . 112
8.5 Operational characteristics . 112
8.5.1 Minimum heat input . 112
8.5.2 Nominal and minimum useful outputs . 112
8.5.3 Ignition of permanent ignition burners by a spark generator . 112
8.5.4 Ignition opening time (T ) . 113
IA
8.5.5 Automatic water-operated gas valve . 113
8.5.6 Adjustment of the water rate - Water temperature . 114
Table 14 — Maximum permitted deviation for the water rate in relation to the mean rate . 115
8.5.7 Heating-up time . 118
Table 15 — Water temperature conditions depending on the control mode of the appliance . 119
8.5.8 Specific rate . 119
9 Marking and instructions . 120
9.1 Water heater marking . 120
9.1.1 Data plate . 120
9.1.2 Markings related to the state of adjustment . 121
9.1.3 Packaging . 121
9.1.4 Warnings notices on the water heater and the packaging . 122
9.1.5 Other information . 123
9.2 Instructions . 123
9.2.1 Instructions for installation . 123
9.2.2 Instructions for use and servicing . 129
9.2.3 Conversion instructions . 131
9.3 Presentation . 131
10 Nitrogen oxides emissions . 132
11 Sound power level (L ) . 132
WA
12 Figures referenced in this standard . 133
Figure 1 — Apparatus for verifying soundness of the gas circuit (see 6.1.6.5, 6.2.1.3 and
Annex E) . 133
Figure 2 — Test of an appliance of types B and B under abnormal draught conditions
11 11BS
(see 6.7.2.2, test n° 1) . 134
Figure 3 — Probe for sampling the combustion products of appliances of types B and B
11 11BS
(see 6.9.2.1) . 135
Figure 4 — Test of a type C appliance mounted on the common duct (see 6.7.4.2) . 136
Figure 5 — Position of the sampling points in the horizontal plane of the sealed room
(see 6.8.10.1.2.1 and Annex D) . 137
Figure 6 — Device for sampling the combustion products above the deflector for type A
AS
appliances (see 6.8.10.2.1.2 and 6.9.2.1) . 138
Figure 7 — Sampling probe for test flues of diameter equal to or greater than DN 100
(see 6.9.2.1) . 139
Figure 8 — Sampling probe for test flues of diameter less than DN 100 (see 6.9.2.1) . 140
Figure 9 — Probe for sampling and measuring the temperature of the combustion products
(see 6.9.2.1) . 141
Figure 10 — Location of the probe for type C appliances (see 6.9.2.1) . 142
Figure 11 — Combustion products discharge safety device for type B appliances
11BS
(see 6.8.11.4.2.1 and 6.8.11.4.2.2) . 143
Figure 12 — Down-draught test for the type C water heaters (see 6.7.9.2 and 6.9.2.4.10) . 144
Annex A (informative) National situations . 145
A.1 General . 145
A.2 Gas connections in common use in the various countries . 145
Table A.1 — Gas connections in common use . 146
A.3 Flue pipe diameters in force in the various countries . 148
Table A.2 — Flue pipe diameters marketed . 148
Annex B (normative) Test apparatus for type C , C , B and B water heaters (see 6.7.3.2) . 149
1 3 4 5
Figure B.1 — Test apparatus for type C , B and B water heaters fitted with a horizontal
1 4 5
terminal installed on a vertical wall . 149
Figure B.2 —Test apparatus for type C , B and B water heaters fitted with a horizontal
1 4 5
terminal installed on an inclined wall . 150
Figure B.3 —Test apparatus for type C , B and B water heaters fitted with a vertical
3 4 5
terminal installed on a horizontal wall . 151
Figure B.4 — Test apparatus for type C , B and B water heaters fitted with a vertical
3 4 5
terminal installed on an inclined wall . 152
Annex C (normative) Test apparatus for type C appliances (see 6.7.4.2) . 153
Annex D (normative) Description of the sealed room for the tests of type A appliances
AS
(see 6.8.10.1.2.1) . 154
D.1 Configuration of the sealed room . 154
D.2 Soundness of the room . 154
D.3 Effectiveness of mixing . 154
D.4 Equipment of the room . 154
Annex E (informative) Soundness of the gas circuit test - Volumetric method (6.2.1) . 155
E.1 Equipment . 155
E.2 Test method . 155
Annex F (informative) Principal symbols and abbreviations used . 156
Annex G (informative) Guidelines for extension to other appliances categories . 158
Annex H (normative) Lists of materials currently used for the construction of the gas water
heaters . 159
H.1 General . 159
H.2 Special types of steel . 159
Table H.1 — Special types of steel . 159
H.3 Copper and copper alloys . 159
Table H.2 — Copper and copper alloys . 159
H.4 Plastic materials . 160
Table H.3 — Examples of plastic materials . 160
Annex I (normative) Test methods to determine the effects of to long-term thermal load,
long-term condensate exposure, condensing/ non-condensing cycling and resistance
to UV radiation . 161
Annex J (informative) NO conversion calculation . 162
x
Table J.1 — Conversion of the emission value of NOx for first family gases . 162
Table J.2 — Conversion of the NOx emission value for second family gases . 162
Table J.3 — Conversion of the NOx emission value for third family gases . 162
Table J.4 — Table of Ratio Gross/Net and Net/Gross for Gas Families 1, 2 and 3 . 163
Annex K (normative) Parts in copper or copper alloys . 164
Table K.1 – Properties of parts in copper or copper alloys . 164
Annex L (informative) Compilation of the test conditions for the various gas families . 165
Table L.1 – First family . 165
Table L.2 – Second family . 165
Table L.3 – Third family . 166
Annex M (informative) Alternative Method for the determination of the nominal heat input
or the maximum and minimum heat input (according to 6.3.1) for appliances using a
pneumatic gas/air ratio control system . 167
Bibliography . 168
European foreword
This document (EN 26:202) has been prepared by Technical Committee CEN/TC 48 “Domestic gas-fired
water heaters”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2024, and conflicting national standards shall be
withdrawn at the latest by June 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 26:2015.
The main technical changes compared to EN 26:2015 are the following:
— New or generally reworded requirements:
— Separation between requirements and test methods in to different clauses;
— Moving common parts from EN 15502-1 series when relevant and applicable;
prEN 13203-2:2021 provides a means of conforming to the Commission Delegated Regulation (EU) No
812/2013 of 18 February 2013 supplementing Directive 2010/30/UE of the European Parliament and of
the Council with regard to energy labelling of water heaters, hot water storage tanks and packages of
water heaters and solar service, except on Sound power level (L ) covered by the present standard, see
WA
Clause 11.
prEN 13203-2:2021 provides a means of conforming to the Commission Regulation (EU) No 814/2013
of 2 August 2013 supplementing Directive 2009/125/EC of the European Parliament and of the Council
with regard to eco design requirements for water heaters and hot water storage tanks, except on nitrogen
oxides emissions (NO ) covered by the present standard, see Clause 10.
X
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Türkiye and the United
Kingdom.
1 Scope
This document defines the specifications and test methods and also the classification, marking and energy
labelling of gas-fired instantaneous water heaters for sanitary uses, hereafter called “water heaters”.
This document applies to water heaters:
— of types A B and C as described at the appropriated clauses;
,
NOTE For more information on the configuration of the types of appliances, see EN 1749:2020.
— using one or more combustible gases corresponding to the three gas families and at the pressures
stated in accordance to EN 437:2021;
— of nominal heat input not exceeding 77 kW based on the gross calorific value (GCV);
— with an ignition burner or with direct ignition of the main burner.
In this document, the heat inputs are expressed in relation to the net calorific value (Hi).
This document does not contain all the requirements necessary for:
— boiling water appliances;
— appliances intended to be connected to a mechanical means of evacuating the combustion products;
— appliances which fulfil a dual role of space heating and heating water for sanitary use.
T
...
The standard EN 26:2023 provides a comprehensive framework for gas-fired instantaneous water heaters designed for domestic hot water production. Its scope is notably broad, applying to an extensive range of water heater types with various configurations, including those fitted with atmospheric or fan-assisted burners. This inclusiveness ensures that manufacturers and users can refer to a uniform set of specifications and test methods, addressing critical aspects such as construction, safety, energy efficiency, and fitness for purpose. One of the strengths of EN 26:2023 is its detailed approach to safety requirements. By specifying the need for appliances to meet essential safety standards and providing clarification regarding different appliance types, the standard promotes the safe use of gas-fired water heaters. For instance, type B appliances, which necessitate a combustion products discharge safety device, reinforce compliance with the Gas Appliances Directive 2009/142/EC. This aspect not only helps guarantee user safety but also fosters consumer confidence in the performance and reliability of water heaters. The standard's emphasis on energy rationalization is another critical strength. By integrating specifications that address energy efficiency, EN 26:2023 aligns with contemporary energy standards and environmental goals. This focus reflects the increasing demand for energy-efficient systems in domestic applications and reiterates the relevance of the standard in today's market, where energy conservation is paramount. Furthermore, the inclusion of specific criteria for various types of gas-fired instantaneous water heaters-such as those working with different gas families and installation requirements-demonstrates the standard's thoroughness. Notably, while it delineates the scope of applicable appliances, it also clearly states exclusions, making it easier for stakeholders to navigate compliance requirements without ambiguity. In summary, EN 26:2023 stands out for its detailed specifications, robust safety measures, and emphasis on energy efficiency, ensuring that gas-fired instantaneous water heaters not only meet user needs but also contribute positively to overall safety and environmental sustainability. This standard remains highly relevant in the evolving landscape of domestic heating solutions.
Le document de normalisation SIST EN 26:2024, consacré aux chauffe-eau instantanés à gaz pour la production d'eau chaude domestique, présente une portée bien définie qui en fait une référence essentielle dans le secteur. Cette norme européenne établit des spécifications claires et des méthodes d'essai concernant la construction, la sécurité, l'utilisation rationnelle de l'énergie et l'aptitude à l'usage des chauffe-eau à gaz. Parmi ses forces, la norme EN 26:2023 se distingue par sa couverture exhaustive des différents types de chauffe-eau, incluant notamment les appareils équipés de brûleurs atmosphériques et ceux à pré-mélange. Elle aborde également les exigences relatives aux gaz combustibles utilisés, définissant des critères précis concernant les familles de gaz et les pressions spécifiques stipulées dans la norme EN 437. Cela garantit que les appareils fonctionnent de manière optimale tout en respectant les normes de sécurité. La norme s'intéresse également à la classification et au marquage des chauffe-eau, ce qui renforce la clarté pour les consommateurs et les professionnels de l'industrie. En outre, elle prend en compte les modalités spécifiques d'installation, en fournissant une directive utile pour les appareils devant être installés à l'extérieur ou dans des zones séparées d'espaces habités. Ces éléments témoignent de la pertinence de la norme dans le contexte actuel, où la sécurité et l'efficacité énergétique sont des priorités. Cependant, il est important de noter que la norme ne couvre pas tous les types d'appareils, tels que ceux destinés à faire bouillir de l'eau ou ceux ayant une double fonction de chauffage de l'eau et de chauffage d'espace. Ce choix délibéré permet de concentrer l’attention sur les chauffe-eau les plus courants pour un usage domestique, soulignant l'importance de la spécialisation dans les normes techniques. En somme, la norme EN 26:2023 apporte une contribution précieuse à la réglementation des chauffe-eau à gaz, en favorisant la sécurité, l'efficacité et la clarté dans un secteur en constante évolution. Ces caractéristiques en font une norme particulièrement pertinente pour les fabricants, distributeurs et utilisateurs de chauffe-eau instantanés à gaz.
SIST EN 26:2024 표준은 가스 연료로 작동하는 온수기의 안전성, 에너지 효율성 및 적합성에 대한 포괄적인 사양 및 시험 방법을 정의하고 있습니다. 이 표준은 특정 유형의 온수기를 대상으로 하여, AAS, B11, B12를 비롯한 다양한 형식의 기기에서의 적용 가능성을 보장합니다. 표준의 강점은 가스 연료 온수기의 구조와 기능을 명확히 정의하며, 소비자와 제조사 모두에게 필요한 정보와 지침을 제공합니다. 이 표준은 70 kW 이하의 열출력을 가지는 기기를 포함하여, 대기 연소기의 사용을 권장합니다. 이러한 세부 사항은 기기의 안전성과 효율성을 높이기 위한 중요한 기준으로 작용합니다. 또한, 가스 종류 및 압력에 대한 명확한 지침은 에너지의 합리적 사용을 촉진하는 데 기여합니다. SIST EN 26:2024는 가스 기기의 안전 지침과 기준에 매우 중요한 역할을 하며, 가스 기기의 안전성과 성능에 대한 신뢰를 구축하는 데 필수적인 요소입니다. 이 표준은 특정 사용 조건을 고려하여, 아웃도어 설치나 별도의 환기가 제공된 방에 설치할 수 있는 기기의 규정을 포함하고 있습니다. 이를 통해 사용자는 안전하게 기기를 사용할 수 있으며, 적절한 경고 및 지침이 제공됩니다. 결론적으로, SIST EN 26:2024 표준은 가스 연료 온수기의 설계 및 성능에 있어 필수적인 기준이자 지침을 제공하며, 안전하고 효율적인 가정용 온수기 사용을 위한 탄탄한 기초를 마련하고 있습니다. 이 표준은 에너지 효율성을 높이고, 가정의 안전을 증진시키는 데 있어 그 중요성이 강조됩니다.
Die Norm EN 26:2023 regelt die Anforderungen und Prüfmethoden für gasbeheizte Durchlauferhitzer, die zur Erzeugung von Warmwasser in Haushalten dienen. Der Anwendungsbereich dieser Europäischen Norm ist umfassend und deckt eine Vielzahl von Wärmeerzeugern ab, die durch spezifische Typenkennzeichnungen klassifiziert werden. Die Norm gilt insbesondere für Geräte, die mit atmosphärischen Brennern ausgestattet sind und auch solche, die durch einen Ventilator bei der Luftzufuhr oder der Abfuhr von Verbrennungsprodukten unterstützt werden. Ein herausragendes Merkmal der EN 26:2023 ist die klare Definition der sicherheitsrelevanten Aspekte und der rationalen Energienutzung. Die Norm stellt sicher, dass die Geräte einen nominalen Wärmeinput von maximal 70 kW nicht überschreiten, wodurch die Sicherheit und Effizienz der Wärmeerzeugung gefördert wird. Die Berücksichtigung des Nettokalorischen Wertes (Hi) zur Berechnung der Wärmeleistungen sorgt für eine transparente und nachvollziehbare Bewertung der Produkte. Ein weiterer Vorteil dieser Norm ist die detaillierte Kennzeichnung und Klassifizierung der Geräte, die für den Endverbraucher und die Hersteller gleichermaßen wichtig ist. Die Norm legt spezifische Anforderungen an die Markierung fest, die die Sicherheit und die korrekte Verwendung der Geräte unterstützen. Insbesondere die Einbeziehung von Sicherheitshinweisen für Typ B Geräte, die nicht für die Verbindung zu einem Schornstein vorgesehen sind und die Empfehlungen für die Installation in gut belüfteten Bereichen, unterstreicht deren Relevanz für die alltägliche Anwendung. Die EN 26:2023 berücksichtigt zudem bestehende technische Berichte, um sicherzustellen, dass alle relevanten Informationen zur sicheren Nutzung und Installation der Geräte bereitgestellt werden. Indem sie sich auf den rationalen Einsatz von Energie konzentriert, fördert diese Norm nicht nur die Sicherheit, sondern auch die Umweltverträglichkeit der Produkte. Dies stellt sicher, dass die Norm sowohl für Hersteller als auch für Verbraucher von großer Bedeutung ist, da sie dazu beiträgt, Qualitätsstandards in der Branche umzusetzen und zu erhalten. Insgesamt ist die Norm EN 26:2023 ein bedeutendes Dokument, das nicht nur den Anforderungen der Gesetzgeber entspricht, sondern auch einen wichtigen Beitrag zur Produktsicherheit und Energieeffizienz im Bereich der gasbeheizten Durchlauferhitzer leistet. Sie ist somit sowohl für die Industrie als auch für Endverbraucher von entscheidender Bedeutung.
SIST EN 26:2024は、家庭用温水の生産のためのガス-fired瞬間湯沸かし器に関して、構造、安全性、エネルギーの合理的使用、適合性についての仕様および試験方法を定義するヨーロッパの基準です。この標準は、さまざまなタイプの瞬間湯沸かし器に適用されるため、幅広い適用範囲を持っています。特にAAS、B11、B12、B13など、合計数十種類のタイプが明記されており、業界のさまざまなニーズを満たすことが可能です。 この標準の強みは、燃焼安全とエネルギー効率を重視した設計基準を定義している点にあります。これは、地域や国による異なるガスの特性に適応できるように、異なるガスファミリーや圧力に基づく適切な仕様を定めていることからも明らかです。また、最大70kWの熱入力を持つ機器をカバーしているため、住宅用途における効率的な温水供給に適した基準です。 さらに、この標準は、熱入力を正確にネット熱量（Hi）に基づいて表現することにより、燃焼効率を高めるための有益な情報を提供しています。このように、エコロジーや経済性を重視する現代の家庭における必要性を反映した内容です。 ただし、注意すべき点として、この標準は全てのボイラーや汎用機器には適用されません。特に、燃焼製品の排出に関するメカニズムが必要な機器や、暖房と温水供給の二重機能を持つ機器には該当しないため、特定の要件をクリアする必要があります。また、適切な換気が確保されている場合でも、必要な安全装置が省略できるという柔軟性を持ちながら、その使用法の制限については明確な表示を求めています。 全体として、SIST EN 26:2024は、ガス-fired瞬間湯沸かし器に関連する安全性、エネルギー効率、適合規格の面で重要な指針を提供する標準となっています。そのため、業界関係者や製造業者は、この標準を基にして製品の設計やマーケティング戦略を構築することが推奨されます。
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...