General Information

Abstract: Migrated from Progress Sheet (TC Comment) (2000-07-10): Has to consider also Directive 92/42 on efficiency of boilers !! ++ Exceptional derogation from IR granted in case of EN 297, allowing more than ++ 3 Amd. (but not more than 5) (BT 27/1996)

Status: Withdrawn
Publication Date: 21-May-1996
Withdrawal Date: 16-Sep-2026

ICS: 91.140.10 - Central heating systems

Technical Committee: CEN/TC 109 - Central heating boilers using gaseous fuels
Drafting Committee: CEN/TC 109 - Central heating boilers using gaseous fuels

Current Stage: 9960 - Withdrawal effective - Withdrawal
Start Date: 30-Jul-2014
Completion Date: 17-Sep-2026

Directive: Not Harmonized2009/142/EC - Appliances burning gaseous fuels
OJ Ref: C, C 349 OJ Date: 22-Dec-2010
: Not Harmonized90/396/EEC - Appliances burning gaseous fuels
OJ Ref: C, C 142, C 262 OJ Date: 29-Oct-2002
: Not Harmonized92/42/EEC - Efficiency requirements for new hot-water boilers fired with liquid or gaseous fuels

Mandate: M/066 - Standardization mandate to CEN concerning Efficiency requirements for boilers
Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels

Ref Project: SIST EN 297:1997/A2:1997 - Gas-fired central heating boilers - Type B11 and B11BS boilers, fitted with atmospheric burners of nominal heat input not exceeding 70 kW

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EN 297:1997/A2:1997

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Replaced By: EN 15502-2-2:2014 - Gas-fired central heating boilers - Part 2-2: Specific standard for type B1 appliances
Effective Date: 06-Aug-2014

Amends: EN 297:1994 - Gas-fired central heating boilers - Type B11 and B11BS boilers fitted with atmospheric burners of nominal heat input not exceeding 70 kW
Effective Date: 08-Jun-2022

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Amendment

EN 297:1997/A2:1997

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Frequently Asked Questions

What is EN 297:1994/A2:1996?

EN 297:1994/A2:1996 is a amendment published by the European Committee for Standardization (CEN). Its full title is "Gas-fired central heating boilers - Type B11 and B11BS boilers, fitted with atmospheric burners of nominal heat input not exceeding 70 kW". This standard covers: Migrated from Progress Sheet (TC Comment) (2000-07-10): Has to consider also Directive 92/42 on efficiency of boilers !! ++ Exceptional derogation from IR granted in case of EN 297, allowing more than ++ 3 Amd. (but not more than 5) (BT 27/1996)

What is the scope of EN 297:1994/A2:1996?

Migrated from Progress Sheet (TC Comment) (2000-07-10): Has to consider also Directive 92/42 on efficiency of boilers !! ++ Exceptional derogation from IR granted in case of EN 297, allowing more than ++ 3 Amd. (but not more than 5) (BT 27/1996)

What ICS categories does EN 297:1994/A2:1996 belong to?

EN 297:1994/A2:1996 is classified under the following ICS (International Classification for Standards) categories: 91.140.10 - Central heating systems. The ICS classification helps identify the subject area and facilitates finding related standards.

What standards are related to EN 297:1994/A2:1996?

EN 297:1994/A2:1996 has the following relationships with other standards: It is inter standard links to EN 15502-2-2:2014, EN 297:1994. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

Is EN 297:1994/A2:1996 a harmonized European standard?

EN 297:1994/A2:1996 is associated with the following European legislation: EU Directives/Regulations: 2009/142/EC, 90/396/EEC, 92/42/EEC; Standardization Mandates: M/066, 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.

How can I access EN 297:1994/A2:1996?

EN 297:1994/A2:1996 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)

EN 297:1997/A2:1997

SLOVENSKI STANDARD
01-marec-1997
3OLQVNLNRWOL]DFHQWUDOQRRJUHYDQMH7LSD%LQGHNV!LQ%LQGHNV%6!]
DWPRVIHUVNLPLJRULOQLNL]LPHQVNRPRþMRGRYNOMXþQRN:'RSROQLOR$
Gas-fired central heating boilers - Type B11 and B11BS boilers, fitted with atmospheric
burners of nominal heat input not exceeding 70 kW
Heizkessel für gasförmige Brennstoffe - Heizkessel der Typen B11 und B11BS mit
atmosphärischen Brennern mit einer Nennwärmebelastung kleiner als oder gleich 70 kW
Chaudieres de chauffage central utilisant les combustibles gazeux - Chaudieres des
types B11 et B11BS équipées de bruleurs atmosphériques, dont le débit calorifique
nominal est inférieur ou égal a 70 kW
Ta slovenski standard je istoveten z: EN 297:1994/A2:1996
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.100.20 Plinski grelniki Gas heaters
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
...

CEN

CEN/TS 15502-3-3:2026(Main)

Gas-fired central heating boilers - Part 3-3: 100 % Hydrogen - Expansion of EN 15502-2-1:2022

SIST-TS CEN/TS 15502-3-3:2026

Shall be according to EN 15502-2-1:2022+A1:2023, Clause 1 with the following modifications:
Replace:
“This document covers gas-fired central heating boilers from the types C1 up to C(11) and the types B2, B3 and B5:”
By:
“This document covers gas-fired central heating boilers from the types C1, C3 up to C9 and the types B2, B3 and B5 :”
b) is replaced by:
b) that use combustible gases of gas group 4Y at the nominal pressure of 20 mbar;
Appliance category Pn Pmin Pmax
4th family 20 17 25
k) is not applicable.
Add at the end of the list, after k), following:
l) which are fully premixed appliances equipped with a Pneumatic Gas/Air Ratio controller (PGAR) or an Adaptive Combustion Control Function (ACCF) that are intended to be connected to hydrogen gas grids where the quality of the distributed hydrogen gas is likely expected to stay within a Wobbe index range of 42 to 46 MJ/m3.
Replace in the list following
“This document does not cover all the requirements for:”
ab), ag), ah) and al) by:
ab) appliances that are intended to be connected to gas grids where the quality of the distributed hydrogen gas is likely to vary outside the Wobbe index range of 42 to 46 MJ/m3;
ag) C(10) boilers;
ah) C(11) boilers;
al) Partially premixed appliances equipped with an adaptive combustion control function (ACCF).
and add an) and ao);
an) The conversion from natural gas to hydrogen.
ao) The risk of aeration of the gas supply to the appliance.

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CEN

EN 15502-2-1:2022+A1:2023/AC:2024(Corrigendum)

Gas-fired central heating boilers - Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW

SIST EN 15502-2-1:2022+A1:2024/AC:2025

Corrigendum
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CEN

EN 15502-2-2:2024(Main)

Gas-fired central heating boilers - Part 2-2: Specific standard for type B1 appliances

SIST EN 15502-2-2:2025

This document specifies, the requirements and test methods concerning the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners and are hereafter referred to as “boilers”.
Where the word boiler is used, this is intended to be read as the boiler including its connecting ducts, ducts and terminals, if any.
This document covers gas-fired central heating boilers type B11, B11BS, B12, B12BS, B13, B13BS:
NOTE 1   For further background information on appliance types see EN 1749:2020.
a)   that have a nominal heat input (on the basis of net calorific value) not exceeding 70 kW;
b)   that use one or more combustible gases of the three gas families at the pressures stated in EN 437:2021;
c)   where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;
d)   where the maximum operating pressure in the water circuit does not exceed 6 bar;
e)   which are declared in the technical instructions to be either a “low temperature boiler” or a “standard boiler”. If no declaration is given the boiler is to be considered a “standard boiler”;
f)   which are intended to be installed inside a building or in a partially protected place;
g)   which are intended to produce also hot water either by the instantaneous or storage principle, as a single unit;
h)   which are designed for either sealed water systems or for open water systems.
NOTE 2   This document provides requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this document, the risk associated with this alternative construction needs to be assessed.
An example of an assessment methodology, based upon risk assessment, is given in Clause 11.
This document does not cover all the requirements for:
aa)   appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex AB);
ab)   appliances using flue dampers;
ac)   appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW;
ad)   appliances of the types A, B14, B¬2, B3, B4, B5 and C;
ae)   appliances intended to be connected to a (common) flue having mechanical extraction;
af)   appliances with gas/air ratio control;
ag)   modular boilers;
ah)   boilers which can give rise to condensation under certain circumstances;
ai)   boilers intended to be installed in a room with a foreseeable negative pressure relative to the pressure in the flue system;
aj)   surface temperatures of external parts particular to children and elderly people;
ak)   appliances that are intended to burn natural gases of the second family where hydrogen is added to the natural gas;
al)   boilers intended to be installed in areas accessible to elderly people and children;
am)   boilers equipped with an adaptive combustion control function (ACCF).
NOTE   Negative pressure relative to the pressure in the flue system can for example be caused by mechanical or thermal ventilation in airtight buildings.

Standard
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CEN

CEN/TS 15502-3-1:2024(Main)

Gas-fired central heating boilers - Part 3-1: H2NG and ACCF - Expansion of EN 15502-2-1:2022

SIST-TS CEN/TS 15502-3-1:2025

Scope of CEN/TS 15502-3-1
EN 15502-2-1:2022, Clause 1 applies with the following modifications:
Add after k):
l) which are fully premixed appliances equipped with an Adaptive Combustion Control Function (ACCF) that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance including gas grids for natural gases of the second family where up to 20% hydrogen volume is added to the natural gas (H2NG-Y20).
m) which are fully premixed appliances equipped with a Pneumatic Gas Air Ratio controller (PGAR) that are intended to be connected to gas grids for natural gases of the second family where up to 20% hydrogen volume is added to the natural gas (H2NG-Y20), where the quality of the distributed gas without adding the hydrogen is not likely to vary to a large extent over the lifetime of the appliance.
Replace ab) and ak) and al) by the following:
ab) appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex AB of EN 15502-1:2021), except for fully premixed appliances with a ACCF, as ACCF appliances are designed to adapt to variations in gas quality.
ak) appliances that are intended to burn natural gases of the second family where hydrogen is added to the natural gas, except for fully premixed appliances with a ACCF or PGAR (which are covered by this document);
al) Partially premixed appliances equipped with an adaptive combustion control function (ACCF).

Technical specification
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CEN

EN 15502-2-1:2022+A1:2023(Main + Amendment)

Gas-fired central heating boilers - Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW

SIST EN 15502-2-1:2022+A1:2024

This document specifies the requirements and test methods, as well as the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners or fully premixed burners, and are hereafter referred to as "boilers".
This document is intended to be used in conjunction with EN 15502-1:2021.
This document covers gas-fired central heating boilers from the types C1 up to C(11) and the types B2, B3 and B5:
NOTE 1   For further background information on appliance types see EN 1749:2020.
a)   that have a nominal heat input (on the basis of net calorific value) not exceeding 1 000 kW;
b)   that use one or more combustible gases of the three gas families at the pressures stated in EN 437:2021;
c)   where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;
d)   where the maximum operating pressure in the water circuit does not exceed 6 bar;
e)   which can give rise to condensation under certain circumstances;
f)   which are declared in the instructions for installation to be either a "condensing" boiler or a "low temperature boiler" or a "standard boiler"; if no declaration is given the boiler is to be considered a "standard boiler";
g)   which are intended to be installed inside a building or in a partially protected place;
h)   which are intended to produce also hot water either by the instantaneous or storage principle as a single unit;
i)   which are designed for either sealed water systems or for open water systems;
j)   which are either modular boilers, or non-modular boilers.
k)   which are from the types C(10) that are equipped with a gas-air ratio control and that have a ∆pmax, saf(min) of 25 Pa, and C(11) that have condensing boiler modules that are equipped with a gas-air ratio control and that have a ∆pmax, saf(min) of 25 Pa.
NOTE 2   This document provides requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this standard, the risk associated with this alternative construction needs to be assessed.
An example of an assessment methodology, based upon risk assessment, is given in Clause 11.
This document does not cover all the requirements for:
aa)   appliances above 1 000 kW;
ab)   appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex AB of EN 15502-1:2021);
ac)   appliances using flue dampers;
ad)   appliances of the types B21, B31, B51, C21, C41, C51, C61, C71, C81, C(12) and C(13);
ae)   C7 appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW;
af)   appliances incorporating flexible plastic flue liners;
ag)   C(10) boilers:
1)   without a gas-air ratio control, or
2)   which are non-condensing appliances, or
3)   which have a maximum safety pressure difference at minimum heat input not equal to 25 Pa (∆pmax, saf(min));
ah)   C(11) boilers that have boiler modules:
1)   without a gas-air ratio control, or
2)   which are non-condensing appliances, or
3)   which have a maximum safety pressure difference at minimum heat input not equal to 25 Pa (∆pmax, saf(min));
ai)   appliances intended to be connected to a flue having mechanical extraction;
aj)   surface temperatures of external parts particular to children and elderly people;
ak)   appliances that are intended to burn natural gases of the second family where hydrogen is added to the natural gas;
al)   appliances equipped with an adaptive combustion control function (ACCF);
am)   boilers intended to be installed in areas accessible to elderly people and children.

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CEN

EN 15502-1:2021+A1:2023(Main + Amendment)

Gas-fired heating boilers - Part 1: General requirements and tests

SIST EN 15502-1:2022+A1:2024

This European Standard specifies the common requirements and test methods, as well as the classification, marking and energy labelling of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners or fully premixed burners, and are hereafter referred to as “boilers”.
This European Standard is to be used in conjunction with the specific Parts 2 (Part 2-1 and following ones).
This European Standard applies to boilers of types B and C.
NOTE For further background information on appliance types see CEN/TR 1749:2014 [1].
a) that use one or more combustible gases of the three gas families at the pressures stated in EN 437;
b) where the temperature of the water is below or above 105 °C during normal operation;
c) where the maximum operating pressure in the water circuit does not exceed 6 bar;
d) which can give rise to condensation under certain circumstances;
e) which are declared in the instructions for installation to be either a "condensing" boiler or a "low temperature boiler" or a "standard boiler" or an "other boiler". If no declaration is given the boiler is to be considered both a "standard boiler" and an "other boiler";
NOTE The Ecodesign Directive defines "other boilers", "low temperature boilers" and "condensing boilers". The Boiler Efficiency Directive defines "standard boilers", "low temperature boilers" and "condensing boilers". Depending on the legislation applied, a boiler can be both "a standard boiler" and an "other boiler"."
f) which are intended to be installed inside a building or in a partially protected place;
g) which are intended to produce also hot water either by the instantaneous or storage principle as a single unit.
This European Standard applies to boilers designed for sealed water systems or for open water systems.
NOTE This general standard and the specific standards (see Part 2) provide requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this standard or a specific standard, the risk associated with this alternative construction will need to be assessed.
An example of an assessment methodology, based upon risk assessment, is given in Clause 11.
This European Standard is not intended to cover appliances intended for connection to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex EE).
This European Standard is not intended to cover appliances designed and constructed to burn gas containing toxic components.

Standard
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CEN

EN 15502-2-3:2023(Main)

Gas-fired central heating boilers - Part 2-3: Specific standard for hybrid units combining a gas-fired boiler and an electrical heat pump in a product

SIST EN 15502-2-3:2024

This document specifies the requirements and tests methods concerning the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of hybrid units.
A hybrid unit is composed of:
-   a gas boiler as a heat generator which is able to supply the heat demand in all operating conditions;
-   an electrical air-to-water heat pump, as a heat generator, which does not have to meet the heat demand in all operating conditions;
-   a control unit (see definition 3.1.10).
A hybrid unit can include the facility to produce hot water, either by the instantaneous or storage principle, the whole being marketed as a single unit.
A gas boiler as part of a hybrid unit covered by this document is a gas-fired central heating boiler from the types C1 up to C9 and the types B2, B3 and B5, according to the classification in EN 1749:2020:
a)   that have a nominal heat input (on the basis of gross calorific value) not exceeding 400 kW;
b)   that use one or more combustible gases of the three gas families at the pressures stated in EN 437:2021;
c)   where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;
d)   where the maximum operating pressure in the water circuit does not exceed 6 bar;
e)   which are classified as a gas-fired central heating boiler;
f)   which are intended to be installed either indoors or outdoors in a partially protected place;
g)   which are designed for either sealed water systems or for open water systems.
This document provides requirements for boilers with known constructions.
NOTE 1   For boilers with any alternative constructions, which might not fully be covered by this document, the risk associated with this alternative construction needs to be assessed.
NOTE 2   An example of an assessment methodology, based upon risk assessment and which covers the essential requirements of the Gas Appliance Regulation UE/426/2016, is given in Clause 11.
This document does not cover all the requirements for:
aa)   appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see EN 15502-1:2021, Annex AB);
ab)   appliances using flue dampers;
ac)   appliances of the types B21, B31, B51, C21, C41, C51, C61, C71 and C81;
ad)   appliances incorporating flexible plastic flue liners;
ae)   appliances designed to become connected to a combined flue duct system.
af)   appliances of the types C(10),C(11), C(12) and C(13);
ag)   C7 appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW;
ah)   appliances intended to be connected to a flue having mechanical extraction;
ai)   surface temperatures of external parts particular to children and elderly people;
aj)   appliances that are intended to burn natural gases of the second family where hydrogen is added to the natural gas;
ak)   appliances equipped with an adaptive combustion control function (ACCF);
al)   boilers intended to be installed in areas accessible to elderly people and children.
This document specifies minimum operating requirements which ensure that the products are fit for the use designated by the technical instructions when used for space heating and/or DHW production.
This document is intended to be used in conjunction with:
ba)   the gas-fired boiler, the generic part EN 15502-1:2021 and specific parts FprEN 15502-2-1:2022 and FprEN 15502-2-2:2022;
bb)   the electrical heat pump, EN 14511-4:2018, EN 378-1:2016+A1:2020, EN 378-2:2016 and EN 14825:2022;
bc)   electrical safety, EN 60335-1:2012 , EN 60335-2-102:2016 and IEC 60335-2-40:2018;
bd)   for domestic hot water production, EN 13203-5:2022.

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CEN

EN 303-7:2006(Main)

Heating boilers - Part 7: Gas-fired central heating boilers equipped with a forced draught burner of nominal heat output not exceeding 1 000 kW

SIST EN 303-7:2007

This European Standard specifies the requirements and test methods for the construction, the safety and the rational energy usage for gas-fired central heating boilers equipped with a forced draught burner. These boilers are formed of the assembly of a boiler body and a forced draught gas burner achieved on the production site of the manufacturer, the whole being designed and marketed as a complete boiler. The boiler body shall be in accordance with EN 303-1. The construction of the forced draught gas burner shall be in accordance with EN 676.

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CEN

EN 303-3:1998/AC:2006(Corrigendum)

Heating boilers - Part 3: Gas-fired central heating boilers - Assembly comprising a boiler body and a forced draught burner

SIST EN 303-3:1999/AC:2006

TC - Replace Tables 5 and 6

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CEN

EN 303-3:1998/A2:2004(Amendment)

Heating Boilers - Part 3 : Gas-fired heating boilers - Assembly comprising a boiler body and a forced draught burner

SIST EN 303-3:1999/A2:2004

Replace the second paragraph by the following text :
"This European Standard applies to standard boilers and low-temperature boilers with a nominal heat output not exceeding 1000 kW and with a water temperature at normal operation not exceeding 105 °C."
Replace the 2nd dash of the third paragraph by the following text :
"- condensing boilers;"
Delete the last but one paragraph of EN 303-3 :
"This European Standard does not contain all the necessary requirements for low temperature boilers. Nevertheless, the testing methods defined by this European Standard for the determination of useful efficiencies can be used for low temperature boilers, after being adapted in accordance with annex H."

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General Information

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EN 297:1997/A2:1997

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