2016/426 - REGULATION (EU) 2016/426 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC Harmonized Directive

This document applies to gas appliances intended for outdoor use capable of working with gases of the second family or second and third family.
This document does not apply to appliances intended for commercial purposes.
The scope of this document is the same as the scope of the product standards developed by the European Technical Committee CEN/TC 181 covering the same type of appliance but limited to the use of liquefied petroleum gases, hereinafter referred to as ‘the product standard’.
This standard is applicable in addition to the product standards developed by CEN/TC 181 covering LPG dedicated appliances. For example, the product standards are:
-   for an independent cooktop: EN 484;
-   for multi-purpose boiling burners: EN 497;
-   for a barbecue or griddle: EN 498;
-   for a patio heater: EN 14543;
-   flueless non-domestic space heaters: EN 461.
This document does not apply to appliances under the scope of EN 449.
This document does not apply to appliances fitted with a gas pressure governor.
This document specifies the manufacturing, and marking requirements and establish the testing method of appliances prior to their placing on the market and during further assessments.
This document does not apply for changing the appliance category of an appliance already put on the market.
This document specifies the modifications of the appliances allowed to change the type of gas to be used depending of its gas category.
This document does not apply to appliances burning liquefied petroleum gases at the vapour pressure within the gas cartridge or gas cylinder.

This European Standard specifies the construction and performance characteristics as well as the requirements and methods of test for the safety and marking of domestic cooking appliances, capable of using the combustible gases defined in EN 30-1-1:2008+A2:2010, that have one or more burners with an automatic burner control system, referred to in the text as "appliances".
This European Standard includes specific requirements and methods of test that are applicable to burners having an automatic burner control system, whether or not the appliance is equipped with a fan for the supply of combustion air to, and/or the evacuation of the products of combustion from the burner concerned. These specific requirements and methods of test are only applicable when the burner has an automatic burner control system and do not apply to burners having automatic ignition that fall within the scope of
EN 30-1-1:2008+A2:2010.
This European Standard is intended to be used in conjunction with EN 30-1-1:2008+A2:2010 and, where appropriate, other parts of EN 30-1 covering appliances having:
-   forced-convection ovens and/or grills;
-   a glass ceramic hotplate.
It does not cover all of the safety requirements and methods of test that are specific to forced-convection ovens and/or grills and glass ceramic hotplates.
Unless specifically excluded hereafter, this standard applies to these appliances or their component parts, whether or not the component parts are independent or incorporated into a single appliance, even if the other heating components of the appliance use electrical energy (e.g. combined gas-electric cookers).
This European Standard includes requirements covering the electrical safety of equipment incorporated in the appliance that is associated with the use of gas. It does not include requirements covering the electrical safety of electrically heated component parts of their associated equipment ).
This European Standard does not apply to:
-   outdoor appliances;
-   appliances connected to a combustion products evacuation duct;
-   appliances having a pyrolytic gas oven;
-   appliances having automatic burner control systems that:
-   have a second safety time (see EN 298:2003), or
-   control one or more burners that incorporate a separate ignition burner;
-   appliances having an uncovered burner or a non-enclosed covered burner (see 3.1.1) that utilises a fan for the supply of its combustion air;
-   appliances having enclosed covered burners that are not equipped with an automatic burner control system;
-   appliances having one or more burners that are capable of remote operation (type1), unless the burner(s) concerned are:
-   oven burners equipped with an automatic burner control system, or
-   oven burners of time-controlled ovens that are designed for a delayed start without the user being present;
-   appliances having one or more burners that are capable of remote operation (type 2), unless the burner(s) concerned are:
-   oven, grill or hotplate burners equipped with automatic burner control systems, or
-   oven burners of time-controlled ovens that are designed for a delayed start without the user being present;
-   appliances supplied at pressures greater than those defined in 7.1.3;
-   appliances equipped with air-gas ratio controls;
-   appliances incorporating one or more hotplate or grill burners that enable the user to program the delayed start of a cooking cycle.
This European Standard does not cover the requirements relating to automatic on-off cycling multi-ring hotplate burners for which specific requirements are under consideration.
This European Standard does not cover the requirements relating to third family gas cylinders, their regulators and their connection.
This European Standard only covers type testing.

This document applies to gas appliances intended for outdoor use capable of working with gases of the second family or second and third family.
This document does not apply to appliances intended for commercial purposes.
The scope of this document is the same as the scope of the product standards developed by the European Technical Committee CEN/TC 181 covering the same type of appliance but limited to the use of liquefied petroleum gases, hereinafter referred to as ‘the product standard’.
This standard is applicable in addition to the product standards developed by CEN/TC 181 covering LPG dedicated appliances. For example, the product standards are:
-   for an independent cooktop: EN 484;
-   for multi-purpose boiling burners: EN 497;
-   for a barbecue or griddle: EN 498;
-   for a patio heater: EN 14543;
-   flueless non-domestic space heaters: EN 461.
This document does not apply to appliances under the scope of EN 449.
This document does not apply to appliances fitted with a gas pressure governor.
This document specifies the manufacturing, and marking requirements and establish the testing method of appliances prior to their placing on the market and during further assessments.
This document does not apply for changing the appliance category of an appliance already put on the market.
This document specifies the modifications of the appliances allowed to change the type of gas to be used depending of its gas category.
This document does not apply to appliances burning liquefied petroleum gases at the vapour pressure within the gas cartridge or gas cylinder.

EN 13611:2019, Clause 1 is applicable with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for multifunctional controls for burners and appliances burning one or more gaseous fuels, hereafter referred to as ‘MFC’. This document is applicable to MFCs with declared maximum inlet pressures up to and including 50 kPa and nominal connection sizes up to and including DN 150.
Addition:
This document is applicable to MFCs consisting of two or more functions, at least one of which is a mechanical control, as specified in the relevant control standard (see Figure 1).
This document does not apply to MFCs consisting only of electronics (an example is a combination of functions according to EN 298:2022 and EN 1643:2022).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for automatic shut-off valves for burners and appliances burning one or more gaseous fuels, hereafter referred to as “valves”.
This document is applicable to valves with declared maximum inlet pressures up to and including 500 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
-   electrically actuated valves;
-   valves actuated by fluids where the control valves for these fluids are actuated electrically, but not to any external electrical devices for switching the control signal or actuating energy;
-   valves where the flow rate is controlled by external electrical signals, either in discrete steps or proportional to the applied signal;
-   valves fitted with closed position indicator switches.
An assessment method for valve designs is given by this document.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 is applicable with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for multifunctional controls for burners and appliances burning one or more gaseous fuels, hereafter referred to as ‘MFC’. This document is applicable to MFCs with declared maximum inlet pressures up to and including 50 kPa and nominal connection sizes up to and including DN 150.
Addition:
This document is applicable to MFCs consisting of two or more functions, at least one of which is a mechanical control, as specified in the relevant control standard (see Figure 1).
This document does not apply to MFCs consisting only of electronics (an example is a combination of functions according to EN 298:2022 and EN 1643:2022).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for automatic shut-off valves for burners and appliances burning one or more gaseous fuels, hereafter referred to as “valves”.
This document is applicable to valves with declared maximum inlet pressures up to and including 500 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
-   electrically actuated valves;
-   valves actuated by fluids where the control valves for these fluids are actuated electrically, but not to any external electrical devices for switching the control signal or actuating energy;
-   valves where the flow rate is controlled by external electrical signals, either in discrete steps or proportional to the applied signal;
-   valves fitted with closed position indicator switches.
An assessment method for valve designs is given by this document.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

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.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
automatic vent valves for burners and appliances burning one or more gaseous fuels, hereafter referred
to as “valves”.
This document is applicable to valves with declared maximum inlet pressures up to and including
500 kPa and of nominal connection sizes up to and including DN 100.
Addition:
This document is applicable to:
— electrically actuated valves;
— valves actuated by fluids where the control valves for these fluids are actuated electrically, but not to
any external electrical devices for switching the control signal or actuating energy;
— valves fitted with open position indicator switches.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
pneumatic pressure regulators and safety devices for burners and appliances burning one or more
gaseous fuels, hereafter referred to as “pressure regulators”.
This document is applicable to pressure regulators with declared maximum inlet pressures above 50 kPa
up to and including 500 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
— pressure regulators incorporating safety devices;
— pressure regulators and safety devices which use auxiliary energy;
— stand-alone pressure regulators or pressure regulators equipped with a control device for maximum
or minimum gas pressure.
This document is not applicable to:
— pressure regulators connected directly to a gas distribution network or to a container that maintains
a standard distribution pressure;
— pressure regulators intended for gas appliances to be installed in the open air and exposed to the
environment.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
thermoelectric flame supervision devices, energized by a thermocouple intended for use with burners
and appliances burning one or more gaseous fuels, hereafter referred to as “controls”.
This document is applicable to controls with declared maximum inlet pressures up to and including
500 kPa and of nominal connection sizes up to and including DN 50.
Addition:
This document is not applicable to:
— the thermocouple;
— controls which use auxiliary energy (e.g. electrical energy supplied externally).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
electronic pressure and/or flow rate regulators for burners and appliances burning one or more gaseous
fuels, hereafter referred to as “regulators”.
This document is applicable to regulators with declared maximum inlet pressures up to and including
500 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
— regulators which use auxiliary energy;
— regulators, which function by controlling a gas outlet pressure or a gas flow rate;
— regulators with a modular structure specified as a unit;
— regulators intended for gas appliances to be installed indoor or in the open air and exposed to the
environment.
This document is not applicable to:
— regulators connected directly to a gas distribution network or to a container that maintains a
standard distribution pressure.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

This document specifies the requirements and the methods of test for the rational use of energy of gas burning domestic cooking appliances, in accordance with EN 30-1-1:2021+A1:2023, Clause 1.

This document specifies the requirements and test methods for the construction, safety, and marking of decorative fuel effect gas appliances not exceeding a nominal heat input of 20 kW (based on the net calorific value), thereafter referred to as appliances.
This document is applicable to appliances that are designed to simulate a solid fuel fire and incorporate a natural draught burner with or without an ignition burner, that uses one or more combustible gases of the three gas families at the pressures stated in EN 437:2021. The appliances are for decorative purposes only and are not heating appliances.
This document is applicable to type BAS, as described in 4.2, decorative fuel effect gas appliances that are designed to be installed within a non-combustible builder's opening or a non-combustible fireplace recess.
NOTE 1   This document specifies special national conditions in Annex C for appliances of category I2E+, marketed in Belgium.
NOTE 2   This document specifies special A-deviations in Annex D for appliances in Switzerland which require additional requirements for subclauses 6.6 and 6.7.
This document includes additional requirements for Type BBS appliances which are specified in Annex F.
In addition, this document is applicable to decorative fuel-effect gas appliances that are designed to be installed under a non-combustible canopy which is independent or integral with a flue box, for which additional requirements are specified in Annex A.
The use of toxic gases is not covered.
This document is not applicable to:
-   catalytic combustion appliances;
-   appliances in which the supply of combustion air and/or the evacuation of products of combustion is achieved by mechanical means.
NOTE 3   Requirements concerning the rational use of energy have not been included in this document, because the appliances are for decorative purposes.

This document specifies the requirements and the methods of test for the rational use of energy of gas burning domestic cooking appliances, in accordance with EN 30-1-1:2021+A1:2023, Clause 1.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
pneumatic pressure regulators and safety devices for burners and appliances burning one or more
gaseous fuels, hereafter referred to as “pressure regulators”.
This document is applicable to pressure regulators with declared maximum inlet pressures above 50 kPa
up to and including 500 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
— pressure regulators incorporating safety devices;
— pressure regulators and safety devices which use auxiliary energy;
— stand-alone pressure regulators or pressure regulators equipped with a control device for maximum
or minimum gas pressure.
This document is not applicable to:
— pressure regulators connected directly to a gas distribution network or to a container that maintains
a standard distribution pressure;
— pressure regulators intended for gas appliances to be installed in the open air and exposed to the
environment.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
thermoelectric flame supervision devices, energized by a thermocouple intended for use with burners
and appliances burning one or more gaseous fuels, hereafter referred to as “controls”.
This document is applicable to controls with declared maximum inlet pressures up to and including
500 kPa and of nominal connection sizes up to and including DN 50.
Addition:
This document is not applicable to:
— the thermocouple;
— controls which use auxiliary energy (e.g. electrical energy supplied externally).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
electronic pressure and/or flow rate regulators for burners and appliances burning one or more gaseous
fuels, hereafter referred to as “regulators”.
This document is applicable to regulators with declared maximum inlet pressures up to and including
500 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
— regulators which use auxiliary energy;
— regulators, which function by controlling a gas outlet pressure or a gas flow rate;
— regulators with a modular structure specified as a unit;
— regulators intended for gas appliances to be installed indoor or in the open air and exposed to the
environment.
This document is not applicable to:
— regulators connected directly to a gas distribution network or to a container that maintains a
standard distribution pressure.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
automatic vent valves for burners and appliances burning one or more gaseous fuels, hereafter referred
to as “valves”.
This document is applicable to valves with declared maximum inlet pressures up to and including
500 kPa and of nominal connection sizes up to and including DN 100.
Addition:
This document is applicable to:
— electrically actuated valves;
— valves actuated by fluids where the control valves for these fluids are actuated electrically, but not to
any external electrical devices for switching the control signal or actuating energy;
— valves fitted with open position indicator switches.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

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.

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.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for gas filters for burners and appliances burning one or more gaseous fuels.
This document is applicable to gas filters with declared maximum inlet pressures up to and including 600 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is not applicable to:
-   gas filters that are connected directly to mains pipe-work or to a container that maintains a standard distribution pressure.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
mechanical thermostats intended for use with gas appliances and similar use, hereafter referred to as
“thermostats”.
This document is applicable to thermostats with declared maximum inlet pressures up to and including
50 kPa and of nominal connection sizes up to and including DN 50 for use with one or more fuel gases.
Addition:
This document is applicable to thermostats controlling the gas flow directly or indirectly through an
integral gas valve. This document applies to thermostats used with gas appliances which are not installed
in the open air.
Thermostats dealt with in this document are intended for control functions.
This document is not applicable to:
a) controls which use auxiliary energy (e.g. electrical energy supplied externally);
b) an assessment of the control regarding Performance Level (PL) and Safety Integrity Level (SIL).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
pressure regulators and pneumatic gas/air ratio pressure regulators (zero pressure regulators are
included as a special type of pneumatic gas/air ratio pressure regulators) for burners and appliances
burning one or more gaseous fuels, hereafter referred to as “pressure regulators”.
This document is applicable to pressure regulators with declared maximum inlet pressures up to and
including 50 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
— pressure regulators which use auxiliary energy;
— pneumatic gas/air ratio pressure regulators, which function by controlling a gas outlet pressure in
response to an air signal pressure, air signal differential pressure, and/or to a furnace pressure signal
(zero pressure regulators are included as a special type of pneumatic gas/air ratio pressure
regulators);
— pneumatic gas/air ratio pressure regulators, which change an air outlet pressure in response to a gas
signal pressure or a gas signal differential pressure.
This document is not applicable to:
— pressure regulators connected directly to a gas distribution network or to a container that maintains
a standard distribution pressure;
— pressure regulators intended for gas appliances to be installed in the open air and exposed to the
environment;
— mechanically linked gas/air ratio controls;
— electronic gas/air ratio controls (EN 12067-2:2022).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

This European Standard specifies the special constructional and operational characteristics, as well as the requirements and methods of test for safety and marking, for domestic cooking appliances having forced-convection ovens and /or grills using combustible gases, as defined in EN 30-1-1:2008+A2:2010.
Unless specifically excluded, this European Standard applies to appliances or their component parts, whether the component parts are independent or incorporated as part of the appliance, even if the other heating components use electrical energy (for example combined gas-electric cookers).
This European Standard includes requirements covering the electrical safety of equipment incorporated in the appliance that are associated with the use of gas. It does not include requirements covering the electric safety of electrically-heated components or their associated equipment1).
This European Standard does not apply to:
- outdoor appliances;
- appliances connected to a combustion products evacuation duct;
- appliances having a pyrolytic gas oven;
- appliances having covered burners which do not comply with the constructional requirements
of EN 30-1-1:2008+A2:2010, 5.2.8.2.2;
- appliances incorporating flame supervision devices and having an automatic ignition device for which the duration of the ignition attempt is limited by design;
- appliances equipped with a burner that is periodically ignited and extinguished under the control of an automatic on/off device;
- appliances equipped with a burner having a fan for the supply of combustion air or for the evacuation of the products of combustion;
- appliances supplied at pressures greater than those defined in EN 30-1-1:2008+A2:2010, 7.1.2;
- appliances equipped with an oven and/or with a grill having a fan either for the supply of combustion air or for the evacuation of the products of combustion;
- appliances equipped with a compartment in which a burner and an electric heating element can function simultaneously;
- appliances having one or more burners that are capable of remote operation (type 1 or type 2), unless the burner(s) concerned are thermostatically controlled oven burners of time-controlled ovens that are designed for a delayed start without the user being present.
This European Standard does not cover the requirements relating to third family gas cylinders, their regulators and their connection.
This European Standard only covers type testing.

The scope of EN 203-1:2021 applies, with the following addition and modification of the 3rd paragraph:
This document applies to catering, bakery and pizza ovens.
This document applies to gas heated natural and forced convection ovens, multi-function ovens and
atmospheric steaming ovens.
This document does not cover appliances which are specifically designed for use in industrial processes
on industrial premises nor appliances intended to be operated with the door open.

This document specifies the requirements and methods of test for the safety and marking of freestanding
and built-in domestic cooking appliances burning combustible gases given in EN 437:2021, referred to in
the text as “appliances”.
The appliances covered by this document are intended to be used in a domestic dwelling.
This document covers the following types of domestic cooking appliances:
— independent freestanding hobs;
— independent built-in hobs;
— hobs and grills;
— table cookers;
— freestanding ovens;
— built-in ovens;
— freestanding or built-in grills;
— griddles;
— freestanding cookers;
— built-in cookers.
This document also applies to gas cooking appliances incorporating electrical heating elements (e.g. gaselectric
cooking appliances).
For appliances intended to be used in caravans, or motorhomes/mobile homes or on board of ships or
aircraft, additional requirements may be necessary.
This document does not apply to:
a) outdoor appliances;
b) appliances connected to a combustion products evacuation duct;
c) appliances having a pyrolytic gas oven;
d) appliances incorporating flame supervision devices and having an automatic ignition device for
which the duration of the ignition attempt is limited by design;
e) appliances equipped with a burner that is periodically ignited and extinguished under the control of
an automatic on/off device;
f) appliances equipped with an oven and/or with a grill having a fan:
1) either for the supply of combustion air or for the evacuation of the products of combustion;
2) or for the circulation of the products of combustion within the compartments;
g) appliances incorporating one or more hob or grill burners that enable the user to program the
delayed start of the cooking cycle;
h) appliances of categories I2N, I2R, I3R, I2E(S), I2E(R), I2Esi, I2Er, I2R and the equivalent double and
triple categories which include these indices;
i) appliances of category II2E+3B.
This document does not cover the requirements relating to third family gas cylinders, their pressure
regulators and their connection.

The scope of EN 203-1:2021 applies, with the following modifications:
- replace the 2nd paragraph with the following:
This document applies to open burners, non-enclosed covered burners and wok burners appliances.
- replace the 3rd paragraph with the following :
This document does not cover appliances of type B.

EN 13611:2019, Clause 1 applies with the following modification:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing of pressure sensing devices for burners and appliances burning one or more gaseous fuels.
This document is applicable to pressure sensing devices for gaseous fuels, air, or combustion products with declared maximum inlet pressures up to and including 500 kPa.
It applies to all types of pressure sensing devices, including electronic, differential and inferential types.
It also specifies requirements for pressure sensing devices which are intended to be applied to steam boilers and as such need to meet increased reliability requirements.
EN 13611:2019 Clause 1, 4th paragraph is not applicable.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for manually operated taps and presetting taps for burners and appliances burning one or more gaseous fuels, hereafter referred to as "taps".
This document is applicable to taps with declared maximum inlet pressures up to and including 50 kPa and of nominal connection sizes up to and including DN 50 for use with one or more fuel gases.
Addition:
This document is not applicable to:
a)   manual operated shut-off valves conforming to EN 331:2015;
b)   controls which use auxiliary energy (e.g. electrical energy supplied externally).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

The scope of EN 203-1:2021 applies, with the following addition and modification of the 3rd paragraph.
This document applies to catering fryers.

This document specifies the requirements and test methods for the construction and operating
characteristics relating to safety and rational use of energy for gas heated commercial catering and
bakery appliances intended to be used indoor.
This document applies to all professional cooking and bakery appliances using gas for preparing food and
drink.
Only appliances of types A1, A2, A3, B1 and B2, as defined in Clause 4, are considered in this document.
Only the net calorific value (Hi) and net Wobbe index (Wi) are used.
The requirements concerning specific types of appliances are given in the relevant Part 2.
Annex C (informative) lists the main types of equipment covered by the scope of this document.
Appliances covered by this document are not intended to use gases containing carbon monoxide or other
toxic components.
NOTE For appliances intended to be used in vehicles, in trailers or on-board ships, additional requirements
can be necessary.

This standard specifies requirements and methods of test for lubricants to be used in gas appliances of all categories including auxilliary equipment mounted or intended to be mounted on such appliances and which may be in contact with combustible gases, except those designed for use in industrial processes.

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.

This document specifies requirements and associated test methods for rubber materials used in gas installations, gas equipment and gas appliances in contact with 1st, 2nd and 3rd family combustible gases as classified in EN 437:2018, additionally LPG, bio methane and bio LPG, in the same quality, are covered. It also establishes a classification based on temperature range and hardness. This document is applicable to materials from which homogeneous seals and homogeneous or reinforced diaphragms are manufactured.
Since the dimensions and shape of the components differ from those of standard test pieces taken from sheet material as used for type testing of the rubber materials according to this document, tolerances have been made in the requirements specified by Annex A for the components with respect to those specified for standard test pieces.
The range of operating temperatures covered by this document is –40 °C to +150 °C.
For applications with potential condensation, this document is not applicable for silicon rubber, e.g. above 200 hPa (200 mbar) nominal pressure or at temperatures below 0 °C with 3rd family gases.

This European Standard specifies the special constructional and operational characteristics, as well as the requirements and methods of test for safety and marking, for domestic cooking appliances having forced-convection ovens and /or grills using combustible gases, as defined in EN 30-1-1:2008+A2:2010.
Unless specifically excluded, this European Standard applies to appliances or their component parts, whether the component parts are independent or incorporated as part of the appliance, even if the other heating components use electrical energy (for example combined gas-electric cookers).
This European Standard includes requirements covering the electrical safety of equipment incorporated in the appliance that are associated with the use of gas. It does not include requirements covering the electric safety of electrically-heated components or their associated equipment1).
This European Standard does not apply to:
- outdoor appliances;
- appliances connected to a combustion products evacuation duct;
- appliances having a pyrolytic gas oven;
- appliances having covered burners which do not comply with the constructional requirements
of EN 30-1-1:2008+A2:2010, 5.2.8.2.2;
- appliances incorporating flame supervision devices and having an automatic ignition device for which the duration of the ignition attempt is limited by design;
- appliances equipped with a burner that is periodically ignited and extinguished under the control of an automatic on/off device;
- appliances equipped with a burner having a fan for the supply of combustion air or for the evacuation of the products of combustion;
- appliances supplied at pressures greater than those defined in EN 30-1-1:2008+A2:2010, 7.1.2;
- appliances equipped with an oven and/or with a grill having a fan either for the supply of combustion air or for the evacuation of the products of combustion;
- appliances equipped with a compartment in which a burner and an electric heating element can function simultaneously;
- appliances having one or more burners that are capable of remote operation (type 1 or type 2), unless the burner(s) concerned are thermostatically controlled oven burners of time-controlled ovens that are designed for a delayed start without the user being present.
This European Standard does not cover the requirements relating to third family gas cylinders, their regulators and their connection.
This European Standard only covers type testing.

This document specifies requirements and associated test methods for rubber materials used in gas installations, gas equipment and gas appliances in contact with 1st, 2nd and 3rd family combustible gases as classified in EN 437:2018, additionally LPG, bio methane and bio LPG, in the same quality, are covered. It also establishes a classification based on temperature range and hardness. This document is applicable to materials from which homogeneous seals and homogeneous or reinforced diaphragms are manufactured.
Since the dimensions and shape of the components differ from those of standard test pieces taken from sheet material as used for type testing of the rubber materials according to this document, tolerances have been made in the requirements specified by Annex A for the components with respect to those specified for standard test pieces.
The range of operating temperatures covered by this document is –40 °C to +150 °C.
For applications with potential condensation, this document is not applicable for silicon rubber, e.g. above 200 hPa (200 mbar) nominal pressure or at temperatures below 0 °C with 3rd family gases.

This document specifies requirements and test methods for unsintered polytetrafluorethylene (PTFE) tapes and polytetrafluorethylene (PTFE) strings (PTFE tapes or PTFE strings, for short) which are suitable for sealing threaded metallic joints as specified in EN 10226-1:2004.
This document covers two classes of PTFE tapes and PTFE strings suitable for fine (F) and coarse (G) threads.
The PTFE tapes and PTFE strings are used as sealing materials for metallic threaded joints in contact with 1st family gases (town gas), 2nd family gases (natural gas) and 3rd family gases (liquefied petroleum gases (LPG)) up to 500 kPa, up to 700 kPa for hot water of heating systems, and up to 20 kPa in gas appliances and their auxiliary equipment. The maximum working pressure covered in this document is 2000 kPa which is relevant to LPG storage. The temperature range is limited to −20 °C to 125 °C.

The scope of EN 203-1:2021 applies, with the following addition and modification of the 3rd paragraph.
This document applies to catering fryers.

This document specifies the requirements and test methods for the construction and operating
characteristics relating to safety and rational use of energy for gas heated commercial catering and
bakery appliances intended to be used indoor.
This document applies to all professional cooking and bakery appliances using gas for preparing food and
drink.
Only appliances of types A1, A2, A3, B1 and B2, as defined in Clause 4, are considered in this document.
Only the net calorific value (Hi) and net Wobbe index (Wi) are used.
The requirements concerning specific types of appliances are given in the relevant Part 2.
Annex C (informative) lists the main types of equipment covered by the scope of this document.
Appliances covered by this document are not intended to use gases containing carbon monoxide or other
toxic components.
NOTE For appliances intended to be used in vehicles, in trailers or on-board ships, additional requirements
can be necessary.

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.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for manually operated taps and presetting taps for burners and appliances burning one or more gaseous fuels, hereafter referred to as "taps".
This document is applicable to taps with declared maximum inlet pressures up to and including 50 kPa and of nominal connection sizes up to and including DN 50 for use with one or more fuel gases.
Addition:
This document is not applicable to:
a)   manual operated shut-off valves conforming to EN 331:2015;
b)   controls which use auxiliary energy (e.g. electrical energy supplied externally).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

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.

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
pressure regulators and pneumatic gas/air ratio pressure regulators (zero pressure regulators are
included as a special type of pneumatic gas/air ratio pressure regulators) for burners and appliances
burning one or more gaseous fuels, hereafter referred to as “pressure regulators”.
This document is applicable to pressure regulators with declared maximum inlet pressures up to and
including 50 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
— pressure regulators which use auxiliary energy;
— pneumatic gas/air ratio pressure regulators, which function by controlling a gas outlet pressure in
response to an air signal pressure, air signal differential pressure, and/or to a furnace pressure signal
(zero pressure regulators are included as a special type of pneumatic gas/air ratio pressure
regulators);
— pneumatic gas/air ratio pressure regulators, which change an air outlet pressure in response to a gas
signal pressure or a gas signal differential pressure.
This document is not applicable to:
— pressure regulators connected directly to a gas distribution network or to a container that maintains
a standard distribution pressure;
— pressure regulators intended for gas appliances to be installed in the open air and exposed to the
environment;
— mechanically linked gas/air ratio controls;
— electronic gas/air ratio controls (EN 12067-2:2022).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

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.

The scope of EN 203-1:2021 applies, with the following addition and modification of the 3rd paragraph:
This document applies to catering, bakery and pizza ovens.
This document applies to gas heated natural and forced convection ovens, multi-function ovens and
atmospheric steaming ovens.
This document does not cover appliances which are specifically designed for use in industrial processes
on industrial premises nor appliances intended to be operated with the door open.