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CEN

EN 15502-2-1:2012/FprA1

(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

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

When final draft in CCMC - Double check that a decision (to submit to FV) is taken both by CEN/TC 166 and CEN/TC 109 - See CEN/BT Decision 72/2014

Heizkessel für gasförmige Brennstoffe - Teil 2-1: Heizkessel der Bauart C und Heizkessel der Bauarten B2, B3 und B5 mit einer Nennwärmebelastung nicht größer als 1 000 kW

Chaudières de chauffage central utilisant les combustibles gazeux - Partie 2-1 : Norme spécifique pour les appareils de type C et les appareils de types B2, B3 et B5 dont le débit calorifique nominal est inférieur ou égal à 1 000 kW

Plinski kotli za centralno gretje - 2-1. del: Poseben standard za tip kotlov C in tipe kotlov B2, B3 in B5 z imensko močjo do vključno 1000 kW - Dopolnilo A1

General Information

Status
Not Published
ICS
27.060.30 - Boilers and heat exchangers
91.140.10 - Central heating systems
Technical Committee
CEN/TC 109 - Central heating boilers using gaseous fuels
Drafting Committee
CEN/TC 109/WG 1 - Domestic central heating boilers using gaseous fuels
Current Stage
5060 - Closure of Vote - Formal Approval
Start Date
17-May-2016
Due Date
10-Aug-2016
Completion Date
17-May-2016
Directive
2009/142/EC - DIRECTIVE 2009/142/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 30 November 2009 relating to appliances burning gaseous fuels
811/2013 - Commission Delegated Regulation (EU) No 811/2013 of 18 February 2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to the energy labelling of space heaters, combination heaters, packages of space heater, temperature control and solar device and packages of combination heater, temperature control and solar device
813/2013 - Commission Regulation (EU) No 813/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for space heaters and combination heaters
92/42/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
M/535 - [C(2016)2626) Standardisation request to the European standardisation organisations to draft harmonised European standards pursuant to Article 10(1) of Regulation (EU) No 1025/2012 of the European Parliament and of the Council in support of implementation of Commission Regulation (EU) No 813/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to eco-design requirements for space heaters and combination heaters and Commission Delegated Regulation (EU) No 811/2013 of 18 February 2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to the energy labelling of space heaters, combination heaters, packages of space heaters, temperature control and solar device and packages of combination heater, temperature control and solar device
M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
Ref Project
SIST EN 15502-2-1:2013/kFprA1:2016 - 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

Relations

Merged Into
EN 15502-2-1:2012+A1:2016 - 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
Effective Date
18-Jan-2023
Amends
EN 15502-2-1:2012 - 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
Effective Date
13-Nov-2013

Buy Standard

EN 15502-2-1:2013/oprA1:2014EN 15502-2-1:2013/oprA1:2014
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EN 15502-2-1:2013/oprA1:2014
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Standards Content (Sample)


SLOVENSKI STANDARD
SIST EN 15502-2-1:2013/oprA1:2014
01-marec-2014
3OLQVNLNRWOL]DFHQWUDOQRJUHWMHGHO3RVHEHQVWDQGDUG]DWLSNRWORY&LQWLSH
NRWORY%%LQ%]LPHQVNRPRþMRGRYNOMXþQRN:'RSROQLOR$
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
Heizkessel für gasförmige Brennstoffe - Teil 2-1: Heizkessel der Bauart C und
Heizkessel der Bauarten B2,B3 und B5 mit einer Nennwärmebelastung nicht größer als
1 000 kW
Chaudières de chauffage utilisant les combustibles gazeux - Partie 2-1: Norme
spécifique pour les appareils de type C et les appareils de types B2, B3 et B5 dont le
débit calorifique nominal est inférieur ou égal à 1 000 kW
Ta slovenski standard je istoveten z: EN 15502-2-1:2012/prA1
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.100.20 Plinski grelniki Gas heaters
SIST EN 15502-2-1:2013/oprA1:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 15502-2-1:2013/oprA1:2014

SIST EN 15502-2-1:2013/oprA1:2014

EUROPEAN STANDARD
DRAFT
EN 15502-2-1:2012
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
February 2014
ICS 91.140.10; 27.060.30
English Version
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
Combustibles de chauffage utilisant les combustibles Heizkessel für gasförmige Brennstoffe - Teil 2-1: Heizkessel
gazeux - Partie 2-1 : Norme spécifique pour les appareils der Bauart C und Heizkessel der Bauarten B2, B3 und B5
de type C et les appareils de types B2, B3 et B5 dont le mit einer Nennwärmebelastung nicht größer als 1 000 kW
débit calorifique nominal est inférieur ou égal à 1 000 kW
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 109.

This draft amendment A1, if approved, will modify the European Standard EN 15502-2-1:2012. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.

This draft amendment was established by CEN in three official versions (English, French, German). A version in any other language made
by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has
the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15502-2-1:2012/prA1:2014 E
worldwide for CEN national Members.

SIST EN 15502-2-1:2013/oprA1:2014
EN 15502-2-1:2012/prA1:2014 (E)
Contents
Page
Foreword .4
1 Modifications to the Foreword .4
2 Modifications to the Introduction .5
3 Modifications to '1 Scope' .5
4 Modifications to '3 Terms, definitions and symbols' .6
5 Modifications to '5 Construction' .8
6 Modifications to '8 Operational requirements'.9
6.1 Modifications to '8.1 General' .9
6.1.1 Modifications to '8.1.2.1 Installation of the boilers' .9
6.1.2 Modifications to Additions to '8.1.2 General test conditions' After clause 8.1.2.8 of EN
15502-2-1:2012, .9
6.2 Modifications to '8.2 Soundness' . 11
6.3 Modifications to '8.4 Heat inputs and heat output' . 11
6.4 Modifications to '8.6 Ignition, cross lighting, flame stability'. 12
6.4.1 Modifications to '8.6.2 Limit conditions" . 12
6.4.2 Modifications to '8.6.3 Special conditions " . 12
6.5 Modifications to '8.9 Pre-purge . 14
6.5.1 Modifications to '8.9.101 General' . 14
6.6 Modifications to 8.11.101 Air proving device . 15
6.6.1 Modifications to 8.11.101.3.3 Adjustment of the gas/air ratio . 15
6.7 Modifications to '8.12 Carbon monoxide' . 15
6.7.1 Modifications to '8.12.2.102 Boilers using Gas/air Ratio Controls" . 15
6.7.2 Modifications to '8.12.3 Special conditions'. 16
6.8 Addition of a new clause '8.104 Additional requirements for non-return valve for type C
(10)
and C boilers' . 17
(11)
"8.104 Additional requirements for non –return valve for type C and C boilers . 17
(10) (11)
8.104.1 General . 17
8.104.2 Nominal working temperature at the position of the non-return valve . 17
8.104.3 Leak tightness of the non-return valve. 17
8.104.4 Functional durability of the non-return valve . 18
8.104.5 Short term safety of boiler in case of a failing non-return valve . 18
8.104.6 Long term safety of the boiler in case of a failing non-return valve . 20
6.9 Addition of a new clause '8.105 Additional requirements for the evaluation of the
transport capacity of the commonshared duct system for type C(11) boilers ' . 20
"8.105 Additional requirements for the evaluation of the transport capacity of the common duct
system for type C boilers . 20
(11)
8.105.1 Requirements of common duct system without wind conditions . 20
8.105.2 Additional requirements of common duct system due to wind influence . 20
6.10 Modifications to '12.2.1.4 For installation of the combustion circuit' . 21
6.10.1 Addition of a new clause '12.2.1.4.111 For room sealed appliances of the type C boiler' . 21
(10)
6.10.2 Addition of a new clause '12.2.1.4.112 For room sealed appliances of the type C boiler' . 23
(11)
7 Modifications to '103 . Annexes' 24
8 Addition of a new 'Annex EE (informative) Example on calculation of common duct
system for type C appliances . 24
(11)
"Annex EE (informative) Example on calculation of common duct system for type C appliances . 25
(11)
9 Note to Annexes Z . 27
SIST EN 15502-2-1:2013/oprA1:2014
EN 15502-2-1:2012/prA1:2014 (E)

10 Modifications to Bibliography . 27

SIST EN 15502-2-1:2013/oprA1:2014
EN 15502-2-1:2012/prA1:2014 (E)
Foreword
This document (EN 15502-2-1:2012/prA1:2014) has been prepared by Technical Committee CEN/TC 109
“Central heating boilers using gaseous fuels”, the secretariat of which is held by NEN.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive.
1 Modifications to the Foreword

The flowing text is added in the foreword of EN 15502-2-1:2012 after the changes mentioned in EN 15502-2-
1:
1)
The requirements for type C and C boilers are now added to this draft standard.
(10) (11)
Explanatory Text:
Normally type C4 and type C8 boilers connected to common duct systems are functioning designed to
function with natural draught in the common flue duct system. If a common duct system, is applied at positive
pressure , new examination aspects are requested. For example: Boilers which are suitable for application in
such a duct system shall contain devices (valves) which prevents back flow of the combustion products of the
other boilers.
The boiler shall maintain its functionality and general safety level at positive and negative pressure.

If a system is a complete combined system including boilers, valves and the applied common duct system,
this system is examined according to the Gas Appliance Directive.

In the case C the appliances are evaluated on its own. The applied common duct system is designed by
(10)
another party, for example an installer, who takes the responsibility of the functioning of the complete system.
Starting points during the development of these requirements are:
— The approved technical content of the AHG-CO was drafted in a version of prEN 155502-2-1 dating from
October 2009. In this draft this technical content is added in the publication of EN 15502-2-1:2012.
— The definitions used for, C and type C boilers are the definition as drawn up by
(10) (11)
SFG-U/WG 1 for the use in the next version of CEN/TR 1749 (part of the these definitions are still draft
definitions).
— A non-return valve must prevent the back flow of combustion gas through boilers which are not running.
The non-return valve must be tested (Clause 5.102 and 8.104).
— When a tested open/close valve is used the boiler must be tested for resistance to condensate (safe
operation on short and long term). (Clause 8.104).
SIST EN 15502-2-1:2013/oprA1:2014
EN 15502-2-1:2012/prA1:2014 (E)

— One of the most critical situations is the influence of the positive pressure on the good working of the gas-
air-ratio control/gasvalve at minimum heat input. In this case the gas-air-ratio control/gasvalve can be out
of its working range. As a result of this a significant amount of CO can be produced. This item is dealt with
in Clause 8.12.2.102 and 8.12.3.101.8 and 8.12.101.9."

2 Modifications to the Introduction
The last 2 paragraphs of the introduction of EN 15502-2-1:2012:
"After the DOW (3 years after publication of both EN 15502-1 and EN 15502-2-1 in the OJEU) the standards
specified in Annex AA, for the appliance types covered in EN 15502-2-1, are withdrawn.
Annex AA lists those existing appliance types for which CEN/TC109 standards are intended to be replaced by
EN 15502-2-2. The standards listed in Annex AA are to be used until EN 15502-2-2 specifies that the
standards are withdrawn for the appliance types indicated. "
Are replaced by the following text:
After the DOW (3 years after the DAV of both EN 15502-1 and EN 15502-2-1) the standards specified in
Annex AA, for the appliance types covered in EN 15502-2-1, are withdrawn.
Annex AA also lists those existing appliance types for which CEN/TC109 standards are intended to be
replaced by EN 15502-2-2. The standards (that are intended to be replaced by EN 15502-2-2) listed in Annex
AA are to be used until EN 15502-2-2 specifies that the standards are withdrawn for the appliance types
indicated.
3 Modifications to '1 Scope'
rd
The following text is added after the 3 paragraph of the scope of EN 15502-2-1:2012:

"In this draft new text is added for the new types C and C , is included. In all 2 cases the definitions for
(10) (11)
these types are still draft definitions in the draft TR 1749 (date: Feburary 2013)."

The text under p) of the scope of EN 15502-
...

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al)   boilers intended to be installed in areas accessible to elderly people and children;
am)   boilers equipped with an adaptive combustion control function (ACCF).
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Add after k):
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SIST EN 15502-2-1:2022+A1:2024

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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.
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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;
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1)   without a gas-air ratio control, or
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ah)   C(11) boilers that have boiler modules:
1)   without a gas-air ratio control, or
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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);
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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”.
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NOTE For further background information on appliance types see CEN/TR 1749:2014 [1].
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b) where the temperature of the water is below or above 105 °C during normal operation;
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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";
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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.

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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:
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-   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 15502-1:2012/FprA1(Amendment)
Gas-fired heating boilers - Part 1: General requirements and tests
SIST EN 15502-1:2012/kFprA1:2015

Amendment for the addition of ecodesign requirements (Regulation No 813/2013)
and energy labelling requirements (Regulation No 811/2013)
This European Standard specifies the common requirements and test methods concerning, in particular the construction, safety, fitness for purpose, and rational use of energy, 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, according to CEN/TR 1749:2014:
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 heat transfer fluid does not exceed 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 installation instructions 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”
f)   which are intended to be installed inside a building or in a partially protected place;
g)   which are intended to produce hot water either by the instantaneous or storage principle, the whole being marketed as a single unit.
This European Standard applies to boilers designed for sealed water systems or for open water systems.
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.

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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.

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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).

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

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