EN 613:2021/prA1

Independent closed-fronted gas-fired type B11, type C11, type C31 and type C91 heaters

This document specifies the requirements and test methods for the construction, safety, marking and rational use of energy.
This document is applicable to types B11AS, B11BS, B11CS, C11, C31 and C91 appliances (see 4.2) and those that:
—   are closed-fronted;
—   incorporate a natural draught burner;
—   are connected directly to an open flue or to a device to evacuate the products of combustion (open-flued appliances, balanced-flued appliances);
—   are wall mounted, free-standing or built-in;
—   have a nominal heat input not exceeding 20 kW (based on the net calorific value).
This document is not applicable to:
—   open fronted appliances as specified in EN 13278:2013;
—   decorative fuel effect appliances as specified in EN 509:1999/A1:2003;
—   catalytic combustion appliances;
—   appliances in which the supply of combustion air and/or evacuation of products of combustion is achieved by mechanical means as specified in EN 1266:2002;
—   ducted-air appliances;
—    appliances installed by means of a closure plate (see 3.3.3.3).
Matters related to quality assurance systems, tests during production and to certificates of conformity of auxiliary devices are not dealt with by this standard.

Raumheizer mit geschlossener Vorderseite für gasförmige Brennstoffe der Geräte Art B11, Art C11, Art C31 und Art C91

Ersetze „EN 509:1999/A1:2003“ im 3. Absatz, 2. Aufzählungspunkt mit „EN 509:1999“
Lösche den letzten Absatz.

Appareils de chauffage indépendants à foyer fermé utilisant les combustibles gazeux de types B11, C11, C31 et C91

Dans le 3ème alinéa, tiret 2, remplacer « EN 509:1999/A1:2003 » par « EN 509:1999 ».
Supprimer le dernier alinéa.

Plinski grelniki z zaprtim kuriščem tipov B11, C11, C31 in C91 - Dopolnilo A1

General Information

• Status: Not Published
• Publication Date: 08-Nov-2026
• ICS: 97.100.20 - Gas heaters
• Technical Committee: CEN/TC 62 - Independent gas-fired space heaters
• Drafting Committee: CEN/TC 62/WG 3 - Chairman's Advisory Group
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 06-Nov-2025
• Due Date: 15-Sep-2025
• Completion Date: 06-Nov-2025
• Directive: 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
• Mandate: M/369 - Amendment to: Mandate to CEN/CENELEC concerning the execution of standardisation work for harmonized standards on Space heating appliance and energy capturing appliances
• Mandate: M/595 - [C(2023)4789] - Commission Implementing Decision of 20.7.2023 on a standardisation reques as regards gas appliances and fittings in support of Regulation (EU) 2016/426 of the European Parliament and of the Council
• Ref Project: SIST EN 613:2022/oprA1:2025 - Independent closed-fronted gas-fired type B11, type C11, type C31 and type C91 heaters

Relations

• Amends: EN 613:2021 - Independent closed-fronted gas-fired type B11, type C11, type C31 and type C91 heaters
• Effective Date: 31-Jul-2024

Overview

EN 613:2021/prA1 is a European standard published by CEN that specifies the essential requirements and test methods for independent closed-fronted gas-fired heaters of types B11, C11, C31, and C91. These heaters incorporate natural draught burners and are designed for connection to open flues or devices that evacuate combustion products, operating with a nominal heat input not exceeding 20 kW. This standard ensures safety, construction quality, energy efficiency, and proper marking for such gas-fired appliances.

The standard covers appliances that are wall-mounted, free-standing, or built-in and applies specifically to closed-fronted models of the types B11AS, B11BS, B11CS, C11, C31, and C91. It excludes open-fronted appliances, decorative fuel effect models, catalytic combustion heaters, appliances with mechanically assisted combustion air supply or exhaust, ducted-air appliances, and those installed using closure plates.

Key Topics

• Scope and Applicability
  EN 613:2021/prA1 focuses on closed-fronted gas heaters with natural draught burners connected to open or balanced flues. It applies to certain B11 and C-type appliances with nominal heat inputs up to 20 kW.

• Safety Requirements
  The standard requires the use of appropriate materials for gas-carrying components, proper accessibility for operation and maintenance, and specific flame supervision and safety devices like pressure regulators, thermostats, and overheat limiters.

• Construction and Materials
  Materials used must maintain functional integrity throughout a reasonable appliance lifespan, including resistance to heat and gas corrosion. Elastomeric materials must comply with standards for contact with gaseous fuels.

• Testing and Compliance
  EN 613 specifies test methods for operational performance, safety shutoffs, flame stability, and emissions such as oxides of nitrogen (NOx). Appliances must pass tests under normal and blocked flue conditions.

• Marking and Documentation
  Appliances must have clear marking showing type and gas category, electrical supply information when applicable, and relevant safety instructions to ensure correct installation and use.

• Classification and Amendments
  The standard classifies appliances based on flue evacuation methods and pressure soundness classes. The 2025 amendment improves normative references, clarifies terminology, updates testing procedures, and aligns with recent EU legislation (Regulation 2016/426/EU).

Applications

EN 613:2021/prA1 is crucial for manufacturers, installers, and regulatory bodies involved with gas-fired heating appliances designed for residential and light commercial heating applications. Typical practical uses include:

• Residential Heating Solutions
  Installing independent gas heaters in homes that require safe, efficient, and environmentally compliant space heating without complex mechanical ventilation systems.

• Commercial and Institutional Buildings
  Use in small-scale commercial environments where closed-fronted gas heaters with natural draught burners are appropriate and cost-effective.

• Quality Assurance and Certification
  Assisting manufacturers in meeting harmonized European safety and energy performance requirements, enabling market access and consumer confidence.

• Regulatory Compliance
  Helping conformity assessment bodies and authorities ensure appliances meet EU directives and national standards focused on combustion safety and emissions control.

Related Standards

EN 613:2021/prA1 references and aligns with several complementary standards critical for gas-fired appliance design and testing:

• EN 509:1999 - Standards for decorative fuel effect gas appliances, which are excluded from EN 613 applicability.
• EN 88-1:2022+A1:2023 - Safety and control devices including pressure regulators.
• EN 125:2022+A1:2024 - Requirements for gas safety valves and flame supervision devices.
• EN 161:2022+A1:2025 - Thermostats and limiters for gas appliances.
• EN 298:2022 - Automatic burner control systems.
• EN IEC 60335-1:2023 - General safety requirements for household electrical appliances.
• EN IEC 60335-2-102:2024 - Specific requirements for gas, oil, and solid-fuel burning appliances with electrical connections.
• EN 60529:1991 - Degrees of protection provided by enclosures (IP codes).

For detailed compliance with EU Regulation 2016/426/EU on gas appliances, Annex ZA of EN 613 provides an informative correlation.

---

Keywords: EN 613:2021, gas-fired heaters, closed-fronted appliances, natural draught burner, type B11 heater, type C11 heater, type C31 heater, type C91 heater, gas appliance safety, European gas appliance standard, heater test methods, burner safety devices, gas heater efficiency, gas appliance marking, CEN standards, EU gas appliance regulation, space heating standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2025
Plinski grelniki z zaprtim kuriščem tipov B11, C11, C31 in C91 - Dopolnilo A1
Independent closed-fronted gas-fired type B11, type C11, type C31 and type C91
heaters
Raumheizer mit geschlossener Vorderseite für gasförmige Brennstoffe der Geräte Art
B11, Art C11, Art C31 und Art C91
Appareils de chauffage indépendants à foyer fermé utilisant les combustibles gazeux de
types B11, C11, C31 et C91
Ta slovenski standard je istoveten z: EN 613:2021/prA1
ICS:
97.100.20 Plinski grelniki Gas heaters
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 613:2021
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
August 2025
ICS 97.100.20
English Version
Independent closed-fronted gas-fired type B11, type C11,
type C31 and type C91 heaters
Appareils de chauffage indépendants à foyer fermé Raumheizer mit geschlossener Vorderseite für
utilisant les combustibles gazeux de types B11, C11, gasförmige Brennstoffe der Geräte Art B11, Art C11,
C31 et C91 Art C31 und Art C91
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 62.

This draft amendment A1, if approved, will modify the European Standard EN 613:2021. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

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

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 613:2021/prA1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Modification to the European foreword . 5
2 Modification to Clause 1, Scope . 5
3 Modification to Clause 2, Normative references . 5
4 Deletion of term 3.1.2, forced gas-fired heater . 6
5 Modification to 4.2, Classification according to the method of evacuation of the products of
combustion . 6
6 Modification to 5.1.2, Materials and method of construction . 6
7 Modification to 5.1.3, Accessibility for use and maintenance. 7
8 Modification to 5.1.6.3, Built-in appliances . 7
9 Modification to 5.1.8, Electrical equipment . 7
10 Modification to 5.1.9.1, Interruption and restoration . 7
11 Modification to 5.1.10, Confirmation of operation . 7
12 Modification to 5.2.4.1, General . 7
13 Modification to 5.2.4.2, Manual valve system . 8
14 Modification to 5.2.4.3, Automatic valve systems . 8
15 Modification to 5.2.5, Flame supervision devices . 8
16 Modification to 5.2.6, Pressure regulators . 8
17 Modification to 5.2.7, Thermostats and Overheat Limit devices . 8
18 Modification to 5.4.1, Appliances with automatic burner systems . 8
19 Modification to Clause 5.6 . 8
20 Modification to 6.1.2.1, Type B appliances . 8
21 Modification to 6.1.2.3, Supplementary tests . 9
22 Modification to 6.3.2, Temperature of components . 9
23 Modification to 6.4.1.2, Supplementary tests . 9
24 Modification to 6.6.2, Measurement of oxides of nitrogen, NO , (all appliances) . 9
x
25 Modification to 6.8.2.2, Blocked flue conditions . 9

26 Modification to 6.10, Efficiency . 9
27 Modification to 7.1.4, Test pressures . 10
28 Modification to 7.1.5.3, Test installation . 10
29 Modification to 7.2.2.2, Type C , C and C appliances. 10
11 31 91
30 Modification to 7.4.4.1, General . 11
31 Modification to 7.4.4.2, Built-in appliances . 11
32 Modification to 7.4.4.3, All other appliances . 11
33 Modification to 7.5.1.1, All appliances . 11
34 Modification to 7.5.1.2, Supplementary tests . 11
35 Modification to 7.5.2, Flame stability . 11
36 Modification to 7.5.3, Effects of room draughts (for type B appliances) . 12
37 Modification to 7.5.4.2, Type C and Type C appliances . 12
31 91
38 Modification to 7.7.1.1, Introduction . 12
39 Modification to 7.7.2.2, Incomplete combustion gas . 12
40 Modification to 7.7.4, Measurement of oxides of nitrogen (all appliances) . 12
41 Modification to 7.9.3.2, Nuisance shutdown . 12
42 Modification to 7.10.2.2, Safety time . 13
43 Modification to 7.11.1.3, Type C , C and C appliances . 13
11 31 91
44 Modification to 7.11.2, Determination of efficiency . 13
45 Modification to 8.1.1, Marking of the appliance . 13
46 Modification to 8.1.2, Other marking . 14
47 Modification to 8.1.3.2, Additional . 14
48 Modification to 8.1.4.1, Electrical supply . 14
49 Modification to 8.1.4.2, Type of gas . 14
50 Modification to 8.2.1.1, All appliances . 14
51 Modification to 8.2.2, Instructions for use and servicing . 15
52 Modification to text of Figure 3, Disposition of test apparatus for type C appliances . 15
53 Modification to Annex G . 15
54 Addition of Annex ZA (informative) . 16
Table ZA.1 — Correspondence between this European Standard and EU-Regulation 2016/426/EU
............................................................................................................................................................................. 16
55 Modification to the Bibliography . 18
European foreword
This document (EN 613:2021/prA1:2025) has been prepared by Technical Committee CEN/TC 62
“Independent gas-fired space heaters”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequentially approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
1 Modification to the European foreword
Under the “The main changes compared to EN 613:2000 are the following:” replace “Annex G” with “Annex
F”.
2 Modification to Clause 1, Scope
Replace “EN 509:1999/A1:2003” in paragraph 3, bullet 2 with “EN 509:1999”.

Delete the final paragraph.
3 Modification to Clause 2, Normative references
Delete the following references:
EN 60730-1:2016 and CR 1404:1992.
Replace the following:
“EN 88-1:2011+A1:2016, Pressure governors for gas appliances for inlet pressure up to 200 mbar” with “EN
88-1:2022+A1:2023, Safety and control devices for gas burners and gas burning appliances – Part 1:
Pressure regulators for inlet pressure up to and including 50 kPa”;
“EN 125:2010+A1:2015” with “EN 125:2022+A1:2024”;
“EN 161:2011+A3:2013” with “EN 161:2022+A1:2025”;
“EN 257:2010” with “EN 257:2022+A1:2023”;
“EN 298:2012” with “EN 298:2022”;
“EN 60335-1:2012/A2:2019” with “EN IEC 60335-1:2023, Household and similar electrical appliances —
Safety — Part 1: General requirements (IEC 60335-1:2020)” and add the following corresponding footnote
to text “As impacted by EN IEC 60335-1:2023/A11:2023.”;
“EN 60335-2-102:2016” with “EN IEC 60335-2-102:2024, Household and similar electrical appliances —
Safety — Part 2-102: Particular requirements for gas, oil and solid-fuel burning appliances having electrical
connections (IEC 60335-2-102:2017)” and add the following corresponding footnote to text “As impacted
by EN IEC 60335-2-102:2024/A11:2024.”;
“EN 60529:1991/A2:2013” with “EN 60529:1991” and add a footnote “As impacted by
EN 60529:1991/A1:2000, EN 60529:1991/A2:2013, EN 60529:1991/AC:2016-12 and
EN 60529:1991/A2:2013/AC:2019-02”;
“EN IEC 60730-2-9:2019/A1:2019” with “EN IEC 60730-2-9:2019, Automatic electrical controls — Part
2-9: Particular requirements for temperature sensing controls (IEC 60730-2-9:2015)” and add the following
corresponding footnote to text “As impacted by EN IEC 60730-2-9:2019/A1:2019 and EN IEC 60730-2-
9:2019/A2:2020.”;
ISO 7-1:1994, add a footnote to text “As impacted by ISO 7-1:1994/Cor 1:2007.”.

4 Deletion of term 3.1.2, forced gas-fired heater
Delete term and definition 3.1.2 and adapt the following numbering (will not be tagged).

5 Modification to 4.2, Classification according to the method of evacuation of the
products of combustion
Add the following below “Type C : A natural draught type C appliance.”: “
11 1
• Type C : Soundness pressure class 10 Pa
11;10
• Type C : Soundness pressure class 50 Pa”;
11;50
Add the following below “Type C : A natural draught type C appliance.”: “
31 3
: Soundness pressure class 10 Pa
• Type C31;10
• Type C : Soundness pressure class 50 Pa”;
31;50
Add the following below “Type C : A natural draught type C appliance.”: “
91 9
• Type C : Soundness pressure class 10 Pa
91;10
• Type C : Soundness pressure class 50 Pa”.
91;50
Add the following NOTE to the end of the subclause:
“NOTE Classification of gas appliances according to the method of test of supplying combustion air and
the evacuation of the combustion products is described in EN 1749:2020.”.

6 Modification to 5.1.2, Materials and method of construction
Replace paragraph 1 with the following:
“The quality and thickness of the materials used in the construction of the appliance, and the method of
assembling the various parts, shall be such that the constructional, functional and operational
characteristics do not alter during a reasonable life under normal conditions of installation, use and
maintenance. This includes the gas carrying components which shall be of metallic material but suitable
for the type of gas relevant for the appliance for which the appliance is intended, this includes the gas
carrying and flue carrying components.”.

Add the following text as a new paragraph 2:
“Any elastomeric material used in the gas carrying components in contact with gaseous fuels shall be
st nd rd
appropriate for the intended use in the appliance. Elastomeric materials in contact with 1 , 2 , or 3
family gases of temperature E1 and hardness class H2 as defined in EN 549:2019+A2:2024 are suitable
for all appliances.”.
Delete the following text from the former paragraph 2 (now paragraph 3):
“and national installation requirements”.

7 Modification to 5.1.3, Accessibility for use and maintenance
Delete the text “by the manufacturer” in the last paragraph.

8 Modification to 5.1.6.3, Built-in appliances
Replace the last sentence in paragraph 1 with the following text:
“If a special tool is required it shall be supplied.”.

9 Modification to 5.1.8, Electrical equipment
Replace the reference in paragraph 2 “EN 298:2012” with “EN 298:2022”.
Replace the reference in paragraph 1 “EN 60335-2-102:2016” with “EN IEC 60335-2-102:2024”.
Replace the reference in the last paragraph “EN 60529:1991/A2:2013” with “EN 60529:1991”.

10 Modification to 5.1.9.1, Interruption and restoration
Replace the reference to “6.4.2.3” with “6.4.3”.

11 Modification to 5.1.10, Confirmation of operation
Replace the text of paragraph 3 with the following text:
“Where the user is unable to see the main burner, there shall be an indirect means of signalling (e.g.
control lamp). In this case, it shall not be possible for the signal of the existence of the flame to be confused
with a signal for any malfunction, apart from that of a malfunction of the flame control itself, which shall
be expressed by the indication of an absence of flame.”.

12 Modification to 5.2.4.1, General
Replace the text of paragraph 1 wit
...