Heating boilers - Part 5: Heating boilers for solid fuels, manually and automatically stoked, nominal heat output of up to 500 kW - Terminology, requirements, testing and marking

1.1 General
This European Standard applies to heating boilers including safety devices up to a nominal heat output of 500 kW which are designed for the burning of solid fuels only and are operated according to the instructions of the boiler manufacturer.
This European Standard deals with significant hazards, hazardous situations and events relevant to heating boilers used as intended and under the conditions foreseen by the manufacturer (see Clause 4).
The boilers may operate under natural draught or forced draught. The stoking may work manually or automatically.
The boilers may operate under room sealed conditions in case of supervised under pressure in the combustion chamber.
The boilers may operate in condensing condition.
NOTE This European Standard deals with boilers which are both within and outside of the scope of the Machinery
Directive 2006/42/EC.
This European Standard contains requirements and test methods for safety, combustion quality, operating characteristics, marking and maintenance of heating boilers and secondary emission reduction appliances and efficiency improvement appliances. It also covers all external equipment that influences the safety systems (e.g. back burning safety device, integral fuel hopper).
This European Standard covers only boilers that include burners as a unit. The standard applies to the combination of a boiler body with a solid fuel burner according to EN 15270 as a unit only when the whole unit is tested in accordance with this European Standard.
Heating boilers in accordance with this European Standard are designed for central heating installations where the heat carrier is water and the maximum allowable temperature is 110 °C, and which can operate at a maximum allowable operating pressure of 6 bars. For heating boilers with a built-in or attached water heater (storage or continuous flow heater), this European Standard only applies to those parts of the water heater which are necessarily subject to the operating conditions of the heating boiler (heating part).
This European Standard does not apply to:
heating boilers and other heating appliances which are also designed for the direct heating of the place of installation;
cooking appliances;
the design and construction of external fuel storage and transportation devices prior to the safety devices of the boiler;
room sealed applications above a nominal heat output > 70 kW or operated with positive pressure in the combustion chamber or operated under natural draught;
This European Standard specifies the necessary terminology for solid fuel heating boilers, the control and safety related requirements, the design requirements, the technical heating requirements (taking into account the environmental requirements) and testing, as well as the marking requirements.
This European Standard is not applicable to heating boilers which are tested before the date of its publication as an EN (European Standard).
1.2 Fuels
These boilers may burn either fossil fuels, biogenic fuels or other fuels such as peat, as specified for their use by the boiler manufacturer, in accordance with the requirements of this European Standard.
Solid fuels included in this European Standard are categorised as follows.
1.2.1 Biogenic fuels
Biomass in a natural state, in the form of:
Adaptation to new fuels standards and consideration of new fuels standards in preparation.
A log wood with moisture content w ≤ 25 %, according to EN 14961-5;
B1 chipped wood (wood chipped by machine, usually up to a maximum length of 15 cm) with moisture content from w 15 % to w 35 %, according to EN 14961-4;
B2 chipped wood as under B1, except with moisture content w > 35 %;
C1 compressed wood (e.g. pellets without additives, made of wood and/or bark particles; natural binding agents such as molasses, vegetable paraffins and starch are permitted), pellets according to EN 14961-2;
(...)

Heizkessel - Teil 5: Heizkessel für feste Brennstoffe, manuell und automatisch beschickte Feuerungen, Nennwärmeleistung bis 500 kW - Begriffe, Anforderungen, Prüfungen und Kennzeichnung

1.1 Allgemeines
Dieses Dokument ist anzuwenden für Heizkessel und deren Sicherheitseinrichtungen bis zu einer Nennwärmeleistung von 500 kW, die ausschließlich für die Verfeuerung von festen Brennstoffen vorgesehen sind und nach den mitgelieferten Anweisungen des Kesselherstellers sowie dem unter normalen Umständen vorhersehbaren Fehlanwendung betrieben werden.
Dieses Dokument ist darüber hinaus anzuwenden für mit festen Brennstoffen betriebene Kessel, die mit Verbrennungsluft von der Außenseite des Gebäudes gespeist werden, sowie für raumluftunabhängige Feuerstätten.
Dieses Dokument behandelt signifikante Gefahren, gefährliche Situationen und Ereignisse, die für Heizkessel im bestimmungsmäßigen Betrieb und unter den in der technischen Dokumentation des Kessels festgelegten Bedingungen relevant sind (siehe Abschnitt 4).
Die Heizkessel können mit Naturzug oder mit Gebläse betrieben werden. Die Brennstoffzufuhr kann von Hand oder automatisch erfolgen. Der Kessel kann nicht-kondensierend oder kondensierend betrieben werden.
ANMERKUNG 1 Dieses Dokument behandelt Kessel, die im Anwendungsbereich der Maschinenrichtlinie 2006/42/EG oder nicht im Anwendungsbereich der Maschinenrichtlinie 2006/42/EG liegen (manuell beschickter Kessel ohne Gebläse).
ANMERKUNG 2 Es besteht das Risiko, dass Kondensat bei niedrigen Temperaturen im Kondensatablass gefriert.
Dieses Dokument enthält Anforderungen und Prüfverfahren für die Sicherheit, die Verbrennungsleistung, das Betriebsverhalten, die Kennzeichnung und die Wartung von Heizkesseln. Darüber hinaus behandelt die Norm die gesamte externe Ausrüstung, die Einfluss auf die Sicherheitssysteme hat (z. B. Rückbrand-Schutzeinrichtung, integrierter Brennstoffvorratsbehälter).
Dieses Dokument betrachtet nur Heizkessel mit Brennern im Verbund als Gesamteinheit. Das Dokument ist nur auf eine Kombination aus Kesselkörper und einem Brenner entsprechend EN 15270:2007 anwendbar, wenn die Gesamteinheit nach dem vorliegenden Dokument geprüft wird.
Heizkessel nach diesem Dokument sind für die Beheizung von zentralen Heizungsanlagen bestimmt, deren Wärmeträger Wasser mit einer maximal zulässigen Temperatur von 110 °C ist und die mit einem maximal zulässigen Betriebsdruck von 6 bar betrieben werden können. Bei Heizkesseln mit eingebautem oder einem angebautem Wassererwärmer (Speicher- oder Durchlaufwassererwärmer) ist dieses Dokument nur für die Bauteile des Wassererwärmers anzuwenden, die zwangsläufig den Betriebsbedingungen des Heizkessels unterliegen (Heizungsteil).
Dieses Dokument ist nicht anzuwenden für:
- Heizkessel und andere Heizgeräte, die auch zur direkten Beheizung des Aufstellraums konstruiert sind, auch nach der Europäischen Verordnung 2015/1185/EU;
- Kochgeräte;
- Auslegung und Konstruktion von externen Brennstofflagern und Beschickungs¬einrichtungen vor den Sicherheitseinrichtungen des Heizkessels;
- manuell beschickte Strohballen-Heizkessel;
- KWK Geräte (Kraft-Wärme-Kopplung).
Dieses Dokument legt die für Heizkessel für feste Brennstoffe notwendigen Begriffe, die regelungs- und sicherheitstechnischen Anforderungen, die Bauanforderungen, die heiztechnischen Anforderungen (unter Berücksichtigung der Umweltanforderungen) und deren Prüfungen sowie die Kennzeichnung fest.
[...]

Chaudières de chauffage - Partie 5 : Chaudières spéciales pour combustibles solides, à chargement manuel et automatique, puissance utile inférieure ou égale à 500 kW - Définitions, exigences, essais et marquage

1.1 Généralités
Le présent document s’applique aux chaudières de chauffage, y compris aux dispositifs de sécurité, ayant une puissance utile nominale inférieure ou égale à 500 kW, qui sont conçues pour la combustion de combustibles solides uniquement et qui sont mises en œuvre conformément aux instructions fournies avec la chaudière et au mauvais usage raisonnablement prévisible défini par le constructeur.
Le présent document s'applique également aux chaudières à combustibles solides prélevant l'air de combustion à l'extérieur du bâtiment et aux appareils à circuit étanche.
Le présent document traite des phénomènes dangereux, situations dangereuses et événements dangereux significatifs se rapportant aux chaudières de chauffage utilisées comme il se doit et selon les conditions définies dans la documentation technique de la chaudière (voir Article 4).
Les chaudières peuvent être à tirage naturel ou forcé. L'alimentation de combustible peut être manuelle ou automatique. Les chaudières peuvent fonctionner en ou sans condensation.
NOTE 1 Le présent document traite des chaudières qui sont couvertes par le domaine d'application de la Directive Machines 2006/42/CE et les chaudières qui ne sont pas couvertes par le domaine d'application de la Directive Machines 2006/42/CE (chaudière à tirage naturel à chargement manuel).
NOTE 2 Il existe un risque de gel des condensats lors de l'évacuation des condensats à basse température.
Le présent document contient des exigences et méthodes d'essai relatives à la sécurité, à la combustion, à la performance, aux caractéristiques de fonctionnement, au marquage et à la maintenance des chaudières de chauffage. Elle couvre également tout équipement externe qui influence les systèmes de sécurité (par exemple dispositif de sécurité contre un retour de flamme, trémie à combustible intégrée).
Le présent document ne couvre que les chaudières intégrant des brûleurs comme une unité thermique. Le document s'applique à l'association d'un corps de chaudière avec un brûleur de combustibles solides conformément à l'EN 15270:2007 sous forme d'une unité thermique uniquement lorsque cette association est soumise à essai conformément au présent document.
Les chaudières conformes au présent document sont conçues pour des installations de chauffage central dont le fluide caloporteur est l'eau, avec une température maximale admissible de 110 °C (limiteur de température de sécurité) et une pression hydraulique maximale de service admissible de 6 bars. Pour des chaudières à production d'eau chaude par ballon ou échangeurs noyés ou juxtaposés (par accumulation ou à production instantanée), le présent document ne s'applique qu'aux éléments du système de production d'eau chaude qui sont soumis aux conditions de fonctionnement de la partie chauffage de la chaudière.
[...]

Kotli za gretje - 5. del: Kotli na trdna goriva z ročnim in avtomatskim polnjenjem z nazivno močjo do 500 kW - Terminologija, zahteve, preskušanje in označevanje (vključuje dopolnilo A1)

General Information

Status
Published
Publication Date
09-Jan-2023
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
17-Nov-2022
Due Date
22-Jan-2023
Completion Date
10-Jan-2023

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SLOVENSKI STANDARD
SIST EN 303-5:2021+A1:2023
01-februar-2023
Nadomešča:
SIST EN 303-5:2021

Kotli za gretje - 5. del: Kotli na trdna goriva z ročnim in avtomatskim polnjenjem z

nazivno močjo do 500 kW - Terminologija, zahteve, preskušanje in označevanje
(vključuje dopolnilo A1)

Heating boilers - Part 5: Heating boilers for solid fuels, manually and automatically

stoked, nominal heat output of up to 500 kW - Terminology, requirements, testing and

marking
Heizkessel - Teil 5: Heizkessel für feste Brennstoffe, manuell und automatisch
beschickte Feuerungen, Nennwärmeleistung bis 500 kW - Begriffe, Anforderungen,
Prüfungen und Kennzeichnung

Chaudières de chauffage - Partie 5 : Chaudières spéciales pour combustibles solides, à

chargement manuel et automatique, puissance utile inférieure ou égale à 500 kW -
Définitions, exigences, essais et marquage
Ta slovenski standard je istoveten z: EN 303-5:2021+A1:2022
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.100.30 Grelniki na trdo gorivo Solid fuel heaters
SIST EN 303-5:2021+A1:2023 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 303-5:2021+A1:2023
---------------------- Page: 2 ----------------------
SIST EN 303-5:2021+A1:2023
EN 303-5:2021+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 91.140.10 Supersedes EN 303-5:2021
English Version
Heating boilers - Part 5: Heating boilers for solid fuels,
manually and automatically stoked, nominal heat output of
up to 500 kW - Terminology, requirements, testing and
marking

Chaudières de chauffage - Partie 5 : Chaudières Heizkessel - Teil 5: Heizkessel für feste Brennstoffe,

spéciales pour combustibles solides, à chargement manuell und automatisch beschickte Feuerungen,

manuel et automatique, puissance utile inférieure ou Nennwärmeleistung bis 500 kW - Begriffe,

égale à 500 kW - Définitions, exigences, essais et Anforderungen, Prüfungen und Kennzeichnung

marquage

This European Standard was approved by CEN on 15 February 2021 and includes Amendment 1 approved by CEN on 14

September 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 303-5:2021+A1:2022 E

worldwide for CEN national Members.
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SIST EN 303-5:2021+A1:2023
EN 303-5:2021+A1:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 5

Introduction .................................................................................................................................................................... 7

1 Scope .................................................................................................................................................................... 8

1.1 General ................................................................................................................................................................ 8

1.2 Fuels ..................................................................................................................................................................... 9

2 Normative references ................................................................................................................................. 10

3 Terms and definitions ................................................................................................................................ 13

4 Requirements ................................................................................................................................................ 20

4.1 General requirements ................................................................................................................................ 20

4.1.1 General requirements for all boilers .................................................................................................... 20

4.1.2 General requirements for condensing boilers .................................................................................. 21

4.2 Construction requirements ...................................................................................................................... 22

4.2.1 Production documentation....................................................................................................................... 22

4.2.2 Heating boilers (parts) made of steel ................................................................................................... 23

4.2.3 Boilers made of cast materials ................................................................................................................ 29

4.2.4 Design requirements .................................................................................................................................. 30

4.2.5 Requirements for boilers with outside combustion air supply and room sealed

appliances ....................................................................................................................................................... 33

4.3 Safety requirements .................................................................................................................................... 34

4.3.1 General ............................................................................................................................................................. 34

4.3.2 Manual stoked boilers ................................................................................................................................ 35

4.3.3 Safety against back burning for automatic stoked boilers............................................................ 35

4.3.4 Prevention of the transmission of toxic components ..................................................................... 38

4.3.5 Safety against fuel overload of the boiler or interruption in fuel supply ................................ 39

4.3.6 Safety against lack of air supply or insufficient combustion ........................................................ 39

4.3.7 Surface temperatures ................................................................................................................................. 40

4.3.8 Leakage of the boilers category 1 ........................................................................................................... 40

4.3.9 Temperature control and limiting devices ......................................................................................... 40

4.3.10 Assessment of additional risk .................................................................................................................. 42

4.3.11 Additional safety requirements for condensing boilers ................................................................ 42

4.3.12 Additional safety requirements for outside air supply boilers and room sealed

appliances ....................................................................................................................................................... 43

4.3.13 Heating boiler accessories ........................................................................................................................ 43

4.4 Performance requirements ...................................................................................................................... 44

4.4.1 General ............................................................................................................................................................. 44

4.4.2 Energy efficiency .......................................................................................................................................... 44

4.4.3 Flue gas temperature .................................................................................................................................. 46

4.4.4 Draught ............................................................................................................................................................ 46

4.4.5 Combustion period ...................................................................................................................................... 46

4.4.6 Minimum heat output ................................................................................................................................. 47

4.4.7 Emission limits .............................................................................................................................................. 47

5 Test .................................................................................................................................................................... 49

5.1 Test conditions .............................................................................................................................................. 49

5.1.1 General ............................................................................................................................................................. 49

5.1.2 Choice of boiler and fittings to be tested ............................................................................................. 49

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SIST EN 303-5:2021+A1:2023
EN 303-5:2021+A1:2022 (E)

5.1.3 Condition of the boiler ................................................................................................................................ 50

5.1.4 Type test ........................................................................................................................................................... 50

5.2 Measuring instruments and methods ................................................................................................... 50

5.3 Test fuel ............................................................................................................................................................ 51

5.4 Pressure test for boilers of sheet or sheet metal of non-ferrous metal .................................... 53

5.4.1 Tests to be carried out before production ........................................................................................... 53

5.4.2 Test during production............................................................................................................................... 53

5.5 Pressure test for boilers of cast iron or non-ferrous metals ........................................................ 54

5.5.1 Test to be carried out before production ............................................................................................. 54

5.5.2 Test during production............................................................................................................................... 54

5.6 Conducting the boiler performance test .............................................................................................. 55

5.6.1 General ............................................................................................................................................................. 55

5.6.2 Setting up the test rig .................................................................................................................................. 55

5.6.3 Measured quantities .................................................................................................................................... 56

5.6.4 Test method and test duration ................................................................................................................ 57

5.7 Determination of the heat output and the efficiency of the boiler ............................................. 57

5.7.1 Method for the measurement of the heat output .............................................................................. 57

5.7.2 Determining the nominal heat output .................................................................................................. 58

5.7.3 Determining the minimum heat output ............................................................................................... 58

5.7.4 Verification of nominal heat output with condensation ................................................................ 59

5.7.5 Verification of the minimum continuous heat output with condensation ............................... 59

5.7.6 Determination of the boiler efficiency (direct method) ................................................................. 59

5.7.7 Electrical consumption ............................................................................................................................... 59

5.8 Determination of the emission values .................................................................................................. 60

5.8.1 Heating boiler with manual stoking ...................................................................................................... 60

5.8.2 Heating boiler with automatic stoking ................................................................................................. 60

5.9 Calculation ...................................................................................................................................................... 60

5.9.1 Boiler heat output ........................................................................................................................................ 60

5.9.2 The heat input ................................................................................................................................................ 60

5.9.3 Boiler efficiency ............................................................................................................................................ 60

5.9.4 Emissions ......................................................................................................................................................... 62

5.10 Determination of the waterside resistance......................................................................................... 63

5.11 Surface temperature.................................................................................................................................... 63

5.12 Verification of condensate ......................................................................................................................... 64

5.13 Function check of the temperature controller and safety temperature limiter at the

boiler ................................................................................................................................................................. 64

5.14 Function test for the rapidly disconnectable firing system........................................................... 64

5.15 Function test on the device for dissipating excess heat (partly or non-disconnectable

firing system) ................................................................................................................................................. 65

5.16 Selected tests to demonstrate functional safety ................................................................................ 65

5.16.1 General ............................................................................................................................................................. 65

5.16.2 Safety test of consequences of fuel overload and effect of a blockage of the fuel

supply ................................................................................................................................................................ 66

5.16.3 Loss of combustion air supply.................................................................................................................. 66

5.16.4 Resistance to thermal conductance ....................................................................................................... 66

5.16.5 Additional tests for alternative verification of the safety against back burning ................... 67

5.16.6 Test for gas side leakage ............................................................................................................................ 67

5.17 Check of safety for condensing operation ............................................................................................ 68

5.18 Additional checks of the safety for boilers with outside combustion air supply .................. 68

5.18.1 Test of leakage rates .................................................................................................................................... 68

5.18.2 Temperature at combustion air connector ......................................................................................... 68

5.18.3 Functional safety and design limits caused by recirculation of flue gas into the

combustion air supply ................................................................................................................................ 68

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SIST EN 303-5:2021+A1:2023
EN 303-5:2021+A1:2022 (E)

6 Test report and other documents .......................................................................................................... 69

7 Marking ............................................................................................................................................................ 70

7.1 General ............................................................................................................................................................. 70

7.2 Information on the boiler plate .............................................................................................................. 70

7.3 Boiler plate requirements ........................................................................................................................ 70

8 Technical documentation, supplied with boiler ............................................................................... 70

8.1 General ............................................................................................................................................................. 70

8.2 Technical information and installation instructions ...................................................................... 71

8.3 Operating instructions ............................................................................................................................... 73

Annex A (informative) Manual measurement of particles in the gas flow, gravimetric

determination of particle load with filter systems .......................................................................... 74

Annex B (normative) Design criteria for solutions to prevent back burning ..................................... 77

Annex C (informative) Installation of boilers with combustion air supply from outside the

building ............................................................................................................................................................ 83

Annex D (informative) Recommended limits for substances of content of the condensate .......... 85

Annex E (informative) Recommended analytical methods ....................................................................... 86

Annex F (informative) Calculation methods .................................................................................................... 87

F.1 Calculation of seasonal space heating energy efficiency ............................................................... 87

F.2 Calculation of Energy Efficiency Index (EEI) ...................................................................................... 89

F.3 Seasonal space heating emissions.......................................................................................................... 89

Annex G (normative) Calculation methods for recirculation influence ................................................ 91

Annex H (informative) A-deviations................................................................................................................... 92

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive2006/42/EC aimed to be covered ...................................................... 98

Annex ZB (informative) Relationship between this European Standard and the ecodesign

requirements of Commission Regulation (EU) [2015/1189] [L 193] aimed to be

covered........................................................................................................................................................... 100

Annex ZC (informative) Relationship between this European Standard and the energy

labelling requirements of Commission Delegated Regulation (EU) [2015/1187]

[L 193] aimed to be covered ................................................................................................................... 101

Bibliography ............................................................................................................................................................... 102

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SIST EN 303-5:2021+A1:2023
EN 303-5:2021+A1:2022 (E)
European foreword

This document (EN 303-5:2021+A1:2022) has been prepared by Technical Committee CEN/TC 57

“Central heating boilers”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by May 2023, and conflicting national standards shall be

withdrawn at the latest by May 2023.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document includes Amendment 1 approved by CEN on 14 September 2022.
This document supersedes !EN 303-5:2021".

The start and finish of text introduced or altered by amendment is indicated in the text by tags !".

This document has been prepared under a Standardization Request given to CEN by the European

Commission and the European Free Trade Association and supports essential requirements of

EU Directive(s) / Regulation(s).

For relationship with EU Directive(s) / Regulation(s), see informative Annexes ZA, ZB and ZC, which are

an integral part of this document.

In comparison with EN 303-5:2012, the following technical changes have been made:

— the scope was extended to condensing boilers with a heat output of ≤ 500 kW;

— the scope was extended to boilers with outside combustion air supply at a heat output of ≤ 100 kW;

— requirements for materials, weld joints and wall thicknesses have been revised and adapted to

condensing and room sealed operations;

— general and electrical safety requirements have been revised and adapted to condensing and room

sealed applications;

— tests were revised and new tests for condensing boilers, outside combustion air supply, secondary

emission reduction systems and safety requirements were added;
— Annexes were re-structured;

— Consideration was given to the essential requirements of the Machinery Directive 2006/42/EC and

REGULATION (EU) 2015/1189 (Eco-design) and COMMISSION REGULATION (EU) 2015/1187
(Energy labelling).

The following structure is intended for the European Standards for heating boilers:

— EN 303-1, Heating boilers ― Part 1: Heating boilers with forced draught burners ― Terminology,

general requirements, testing and marking;

— EN 303-2, Heating boilers ― Part 2: Heating boilers with forced draught burners ― Special

requirements for boilers with atomizing oil burners;
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SIST EN 303-5:2021+A1:2023
EN 303-5:2021+A1:2022 (E)

— EN 303-3, Heating boilers ― Part 3: Gas-fired central heating boilers ― Assembly comprising a boiler

body and a forced draught burner;

— EN 303-4, Heating boilers ― Part 4: Heating boilers with forced draught burners ― Special

requirements for boilers with forced draught oil burners with outputs up to 70 kW and a maximum

operating pressure of 3 bar ― Terminology, special requirements, testing and marking;

— EN 303-5, Heating boilers ― Part 5: Heating boilers for solid fuels, manually and automatically stoked,

nominal heat output of up to 500 kW ― Terminology, requirements, testing and marking;

— EN 303-6, Heating boilers ― Part 6: Heating boilers with forced draught burners ― Specific

requirements for the domestic hot water operation of combination boilers with atomizing oil burners

of nominal heat input not exceeding 70 kW;

— EN 303-7, Heating boilers ― Part 7: Gas-fired central heating boilers equipped with a forced draught

burner of nominal heat output not exceeding 1 000 kW;

— EN 304, Heating boilers ― Test code for heating boilers for atomizing oil burners.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the

United Kingdom.
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SIST EN 303-5:2021+A1:2023
EN 303-5:2021+A1:2022 (E)
Introduction
This document is a type-C standard as stated in EN ISO 12100:2010.

The machinery concerned, and the extent to which hazards, hazardous situations and hazardous events

are covered, are indicated in the scope of this document.

This document does deal with boilers which are within the Scope Machinery Directive and boilers that

are outside of the Scope Machinery Directive.

The manufacturer is responsible for identifying all additional hazards outside of the scope of this

document.

When provisions of this type-C standard are different from those which are stated in type-A or -B

standards, the provisions of this type-C standard take precedence over the provisions of the other

standards, for machines that have been designed and built according to the provisions of this type-C

standard.
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SIST EN 303-5:2021+A1:2023
EN 303-5:2021+A1:2022 (E)
1 Scope
1.1 General

This document applies to heating boilers including safety devices up to a nominal heat output of

500 kW which are designed for the burning of solid fuels only and are operated according to the

instructions supplied with the boiler and misuse reasonably foreseeable by the manufacturer.

This document applies also for solid fuel boilers taking the combustion air from outside the building

and room sealed appliances.

This document does deal with significant hazards, hazardous situations and events relevant to heating

boilers used as intended and under the conditions specified in the technical documentation of the boiler

(see Clause 4).

The boilers may operate under natural draught or forced draught. The fuel feed may work manually or

automatically. The boilers may operate in non-condensing operation or condensing operation.

NOTE 1 This document does deal with boilers which are within the scope of the Machinery Directive

2006/42/EC or outside of the scope of the Machinery Directive 2006/42/EC (manual stoked natural draught

boiler).

NOTE 2 There is a risk of freezing condensate in the condensate drainage at low temperatures.

This document contains requirements and test methods for safety, combustion performance, operating

characteristics, marking and maintenance of heating boilers. It also covers all external equipment that

influences the safety systems (e.g. back burning safety device, integral fuel hopper).

This document covers only boilers that include burners as a unit. The document applies to the

combination of a boiler body with a solid fuel burner according to EN 15270:2007 as a unit only wh

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