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prEN 303-2

(Main)

Heating boilers - Part 2: Heating boilers with forced draught burners - Special requirements for boilers with atomizing oil burners

Heating boilers - Part 2: Heating boilers with forced draught burners - Special requirements for boilers with atomizing oil burners

This document is applicable to boilers used for central heating in accordance with EN 303-1 up to a nominal heat output of 1 000 kW and EN 303-4 up to a nominal heat output of 70 kW with forced draught burners in accordance with EN 267 that are designed for operating with liquid fuels.
The performance requirements of this document apply to type testing to heating boilers (standard, low temperature and condensing boilers) which are tested on a test rig in accordance with the test code given in EN 304.
This document applies also to room sealed boilers as defined in EN 15035 regarding efficiency and emissions.
This document can also be used as the basis for evaluation of boiler-/burner units.

Heizkessel - Teil 2: Heizkessel mit Gebläsebrennern - Spezielle Anforderungen an Heizkessel mit Ölzerstäubungsbrennern

Dieses Dokument gilt für Kessel von Zentralheizungen nach EN 303-1:2017 bis zu einer Nennwärmeleistung von 1 000 kW und nach EN 303-4:1999 bis zu einer Nennwärmeleistung von 70 kW mit Gebläsebrennern nach EN 267:2020, die für den Betrieb mit flüssigen Brennstoffen konzipiert wurden.
Die Leistungsanforderungen dieses Dokuments gelten für die Typ-Prüfung von Heizkesseln (Standard-, Niedertemperatur- und Brennwertkessel), die auf einem Prüfstand nach den Prüfregeln in EN 304:2017 geprüft werden.
Dieses Dokument gilt auch für raumluftunabhängige Kessel nach EN 15035 in Bezug auf Wirkungsgrad und Emissionen.
Dieses Dokument kann auch als Grundlage für die Bewertung von Heizkessel-Brenner-Einheiten dienen.

Chaudières de chauffage - Partie 2 : Chaudières avec brûleurs à air soufflé - Prescriptions spéciales pour chaudières avec brûleurs fioul à pulvérisation

Le présent document s'applique aux chaudières de chauffage central conformes à l'EN 303-1:2017 jusqu'à une puissance utile nominale de 1 000 kW et à l'EN 303-4:1999 jusqu'à une puissance utile nominale de 70 kW, pourvues de brûleurs à air soufflé conformes à l'EN 267:2020 et conçues pour fonctionner avec des combustibles liquides.
Les exigences de performance du présent document s'appliquent aux essais de type de chaudières de chauffage (chaudières standard, à basse température et à condensation) soumises à essai sur un banc d'essai conformément aux règles d'essai de l'EN 304:2017.
Le présent document s'applique également aux chaudières étanches définies dans l'EN 15035, pour ce qui concerne le rendement et les émissions.
Le présent document peut aussi servir de base pour l'évaluation des assemblages de chaudière/brûleur.

Kotli za ogrevanje - 2. del: Kotli za ogrevanje z ventilatorskimi gorilniki - Posebne zahteve za kotle z razprševalnimi oljnimi gorilniki

General Information

Status
Not Published
Publication Date
03-Sep-2025
ICS
91.140.10 - Central heating systems
Technical Committee
CEN/TC 57 - Central heating boilers
Drafting Committee
CEN/TC 57/WG 2 - Test method for the determination of efficiency at a partial load of 30%
Current Stage
4599 - Dispatch of FV draft to CMC - Finalization for Vote
Start Date
21-Mar-2025
Due Date
04-Jun-2024
Completion Date
21-Mar-2025
Directive
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
Mandate
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
Ref Project
oSIST prEN 303-2:2023 - Heating boilers - Part 2: Heating boilers with forced draught burners - Special requirements for boilers with atomizing oil burners

Relations

Revises
EN 303-2:2017 - Heating boilers - Part 2: Heating boilers with forced draught burners - Special requirements for boilers with atomizing oil burners
Effective Date
19-Jan-2023

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Standards Content (Sample)


SLOVENSKI STANDARD
01-marec-2023
Kotli za ogrevanje - 2. del: Kotli za ogrevanje z ventilatorskimi gorilniki - Posebne
zahteve za kotle z razprševalnimi oljnimi gorilniki
Heating boilers - Part 2: Heating boilers with forced draught burners - Special
requirements for boilers with atomizing oil burners
Heizkessel - Heizkessel mit Gebläsebrennern - Teil 2: Spezielle Anforderungen an
Heizkessel mit Ölzerstäubungsbrennern
Chaudières de chauffage - Chaudières avec brûleurs à air soufflé - Partie 2 :
Prescriptions spéciales pour chaudières avec brûleurs fioul à pulvérisation
Ta slovenski standard je istoveten z: prEN 303-2
ICS:
27.060.10 Gorilniki na tekoče in trdo Liquid and solid fuel burners
gorivo
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.100.40 Grelniki na tekoče gorivo Liquid fuel heaters
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2023
ICS 91.140.10 Will supersede EN 303-2:2017
English Version
Heating boilers - Part 2: Heating boilers with forced
draught burners - Special requirements for boilers with
atomizing oil burners
Chaudières de chauffage - Chaudières avec brûleurs à Heizkessel - Heizkessel mit Gebläsebrennern - Teil 2:
air soufflé - Partie 2 : Prescriptions spéciales pour Spezielle Anforderungen an Heizkessel mit
chaudières avec brûleurs fioul à pulvérisation Ölzerstäubungsbrennern
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 57.
If this draft becomes a European Standard, 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.

This draft European Standard 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 303-2:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
3.1 General terms and definitions . 5
3.2 Terms and definitions relevant to eco-design and labelling regulations terms . 6
4 Performance requirements . 6
4.1 General . 6
4.2 Boiler efficiency . 6
4.2.1 Air ratio for efficiency measurement . 6
4.2.2 Boilers of heat output ≤ 70 kW . 6
4.2.3 Boilers of heat output > 70 kW and ≤ 400 kW . 6
4.2.4 Boilers of heat output > 400 kW and ≤ 1 000 kW . 7
4.3 Draught requirements and gas side resistance. 7
4.4 Emission values . 7
4.5 Standby heat loss . 7
4.6 Auxiliary electricity consumption . 8
4.7 Sound power level . 8
4.8 Samples for testing . 8
5 Material performance . 8
5.1 General . 8
5.2 Test specimen and test duration . 8
5.3 Adjustment values for the test. 9
6 Marking and instructions . 10
6.1 Information for disassembly, recycling and disposal . 10
6.2 Annual energy consumption . 10
6.2.1 Rated heat output (P and P ) . 10
rated 4
6.2.2 Calculation of the annual energy consumption for space heating (Q ) (GCV) . 11
HE
6.2.3 Water heating energy efficiency and energy consumption of combination boilers for
water heating mode. 11
6.2.4 Ignition burner power consumption (GCV) (P ) . 12
ign
Annex AA (informative) Product Information related to Eco-design Regulation and Labelling
Regulation . 13
⁠⁠AA.1 Product information – technical parameters required by the ErP Regulation
(813/2013) . 13
⁠⁠⁠AA.2 Product information – technical parameters required by the Labelling Regulation
(811/2013) . 15
Annex A (normative) Assembly criteria . 17
Annex B (informative) Example of test evaluation for a 3-months duration test . 19
Annex ZA (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No [813/2013] aimed to be covered . 21
Annex ZB (informative) Relationship between this European Standard and the energy
labelling requirements of Commission Delegated Regulation (EU) No 811/2013
aimed to be covered . 22
Bibliography . 25

European foreword
This document (prEN 303-2:2023) has been prepared by Technical Committee CEN/TC 57 “Central
heating boilers”, the secretariat of which is held by DIN.
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 and ZB, which is an
integral part of this document.
This document supersedes EN 303-2:2017.
The main technical changes compared to EN 303-2:2017 are the following:
a) new Annex AA for information in regard to the labelling was added;
b) new clause marking and instructions was added;
c) technical and editorial changes related to ecotest were introduced in order to bring in more clarity
and less deviations of test results;
d) updated references;
e) updated normative references.
The following structure is intended for the 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
— 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 304, Heating boilers — Test code for heating boilers for atomizing oil burners
— 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
1 Scope
This document is applicable to boilers used for central heating in accordance with EN 303-1:2017 up to
a nominal heat output of 1 000 kW and EN 303-4:1999 up to a nominal heat output of 70 kW with forced
draught burners in accordance with EN 267:2020 that are designed for operating with liquid fuels.
The performance requirements of this document apply to type testing to heating boilers (standard, low
temperature and condensing boilers) which are tested on a test rig in accordance with the test code given
in EN 304:2017.
This document applies also to room sealed boilers as defined in EN 15035 regarding efficiency and
emissions.
This document can also be used as the basis for evaluation of boiler-/burner units.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 267:2020, Forced draught burners for liquid fuels
EN 303-1:2017, Heating boilers — Part 1: Heating boilers with forced draught burners - Terminology,
general requirements, testing and marking
EN 304:2017, Heating boilers — Test code for heating boilers for atomizing oil burners
EN 15036-1:2006, Heating boilers — Test regulations for airborne noise emissions from heat generators —
Part 1: Airborne noise emissions from heat generators
EN 15316-4-1:2017, Energy performance of buildings — Method for calculation of system energy
requirements and system efficiencies — Part 4-1: Space heating and DHW generation systems, combustion
systems (boilers, biomass), Module M3-8-1, M8-8-1
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 303-1:2017 and the following
apply.
3.1 General terms and definitions
3.1.1
range rated boiler
appliance where the heat output is fixed in a given range
3.1.2
modulating boiler
appliance where the heat output is varying in a given range automatically
3.1.3
standby heat loss
P
stby
heat loss of a boiler space heater, boiler combination heater in operating mode without heat demand,
expressed in kW
3.1.4
combination boiler (combi boiler)
boil
...

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

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;
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Heating boilers - Part 6: Heating boilers with forced draught burners - Specific requirements for the domestic hot water operation and energy performance of water heaters and combination boilers with atomizing oil burners of nominal heat input not exceeding 70 kW
SIST EN 303-6:2019

This document is composed of two parts.
The first part supplements EN 303-1, EN 303-2, EN 303-4 and EN 304, hereafter called boiler standards. It specifies the supplementary requirements and tests for the construction, safety, rational use of energy, fitness for purpose, classification and marking related to the domestic hot water operation of oil-fired water heaters and combination boilers.
The domestic hot water is produced on either the instantaneous or storage principle. The domestic hot water production is integrated or coupled, the whole being marketed as a single unit.
The second part covers the energy performance of domestic hot water production of the appliances covered by the first part.
This second part sets out a method for assessing the energy performance of the appliances. It defines a number of daily tapping cycles for each domestic hot water use such as kitchen, shower, bath and a combination of these, together with corresponding test procedures, enabling the energy performances of combination boilers and water heaters to be compared and matched to the needs of the user.
The heat output of the appliances covered by this standard does not exceed 400 kW.
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SIST EN 304:2018

This European Standard applies to the determination of the performances of heating boilers and combi boilers fired by liquid fuels. The requirements for the heating performances are laid down in EN 303 1:2016 and EN 303 2:2016.
This test code includes the requirements and recommendations for carrying out and evaluating the procedure for testing boilers and also the details of the technical conditions under which the tests will be carried out.
The requirements and the performance of testing for the sanitary hot water production of combi boilers are laid down in EN 303 6.

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SIST EN 303-1:2017

This European Standard applies to boilers used for central heating (heating boilers) with forced draught burners with a nominal heat output not exceeding 1 000 kW, which are operated either with negative pressure (natural draught boilers) or with positive pressure (pressurized boiler) in the combustion chamber, in accordance with the boiler instructions.
This European Standard specifies the necessary terminology, the requirements on the materials and testing of them, and marking requirements for heating boilers.
Particular requirements for boilers that can be used with open vented systems are contained in EN 303 4.
The requirements of this standard apply to heating boilers that are tested on an authorized test rig.
Boilers in accordance with this standard are designed for the heating of central heating installations in which the heat carrier is water, and the maximum allowable operating temperature of which is restricted to 100 °C. The maximum allowable operating pressure is 8 bar.
For boilers and water heaters (storage or continuous flow heater) this standard only applies to the parts which are necessarily subject to the operating conditions of the heating boiler (heating part).
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SIST EN 303-2:2017

This European Standard is applicable to boilers used for central heating in accordance with prEN 303 1:2016 up to a nominal heat output of 1 000 kW and EN 303 4 up to a nominal heat output of 70 kW with forced draught burners in accordance with EN 267 that are designed for operating with liquid fuels.
The performance requirements of this standard apply to type testing to heating boilers (standard, low temperature and condensing boilers) which are tested on a test rig in accordance with the test code given in EN 304.
This standard applies also to room sealed boilers as defined in EN 15035 regarding efficiency and emissions.
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EN 14394:2005+A1:2008(Main)
Heating boilers - Heating boilers with forced draught burners - Nominal heat output not exceeding 10 MW and maximum operating temperature of 110 °C
SIST EN 14394:2006+A1:2008

This European Standard specifies the requirements and test methods for the design, manufacturing, safe operation and the rational energy usage for standard boilers and low temperature boilers (with "boiler" in the sense of "boiler body") from steel and cast iron to be equipped with separately marketed forced draught burners according to the relevant burner standards (for automatic forced draught burners for gaseous fuels see EN 676 and for atomising oil burners see EN 267) up to a nominal heat output of 10 MW. They are operated, either with negative pressure (natural draught boiler) or with positive pressure (pressurised boiler) in the combustion chamber, in accordance with the boiler manufacturer's instructions."
This European Standard specifies requirements for boilers with normal operating temperatures between 100 °C and 110 °C and has a "dual structure":
-   For boilers where the shut off temperature of the safety temperature limiter does not exceed 110 °C the Pressure Equipment Directive (PED) requires" Sound Engineering Practice",
-   For boilers where the shut off temperature of the safety temperature limiter exceeds 110 °C this European Standard specifies the requirements of the PED as stated in Annex ZB.
NOTE 1   The "maximum allowable temperature TS" is defined in the PED and its Guidelines."
Boilers in accordance with this European Standard are designed for the heating of central heating installations in which the heat carrier is water, and the maximum allowable operating temperature of which is up to 110 C and the maximum safety temperature limiter of 120 C. The maximum allowable operating pressure is 10 bar.
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SIST EN 15456:2008

This European Standard applies to heating boilers (e.g. with forced-draught burners (unit)) and burners equipped with a fan including all components specified by the manufacturer to be required for the designed boiler operation.
This European Standard also applies to heating boilers sold without burners.
This European Standard covers the required definitions, the system boundaries, the measurements for the determination of the electrical power consumption and, where applicable, the water side resistance in order to establish the electric auxiliary energy for:
   Oil-fired forced-draught burners in accordance with EN 267;
   Automatic forced-draught burners for gaseous fuels in accordance with EN 676;
   Flued oil stoves with vaporizing burners in accordance with EN 1;
   Heating boilers sold without burners for:
   Oil-fired forced-draught burners in accordance with EN 303-1 [6], EN 303-2 [7] and EN 304;
   Condensing boilers for liquid fuels in accordance with EN 15034;
   Room sealed boilers for fuel oil in accordance with EN 15035;
   Heating boilers - Heating boilers with forced-draught burners - Nominal heat output not exceeding 10 MW and maximum operating temperature of 110 °C in accordance with EN 14394;
   Pellet burners for small heating boilers in accordance with EN 15270.
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EN 15036-1:2006(Main)
Heating boilers - Test regulations for airborne noise emissions from heat generators - Part 1: Airborne noise emissions from heat generators
SIST EN 15036-1:2007

This European Standard specifies test methods for airborne noise emissions from heat generators in a test laboratory or at the place of installation.
The test methods described in this European Standard, however, may be used for measuring the airborne noise emissions of the appliances and functions listed below.
This European Standard applies to following appliances regardless of their heat output and the fuel used:
   wall-mounted and floor-standing heating appliances;
   forced-draught burners;
   boilers/forced-draught burner units;
   boilers with freely allocated forced-draught burners;
   pellet burners.
According to this European Standard the manufacturer is allowed to choose an appropriate category of testing for the measured appliance.
This European Standard does not apply to:
   appliances used exclusively for heating drinking-water;
   function of heating drinking-water in so-called combined water-heaters;
   heat generators which work with air as the heat transfer medium;
   electrical heating appliances;
   structure-borne noise;
   sound transmission along the flue gas path.

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EN 15036-2:2006(Main)
Heating boilers - Test regulations for airborne noise emissions from heat generators - Part 2: Flue gas noise emissions at the outlet of the heat generator
SIST EN 15036-2:2007

This European Standard applies to heat generators according to EN 15036-1, which are connected to chimneys/ducts which discharge combustion products via a duct into open air.
The data measured according to this European Standard will probably be different from the noise radiated from the end of the chimney.
Readings from forced-draught burners complying with EN 267 or EN 676 are only applicable in practice if they have been taken in conjunction with a boiler. Noise emitted into chimneys/ducts by heat generators operating independently of indoor air can also be measured in accordance with this European Standard.
Boilers supplied with combined air inlet and exhaust terminal configuration where ducts are within an external wall can be measured according to one of the test methods detailed in EN 15036-1.
This European Standard describes the objective procedure for determining sound power levels LW, at the outlet of a heat generator that is emitting broad-band, narrow-band, or tonal continuous sound.
This European Standard is applicable to boilers designed to be connected to a chimney or flue duct with a duct size greater than or equal to 0,06 m and whose mean flue gas flow at the microphone head is less than 5 m/s.
This European Standard only applies for test purposes under laboratory conditions.

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CEN
EN 303-4:1999(Main)
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
SIST EN 303-4:1999

This standard is applicable to heating boilers with forced draught oil burners up to a nominal heat output of 70 kW. They are operated, either with negative pressure (natural draught boiler) or with positive pressure (pressurised boiler) in the combustion chamber, in accordance with the boiler manufacturer's instructions. This standard specifies the necessary terminology, the requirements on the materials and testing of them, and marking requirements for heating boilers.

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