Residential independent boilers fired by solid fuel - Nominal heat output up to 50 kw - Requirements and test methods

This European Standard specifies requirements relating to the design, manufacture, construction, performance (efficiency and emission), safety, instructions and marking together with associated test methods and test fuels for type testing residential independent boilers fired by solid fuel.
This standard is applicable to hand and automatically fired appliances having nominal heat outputs up to 50 kW, the primary function of which is to provide hot water for central heating and/or domestic use, and which are designed for use only with open vented systems at a working pressure not exceeding 2 bar. In addition to their primary function of providing hot water these appliances also provide space heating to the place of installation. These appliances may burn either solid mineral fuels, peat briquettes or natural or manufactured wood logs or be multi-fuel in accordance with the appliance manufacturer’s instructions.
This standard is not applicable to independent boilers for hot water only production and having heat outputs of less than 5 kW.
This standard is also not applicable to the design and construction of automatic stoking devices.

Heizkessel für feste Brenstoffe - Nennwärmeleistung bis 50 kW - Anforderungen und Prüfungen

Diese Norm gilt für hand- und automatisch beschickte Feuerstätten bis zu einer Nennwärmeleistung von 50 kW, deren Hauptfunktion die Erwärmung von Heiz- und/oder Brauchwasser ist und die ausschließlich für den Einbau in offene Systeme mit einem Arbeitsdruck von höchstens 2 bar verwendet werden. Außer ihrer Hauptfunktion der Erwärmung von Heiz- und Brauchwasser ist die Feuerstätte auch für die Beheizung des Aufstellungsraumes vorgesehen.
Diese Europäische Norm beschreibt Anforderungen an Auslegung, Herstellung, Ausführung, Sicherheit und Leistungsvermögen (Wirkungsgrad und Emission für häuslichen Heizkessel für feste Brennstoffe (hier im folgenden "Feuerstätte(n)" genannt und deren Anleitungen. Weiterhin enthält diese Norm Festlegungen für die Konformitätsbewertung, das heißt Typprüfung (ITT) und werkseigene Produktionskontrolle (FCP) und die Kennzeichnung der Feuerstätten.
Diese Feuerstätten können entweder feste mineralische Brennstoffe, Torfbriketts, Holzbriketts, Scheitholz oder mehrere dieser Brennstoffe nach Anleitung des Feuerstättenherstellers verfeuern.
Diese Norm gilt nicht für Heizkessel, die nur Heiz- und Brauchwasser erwärmen und solche mit einer Nennwärmeleistung von weniger als 5 kW.
Diese Norm gilt nicht für die Auslegung und Ausführung von automatischen Fördersystemen.

Chaudières domestiques à combustible solide destinées à implantées dans le volume habitable - Puissance calorifique nominale inférieure ou égale à 50 kW - Exigences et méthodes d’essai

La présente norme européenne s’applique aux chaudières domestiques destinées à être implantées
dans le volume habitable à alimentation manuelle et automatique à puissances calorifiques nominales
jusqu’à 50 kW, dont la fonction principale est de fournir de l’eau chaude à des fins de chauffage
central et / ou pour usage domestique. Elles ne sont conçues que pour être utilisées avec des
systèmes à expansion ouverts à une pression de service ne dépassant pas 2 bars. Outre leur
fonction principale de fournir de l’eau chaude, ces appareils fournissent également de la chaleur dans
l'espace où ils sont installés.
La présente Norme européenne spécifie les exigences relatives aux instructions de conception,
fabrication, construction, sécurité, performance (rendement et émission) des chaudières domestiques
à combustible solide destinées à être implantées dans le volume habitable (ci-après désigné par les
«appareils» et fournit les instructions les concernant. En outre, elle fournit également des dispositions
concernant l'évaluation de la conformité (à savoir l’essai de type initial (ITT) et du contrôle de la
production en usine et le marquage de ces produits.
Ces appareils peuvent fonctionner avec des combustibles minéraux solides, des briquettes de tourbe,
des bûches de bois naturelles ou manufacturées ; ils peuvent également fonctionner avec plusieurs
combustibles conformément aux instructions du fabricant de l'appareil.
La présente Norme ne s’applique pas aux bouilleurs indépendants uniquement destinés à la
production d’eau chaude à puissances calorifiques inférieures à 5 kW.
La présente norme ne s’applique également pas à la conception et à la construction des dispositifs à
chargement automatique.

Grelni kotli na trdna goriva - Imenska grelna moč do 50 kW - Zahteve in preskusne metode

General Information

Status
Not Published
Public Enquiry End Date
29-Jun-2011
Technical Committee
Current Stage
98 - Abandoned project (Adopted Project)
Start Date
07-Oct-2013
Due Date
12-Oct-2013
Completion Date
07-Oct-2013

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SLOVENSKI STANDARD
oSIST prEN 12809:2011
01-maj-2011

*UHOQLNRWOLQDWUGQDJRULYD,PHQVNDJUHOQDPRþGRN:=DKWHYHLQSUHVNXVQH

PHWRGH

Residential independent boilers fired by solid fuel - Nominal heat output up to 50 kw -

Requirements and test methods

Heizkessel für feste Brenstoffe - Nennwärmeleistung bis 50 kW - Anforderungen und

Prüfungen

Chaudières domestiques à combustible solide destinées à implantées dans le volume

habitable - Puissance calorifique nominale inférieure ou égale à 50 kW - Exigences et

méthodes d’essai
Ta slovenski standard je istoveten z: prEN 12809
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.100.30 Grelniki na trdo gorivo Solid fuel heaters
oSIST prEN 12809:2011 en,fr,de

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

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oSIST prEN 12809:2011
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oSIST prEN 12809:2011
EUROPEAN STANDARD
DRAFT
prEN 12809
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2011
ICS 91.140.10 Will supersede EN 12809:2001
English Version
Residential independent boilers fired by solid fuel - Nominal heat
output up to 50 kw - Requirements and test methods

Chaudières domestiques à combustible solide destinées à Heizkessel für feste Brenstoffe - Nennwärmeleistung bis 50

implantées dans le volume habitable - Puissance kW - Anforderungen und Prüfungen
calorifique nominale inférieure ou égale à 50 kW -
Exigences et méthodes d'essai

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 295.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland 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
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12809:2011: E

worldwide for CEN national Members.
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oSIST prEN 12809:2011
prEN 12809:2011 (E)
Contents Page

Foreword ............................................................................................................................................................. 4

1 Scope...................................................................................................................................................... 5

2 Normative references ........................................................................................................................... 5

3 Terms and definitions ........................................................................................................................... 6

4 Materials, design and construction ................................................................................................... 11

4.1 Production documentation ................................................................................................................ 11

4.2 General construction requirements .................................................................................................. 12

4.3 Boilers constructed of steel ............................................................................................................... 13

4.4 Boilers constructed of cast iron ........................................................................................................ 15

4.5 Boiler shell tappings ........................................................................................................................... 16

4.6 Draining of boiler shell ....................................................................................................................... 17

4.7 Boiler waterways ................................................................................................................................. 17

4.8 Combustion air supply ....................................................................................................................... 18

4.9 Ash-pit door and firedoor ................................................................................................................... 18

4.10 Bottomgrate ......................................................................................................................................... 18

4.11 Ashpan and ash removal.................................................................................................................... 19

4.12 Control of flue gas .............................................................................................................................. 19

4.13 Flue draught test point ....................................................................................................................... 19

4.14 Fan cut-out safety device ................................................................................................................... 19

4.15 Flue spigot or socket .......................................................................................................................... 19

4.16 Front firebars and/or deepening plate .............................................................................................. 20

4.17 Flueways .............................................................................................................................................. 20

4.18 Provision for cleaning boiler heating surfaces, and flue connector ............................................. 20

5 Safety requirements ............................................................................................................................ 20

5.1 Temperature in integral fuel storage container ............................................................................... 20

5.2 Temperature of adjacent combustible materials ............................................................................. 20

5.3 Strength and leaktightness of boiler shell ....................................................................................... 20

5.4 Operating tools .................................................................................................................................... 21

5.5 Fan cut-out safety device ................................................................................................................... 21

5.6 Electrical safety ................................................................................................................................... 21

6 Performance requirements ................................................................................................................ 21

6.1 Refuelling interval at nominal heat output ....................................................................................... 21

6.2 Efficiency ............................................................................................................................................. 22

6.3 Flue gas temperature .......................................................................................................................... 22

6.4 Nominal heat output ........................................................................................................................... 22

6.5 Flue draught ........................................................................................................................................ 23

6.6 Slow combustion and recovery ......................................................................................................... 24

6.7 Emissions ............................................................................................................................................ 24

7 Appliance instructions ....................................................................................................................... 25

7.1 General ................................................................................................................................................. 25

7.2 Installation instructions...................................................................................................................... 25

7.3 User operating instructions ............................................................................................................... 26

8 Evaluation of conformity .................................................................................................................... 27

8.1 General ................................................................................................................................................. 27

8.2 Initial type testing ................................................................................................................................ 27

8.3 Factory production control (FPC) ..................................................................................................... 31

9 Marking ................................................................................................................................................ 33

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prEN 12809:2011 (E)

Annex A (normative) Test methods ................................................................................................................ 36

Annex B (normative) Test fuels and recommended fuels ............................................................................ 65

Annex ZA (informative) Clauses of this European Standard addressing the provisions of

the EU Construction Products Directive .......................................................................................... 70

Bibliography ..................................................................................................................................................... 82

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oSIST prEN 12809:2011
prEN 12809:2011 (E)
Foreword

This document (prEN 12809:2011) has been prepared by Technical Committee CEN/TC 295

“Residential solid fuel burning appliances”, the secretariat of which is held by BSI.

This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12809:2001.

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(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this

document.

This document is a revision of the published standard EN 12809:2001 following comments received at

its 5 year review.
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oSIST prEN 12809:2011
prEN 12809:2011 (E)
1 Scope

This European Standard is applicable to hand and automatically fired residential independent boilers

having nominal heat outputs up to 50 kW, the primary function of which is to provide hot water for

central heating and/or domestic use, and which are designed for use only with open vented systems

at a working pressure not exceeding 2 bar. In addition to their primary function of providing hot water

these appliances also provide space heating to the place of installation.

This European Standard specifies requirements relating to the design, manufacture, construction,

safety and performance (efficiency and emission) of residential independent boilers fired by solid fuel

(hereafter referred to as “appliance(s)”) and provides instructions for them. Furthermore, it also gives

provisions for evaluation of conformity (i.e. initial type testing (ITT) and factory production

control (FPC) and marking of these products.

These appliances may burn either solid mineral fuels, peat briquettes or natural or manufactured

wood logs or be multi-fuel in accordance with the appliance manufacturer’s instructions.

This standard is not applicable to independent boilers for hot water only production and having heat

outputs of less than 5 kW.

This standard is also not applicable to the design and construction of automatic stoking devices.

2 Normative references

This European Standard incorporates by dated or undated reference, provisions from other

publications. These normative references are cited at the appropriate places in the text and the

publications are listed hereafter. For dated references, subsequent amendments to or revisions of any

of these publications apply to this European Standard only when incorporated in it by amendment or

revision. For undated references the latest edition of the publication applies (including amendments).

EN 1561:1997, Founding — Grey cast irons
EN 1563:1997, Founding — Spheroidal graphite cast irons

EN 10025:1993, Hot rolled products of non-alloy structural steels — Technical delivery conditions

EN 10027-2:1992, Designation systems for steels — Part 2: Numerical system

EN 10028-2:1992, Flat products made of steels for pressure purposes — Part 2: Non-alloy and

alloysteels with specified elevated temperature properties

EN 10029:1991, Hot rolled steel plates 3 mm thick or above — Tolerances on dimensions, shape and

mass

EN 10088-2:1995, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip for

general purposes

EN 10111:1998, Continuously hot–rolled low carbon steel sheet and strip for cold forming —

Technical delivery conditions
EN 10120:1996, Steel sheet and strip for welded gas cylinders

EN 60335-2-102, Household and similar electrical appliances — Safety — Particular requirements for

gas, oil and solid-fuel burning appliances having electrical connections
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ISO 7-1:2000, Pipe threads where pressure-tight joints are made on the threads —
Part 1: Dimensions, tolerances and designation

ISO 7-2:2000, Pipe threads where pressure-tight joints are made on the threads — Part 2: Verification

by means of limit gauges

ISO 228-1:1994, Pipe threads where pressure-tight joints are not made on the threads —

Part 1: Dimensions, tolerances and designation

ISO 228-2:1987, Pipe threads where pressure-tight joints are not made on the threads —

Part 2: Verification by means of limit gauges

ISO 331:1983, Coal — Determination of moisture in the analysis sample — Direct gravimetric method

ISO 334:1992, Solid mineral fuels — Determination of total sulfur — Eschka method

ISO 351:1996, Solid mineral fuels — Determination of total sulfur — High temperature combustion

method
ISO 501:1981, Coal — Determination of the crucible swelling number
ISO 562:1998, Hard coal and coke — Determination of volatile matter

ISO 609:1996, Solid mineral fuels — Determination of carbon and hydrogen — High temperature

combustion method
ISO 687:1974, Coke — Determination of moisture in the analysis sample
ISO 1171:1997, Solid mineral fuels — Determination of ash content

ISO 1928:1995, Solid mineral fuels — Determination of gross calorific value by the bomb calorimetric

method, and calculation of net calorific value

CEN/TS 15883:2009, Residential solid fuel burning appliances — Emission test methods

3 Terms and definitions

For the purposes of this European Standard, the following terms and definitions apply.

3.1
air inlet control

manual or automatic device to control the quantity of air supplied for combustion

3.2
ashpan
removable receptacle shaped to receive the residue falling from the firebed
3.3
ashpit
enclosed chamber designed to receive the residue or the ashpan
3.4
basic firebed
quantity of glowing embers which ensures ignition of the test fuel to be charged
NOTE The basic firebed may be specified by the manufacturer.
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3.5
boiler

vessel in which water is heated, intended for fitting in or forming an integral part of a solid fuel

appliance
3.6
boiler waterways
space within a boiler which contains water
3.7
bottomgrate

part of the appliance at the base of the firebox which supports the fire-bed through which the residue

falls into the ashpan or ashpit and through which combustion air and/or combustion gases may be

drawn
3.8
burning rate
reduction in the mass of fuel per unit of time
3.9
charging door
door which covers the refuelling opening
3.10
combustion air

air supplied to the firebox, which is entirely or partially used to burn the fuel

3.11
combustion air selector

device for adjusting the primary and/or secondary air according to the type of fuel burned

3.12
combustion control device

mechanism for setting the primary and/or secondary air in accordance with the burning rate required

3.13
combustion gases
compounds in gaseous form produced inside an appliance when fuel is burned
3.14
damper
mechanism to change the resistance to flow of the combustion gases
3.15
de-ashing

process of clearing a fuelbed and discharging residue into the collecting receptacle

3.16
de-ashing mechanism
device to agitate or disturb the ash to facilitate its removal from the firebed

NOTE It may also be used to change the bottomgrate operating position on some appliances.

3.17
direct water system

hot water system in which stored domestic hot water is heated directly by hot water circulating from

the boiler
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prEN 12809:2011 (E)
3.18
draught regulator

inlet device for admission air downstream of the firebed, enabling the flue draught to be controlled

3.19
efficiency

ratio of total heat output to total heat input during the test period expressed as a percentage

3.20
firebed; fuelbed
fuel contained in the firebox
3.21
firebox; combustion chamber
that part of the appliance in which fuel is burned
3.22
firebox opening
aperture in the firebox through which the appliance may be fuelled
3.23
firedoor

door through which the fire may be viewed and which may be opened to allow refuelling of the firebed

3.24
flue draught

differential between the static air pressure in the place of installation and the static pressure at the flue

gas measurement point
3.25
flue gases

gaseous compounds leaving the appliance flue spigot and entering the flue gas connector

3.26
flue gas adaptor
fitting which allows for variations in size and shape of the flue components
3.27
flue gas connector

duct through which flue gases are conveyed from the appliance into the chimney flue

3.28
flue gas mass flow
mass of flue gas drawn off from the appliance per unit of time
3.29
flue gas temperature
temperature of the flue gas at the specified point in the measurement section
3.30
flue spigot; flue socket

integral part of the appliance for connecting the flue gas connector thus permitting the deliberate

escape of products of combustion into the chimney flue
3.31
flueway

that part of the appliance designed to convey combustion gases from the firebox to the flue spigot

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prEN 12809:2011 (E)
3.32
front firebars; deepening plate

grating or plate fitted at the front of the firebox opening to prevent spillage of fuel and ash or to

change the firebox capacity, or both
3.33
fuel hopper
fuel store integral with the appliance from which fuel is fed to the firebox
3.34
fuel regulator
device for controlling the size of the firebed
3.35
heat input
quantity of energy, which the fuel provides to the appliance
3.36
heat output
quantity of useful heat released by the appliance
3.37
indirect water system

hot water system in which stored domestic hot water is heated by a primary heater through which hot

water from the boiler is circulated without mixing of the primary (heating) water and the stored

domestic hot water
3.38
maximum water operating pressure

limiting water pressure up to which the boiler of an appliance can be safely operated

3.39
nominal heat output

total heat output of the appliance quoted by the manufacturer and achieved under defined test

conditions when burning the specified test fuel
3.40
operating tool

device supplied with the appliance for handling movable, adjustable and/or hot components

3.41
primary air
combustion air, which passes through the fuel bed

NOTE Primary air does not necessarily have separate inlets neither does it necessarily pass through a

bottomgrate
3.42
recovery capability

ability of the fire to re-ignite existing or newly charged fuel after a defined burning period without

external assistance
3.43
recommended fuel

fuel of commercial quality listed in the appliance manufacturer's instructions, and shown to achieve

the claimed performance when tested in accordance with this European Standard
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3.44
refuelling interval

period of time for which the combustion may be maintained in the appliance with a single load of fuel,

without intervention by the user
3.45
residue
ashes, including combustibles, which collect in the ashpit
3.46
secondary air

air supplied for the purpose of completing the combustion of gases leaving the fuel bed

3.47
slow-combustion capability

ability of an appliance to continue operating at a low burning rate for a specified minimum period

without any input of fuel and without any interference with the combustion process, in such a manner

that the firebed can be recovered at the end of this period
3.48
slow combustion heat output
heat output achieved during the test period under slow combustion conditions
3.49
solid fuel

natural or manufactured solid mineral fuels, natural or manufactured wood logs and peat briquettes

3.50
solid mineral fuel
coal, lignite, coke and fuels derived from these
3.51
space-heating output
heat output provided by convection and radiation to the room
3.52
start-up device

mechanism to divert the path of the heating gases and/or change the combustion air opening cross

section during the ignition period
3.53
steady-state condition

stage at which values to be measured in successive equal periods of time do not exhibit significant

change
3.54
integral fuel storage container

enclosed area forming part of the appliance, but not connected directly to the fuel charging area, in

which fuel is stored prior to it being physically transferred by the user to the fuel charging position

3.55
test fuel

fuel of commercial quality being characteristic of its type to be used for testing appliances

3.56
thermostat

temperature sensitive device which automatically changes the combustion air inlet cross-sectional

area
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3.57
total heat output
rate of useful heat released by the appliance
3.58
type test pressure
pressure to which all waterways of the test appliance are subjected
3.59
water-heating output
heat output to water averaged during the test period
3.60
working surfaces

all surfaces of an appliance designed to transmit heat to the surrounding atmosphere

NOTE All external surfaces of a heating boiler including the flue gas connector in accordance with this

standard are classified as working surfaces because they are designed to transmit heat to the room in which the

appliance is installed.
4 Materials, design and construction
4.1 Production documentation

The type of appliance submitted for testing shall be stated and the appliance shall be tested using the

standard appropriate to that claim.

The parameters and characteristics considered in making the decisions in relation to either the family

or range of appliances to be submitted for initial type testing (see 8.2.1) shall be recorded. Where

changes are made to an appliance in the design, the raw material, the supplier of the components, or

in the production process, which would significantly alter the performance characteristics of the

appliance, especially in respect of one or more of the list of characteristics detailed in Table 9 and

Table 10, (see 8.2.2) these shall be recorded. A copy of the parameters and characteristics

considered in making the decisions shall be included in the production documentation for each

appliance.

To identify the appliance, the manufacturer shall have available documents and/or scaled assembly

drawings showing the basic design and construction of the appliance. The documentation and/or the

drawings shall include at least the following information:
 the specification of the materials used in the construction of the appliance;

 the manufacturer’s declared nominal heat output in kW using fuels recommended by the

manufacturer together with the declared minimum refueling intervals for these fuels;

 the welding process used in the manufacture of the boiler shell;
NOTE The symbol for the type of weld used is sufficient.
 the permissible maximum operating water temperature in °C;
 the permissible maximum water operating pressure in bar;
 the type test pressure in bar;
 the water heating output in kW.
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4.2 General construction requirements
4.2.1 Design, manufacture and assembly

The shape and dimensions of the components and equipment and the method of design and

manufacture, and if assembled on site the method of assembly and installation, shall ensure that

when operated in accordance with the appropriate test(s) and exposed to the associated mechanical,

chemical and thermal stresses, the appliance shall operate reliably and safely such that during normal

operation, no combustion gases posing a hazard can escape into the room in which the appliance is

installed nor can embers fall out.

Component parts such as covers, operating controls, safety devices and electrical accessories shall

be arranged in such a way that their surface temperatures, under the test conditions described

in A.4.7, do not exceed those specified either by the manufacturer or in the relevant component part

standard.

NOTE 1 Because the entire heat dissipating surfaces of the appliance including the flue spigot/socket and the

flue gas connector are working surfaces, there is no requirement for limiting the surface temperature of the

appliance.

The appliance shall meet the requirements detailed in 4.3 to 4.18 as appropriate to the material of

construction and intended usage.

The appliance shall be capable of operating safely at a permissible maximum water operating

pressure as declared by the manufacturer of up to but not exceeding 2 bar and shall meet the

requirements of the type pressure test described in 5.3.

Provision shall be made for parts which act as a seal to be located securely by means of bolts,

gaskets or welding; to prevent the ingress or leakage of air, water or combustion products. Adjacent

surfaces between metal components in the firebox or flueways shall be gastight.

Where a seal is made with fire-cement, the cement shall be supported by adjacent metal surfaces.

Component parts, which require periodic replacement and/or removal, shall be either designed or

identified so as to ensure correct fitting.

No part of the appliance shall comprise of or contain asbestos. Hard solder containing cadmium in its

formulation shall not be used.

Where thermal insulation is used, it shall be made of non-combustible material and shall not be a

known hazard to health in its applied position.

NOTE 2 The thermal insulation should withstand normal thermal and mechanical stresses.

4.2.2 Durability

The durability aspects of the appliance shall be deemed to be satisfied if it is shown to meet the

constructional requirements specified in 4.3 to 4.18, the safety requirements specified in Clause 5 and

the performance requirements specified in Clause 6 of this standard.

NOTE The long practice with these products shows that such an approach for dealing with durability is

sufficient.
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4.3 Boilers constructed of steel
4.3.1 Parts subject to water pressure

One or more of the steel materials complying at least with the specifications given in Table 1 shall be

used for the manufacture of those parts of the appliance subj
...

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