oSIST prEN 13240:2011

SLOVENSKI STANDARD
01-maj-2011
Grelniki prostorov na trdna goriva - Zahteve in preskusne metode
Room heaters fired by solid fuel - Requirements and test methods
Raumheizer für feste Brennstoffe - Anforderungen und Prüfungen
Poêles à combustible solide - Exigences et méthodes d'essai
Ta slovenski standard je istoveten z: prEN 13240
ICS:
97.100.30 Grelniki na trdo gorivo Solid fuel heaters
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2011
ICS 97.100.30 Will supersede EN 13240:2001
English Version
Room heaters fired by solid fuel - Requirements and test
methods
Poêles à combustible solide - Exigences et méthodes Raumheizer für feste Brennstoffe - Anforderungen und
d'essai Prüfungen
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 13240:2011: E
worldwide for CEN national Members.

Contents Page
Foreword . 3
1 Scope. 4
2 Normative references . 4
3 Terms and definitions . 6
4 Materials, design and construction . 11
4.1 Production documentation . 11
4.2 Construction . 12
5 Safety requirements . 20
5.1 Natural draught . 20
5.2 Operation with open firedoors . 20
5.3 Strength and leaktightness of boiler shells . 21
5.4 Temperature rise in the fuel storage container (other than the fuel hopper) . 21
5.5 Temperature rise of the operating components . 21
5.6 Temperature of adjacent combustible materials . 21
5.7 Thermal discharge control . 21
5.8 Electrical safety . 21
6 Performance requirements . 22
6.1 Flue gas temperature . 22
6.2 Emissions . 22
6.3 Efficiency . 22
6.4 Flue draught . 22
6.5 Recovery . 23
6.6 Refuelling intervals . 24
6.7 Space heating output . 24
6.8 Water heating output . 25
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 . 28
8.3 Factory production control (FPC) . 31
9 Marking . 33
Annex A (normative) Test methods . 35
Annex B (normative) Test fuels and recommended fuels . 71
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU
Construction Products Directive . 76
Bibliography . 88

Foreword
This document (prEN 13240:2011) 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 13240:2001.
This document has been prepared under the mandate M/129 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 13240:2001 following comments received at
its 5 year review.
1 Scope
This European Standard is applicable to freestanding or inset roomheaters fired by solid fuel, without
functional modification, that operate with fire doors either as closed only or as closed or open and
which are listed under categories 1a and 2a of Table 1. This European Standard is also only
applicable to non-mechanically fired roomheaters as listed under categories 1a and 2a of Table 1.
This European Standard specifies requirements relating to the design, manufacture, construction,
safety and performance (efficiency and emission) of roomheaters 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 appliances.
These appliances provide heat into the space where they are installed. Additionally, where fitted with
a boiler, they also provide domestic hot water and/or central heating. These appliances may burn
either solid mineral fuels, peat briquettes, natural or manufactured wood logs or be multi-fuel in
accordance with the appliance manufacturer’s instructions.
This standard is not applicable to appliances with fan assisted combustion air or appliances that are
mechanically fired.
Table 1 — Categorisation of appliances
a) b) c)
Freestanding or Freestanding or inset Inset appliances
inset appliances appliances which have for fireplace recess
without functional functional modification and enclosure
modification
1)
Appliances operating EN 13240 EN 13229 EN 13229
with firedoors closed
2)
Appliances operating EN 13240 EN 13229 EN 13229
with firedoors closed or open
3)
EN 13229 EN 13229 EN 13229
Open fires without firedoors
NOTE Without functional modification means “conversion of a free standing appliance into an insert appliance
by modifications that do not affect combustion”.

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 referred to applies (including
amendments).
EN 1561:1997, Founding — Grey cast irons
EN 1563:1997, Founding — Spheroidal graphite cast iron
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 alloy
steels 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 — Part 2-102: Particular
requirements for gas, oil and solid-fuel burning appliances having electrical connections
ISO 7-1:1994, 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 228-1:2000, 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
ISO 2859 (all parts), Sampling procedures for inspection by attributes
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 grilles
components in the inlet and outlet openings to distribute and direct convection air flow
3.2
air inlet control
manual or automatic device which controls the quantity of air supplied for combustion
3.3
appliance with boiler
heat generator consisting of a room heating component and a water heating component in one unit
3.4
ash content of the fuel
solid matter remaining after the complete combustion of solid fuel
3.5
ashpan
removable receptacle shaped to receive the residue falling from the firebed
3.6
ashpit
enclosed chamber designed to receive the residue or the ashpan
3.7
ashpit loss
part of the residue which is combustible
3.8
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.
3.9
boiler
vessel in which water is heated, intended for fitting in or forming an integral part of a solid fuel
appliance
3.10
boiler flueway
portion of the flueway formed wholly or in part by the surfaces of the boiler
3.11
bottomgrate
part of the appliance at the base of the firebox which supports the firebed through which the residue
falls into the ashpan or ashpit and through which combustion air and/or combustion gases may be
drawn
3.12
bottomgrate bars; firebars
bars supporting the fuelbed, separate or integral with a surrounding frame
3.13
charging door
door which covers the refuelling opening
3.14
combustion air
air supplied to the firebox which is entirely or partially used to burn the fuel
3.15
combustion gases
compounds in gaseous form produced inside an appliance when fuel is burned
3.16
continuous burning appliance
heating appliance designed for slow burning over an extended period of time (e.g. overnight) and
meeting the requirements of the slow combustion test
3.17
de-ashing
process of clearing a fuelbed and discharging the residue into the collecting receptacle
3.18
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.
3.19
direct water system
hot water system in which stored domestic hot water is heated directly by hot water circulating from
the boiler
3.20
draught regulator
inlet device for admission of air downstream of the firebed, enabling the flue draught to be controlled
3.21
efficiency
ratio of total heat output to total heat input during the test period expressed as a percentage during the
test period
3.22
firebox; combustion chamber
that part of the appliance in which the fuel is burned
3.23
firebox opening
aperture in the firebox through which an appliance may be fuelled
3.24
firedoor
door through which the fire may be viewed and which may be opened to allow refuelling of the firebed
3.25
fireplace enclosure
assembly consisting of walls and ceiling of non combustible materials which is built on site to surround
a heat generator and heat exchanger and to form a space from which hot convection air is emitted
into the living space, e.g. by air grilles
3.26
fireplace recess
space formed in a wall or chimney breast constructed from non combustible materials and into which
a heating appliance may be installed and from which a chimney flue leads
3.27
flue by-pass device
device which in the open position allows flue gases to pass directly to the flue spigot/socket
NOTE This can be used as a preheating aid to overcome chimney condensation.
3.28
flue damper
mechanism to change the flow of the combustion gases
3.29
flue draught
differential between the static pressure in the place of installation and the static pressure at the flue
gas measurement point
3.30
flue gases
gaseous compounds leaving the appliance flue spigot or socket and entering the flue gas connector
3.31
flue gas connector
duct through which flue gases are conveyed from the flue spigot of the appliance into the chimney flue
3.32
flue gas mass flow
mass of flue gas drawn off from the appliance per unit of time
3.33
flue gas temperature
temperature of the flue gas at the specified point in the measurement section
3.34
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
3.35
flueway
that part of an appliance designed to convey combustion gases from the firebox to the flue
spigot/socket
3.36
freestanding appliance
appliance designed to operate without needing to be built into a fireplace recess or fireplace
enclosure and which is not connected to the building except by the flue gas connector
3.37
front firebars
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
3.38
fuel hopper
fuel store integral with the appliance from which fuel is fed to the firebox
3.39
heat input
quantity of energy which the fuel provides to the appliance
3.40
heat output
quantity of useful heat released by the appliance
3.41
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
3.42
inset appliance
appliance with or without doors designed to be installed into a fireplace recess or an enclosure, or into
a firebox of an open fire
3.43
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
3.44
intermittent burning appliance
heating appliance designed for unrestricted burning at nominal heat output and which is not intended
for operating at reduced combustion for any specified period of time unless this is clearly stated by the
manufacturer
NOTE An appliance may be either a continuous burning appliance or an intermittent burning appliance
according to the fuel used.
3.45
maximum water operating pressure
limiting water pressure at which the boiler of an appliance can be safely operated
3.46
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
3.47
open fire
appliance which is built as an inset and designed to be connected to the building and surrounded by
non combustible materials
3.48
operating tool
device supplied with the appliance for handling movable and/or hot components
3.49
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.
3.50
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
3.51
recovery capability
ability of the fire to re-ignite existing or newly charged fuel after a defined burning period without external
assistance
3.52
reduced combustion capability
ability of an intermittent burning appliance to continue burning for a minimum period, dependent on
appliance type and fuel burned, without any input of fuel and without any external interference with
the combustion process, in such a manner that at the end of this period, the firebed can be recovered
3.53
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
3.54
residue
ashes, including combustibles, which collect in the ashpit
3.55
roomheater
appliance having a fully enclosed firebox with firedoor(s) which are normally closed, that distributes
heat by radiation and/or convection and also provides hot water when fitted with a boiler
3.56
safety heat exchanger
device which allows excess heat to be released from an appliance
3.57
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 basic firebed can be recovered at the end of this period
3.58
solid fuel
naturally occurring or manufactured solid mineral fuels, natural or manufactured wood logs and peat
briquettes
3.59
solid mineral fuel
coal, lignite, coke and fuels derived from these
3.60
space heating output
heat output provided by convection and radiation to the room
3.61
steady-state condition
stage at which values to be measured in successive equal periods of time do not exhibit significant
change
3.62
surround
outside components or assembly enclosing the appliance or parts of it
3.63
test fuel
fuel of commercial quality being characteristic of its type to be used for testing appliances
3.64
thermal discharge control
mechanical device controlled by the water flow temperature which opens a drain in the water circuit of
a safety heat exchanger when a specified flow temperature is attained
3.65
thermostat
temperature sensitive device which automatically changes the air inlet cross-sectional area
3.66
water heating output
heat output to water, averaged during the test period
3.67
working surfaces
all surfaces of an appliance designed to transmit heat to the surrounding atmosphere
NOTE All external surfaces of a roomheater including the flue gas connector in accordance with this
standard are classified as working surfaces because they are designed to transmit heat into the room in which
they are installed.
4 Materials, design and construction
4.1 Production documentation
The type of appliance in accordance with Table 1 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, related documents and/or scaled assembly drawings shall be available
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 refuelling intervals for these fuels.
If the appliance is fitted with a boiler, then the following additional details shall also be specified:
 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 operating pressure, in bar;
 the type test pressure, in bar;
 the water heating output, in kW.
4.2 Construction
4.2.1 General construction
4.2.1.1 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 as specified in accordance with the test procedures of this standard and exposed to
the associated mechanical, chemical and thermal stresses, the appliance shall operate reliably and
safely such that during normal operation no combustion gas posing a hazard can escape into the
room in which the appliance is installed nor can embers fall out. Non-combustible materials shall be
used, except that it shall be permissible to use combustible materials for the following applications:
 components or accessories fitted outside the appliance;
 internal components of controls and safety equipment;
 operating handles;
 electrical equipment.
No part of the appliance shall comprise any material known to be harmful.
When fired with solid mineral fuels, the appliance shall have a bottomgrate and an ashpan.
Component parts, which require periodic replacement and/or removal shall be either so designed or
marked for identification to ensure correct fitting.
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.
NOTE 2 All operations which the user carries out, including loading and emptying of the appliance, adjusting
controls and de-ashing should be easy, safe and effective.
4.2.1.2 Durability
The durability aspects of the appliance shall be deemed to be satisfied if it is shown to meet
the constructional requirements specified in 4.2.2 to 4.2.13, the safety requirements specified
in Clause 5 and the performance requirements specified in Clause 6.
NOTE The long practice with these products shows that such an approach for dealing with durability is
sufficient.
4.2.2 Integral boiler
4.2.2.1 General
The boiler shell shall be constructed from cast iron and/or steel and shall be capable of operating at
the maximum operating pressure declared by the manufacturer. The integral boiler shall meet the
requirements of A.4.7.
The materials and dimensions for the integral boiler construction shall be in accordance with the
specifications given in Tables 2 to 7. If alternative materials are used, then written evidence of similar
performance is required.
Provision shall be made for parts, which form a seal, to be located securely by means of bolts,
gaskets or welding to prevent the leakage of air/water or combustion products. Adjacent surfaces
between metal components in the firebox or the flueways shall be gastight. Where a seal is made with
fire-cement, cement shall be well supported by adjacent metal surfaces.
4.2.2.2 Boilers constructed of steel
4.2.2.2.1 Welding and welding materials
The materials used shall be suitable for welding.
NOTE The materials listed in Table 3, are suitable and do not require any additional heat treatment after
welding.
4.2.2.2.2 Nominal minimum wall thicknesses (steel)
Boilers constructed of steel shall have the appropriate wall thicknesses set out in Table 2.

Table 2 — Steel - Nominal minimum wall thicknesses
Application Non- Stainless Non-alloy steels for
alloy and appliances burning wood
steels corrosion only and having maximum
resistant water operating pressures of
steels up to and including 2 bar
mm mm mm
Walls of both the boiler shell and the 5 2 3
combustion chamber which are in
contact with either burning fuel or
products of combustion and/or water
Walls of convection heating surfaces 4 2 3
outside combustion chamber (except
circular tubes)
Circular tubes used in convection part of 3,2 1,5 3,2
heat exchanger
Water cooled grate tubes 4 3 3
Surfaces not in contact with burning fuel 3 2 3
or products of combustion and/or water
NOTE 1 The nominal minimum wall thicknesses apply to pressure loaded sheets and tubes other
than immersion coils, safety heat exchangers.
NOTE 2 Thinner wall thicknesses are only permissible with proof of equivalent corrosion
resistance, heat resistance and strength.
NOTE 3 The nominal minimum wall thicknesses listed have been specified taking into
consideration:
- the maximum water operating pressure (4 bar),
- the material properties,
- the heat transfer location.
The tolerances on the nominal minimum wall thicknesses for non-alloyed steels given in Table 2 shall
be as specified in EN 10029:1991.

Table 3 — Steel material types
1)
References Material type Material numbers
EN 10111:1998 DD 11 1.0332
DD12 1.0398
DD13 1.0335
DD14 1.0389
EN 10025:2004 S235JR 1.0037
S235JRG2 1.0038
S235J0 1.0114
S235J2G3 1.0116
S275JR 1.0044
S275J0 1.0143
S275J2G3 1.0144
S355JR 1.0045
S355J0 1.0553
S355J2G3 1.0570
S355K2G3 1.0595
EN 10028-2:2004 P195TR1 1.0107
P235GH 1.0345
P285QH 1.0478
P265GH 1.0425
P355NL1 1.0566
P295GH 1.0481
P355QH1 1.0571
P355GH 1.0473
16Mo3 1.5415
15NiCuMoNb5 1.6368
13CrMo4-5 1.7335
10CrMo9-10 1.7380
11CrMo9-10 1.7383
EN 10120:2008 P245NB 1.0111
P265NB 1.0423
P310NB 1.0437
P355NB 1.0557
EN 10088-2:2006 X5CrNi18-10 1.4301
X5CrNi17-12-2 1.4401
X2CrNiM017-13-2 1.4404
X6CrNiTi18-10 1.4541
X6CrNiNb18-10 1.4550
X2 CrMnNiN 22-5-2 1.4162
X2 CrNiN 23-4 1.4362
X2 CrNiMoN 22-5-3 1.4462
X1 NiCrMoCuN 25-20-7 1.4529
X1 NiCrMoCu 25-20-5 1.4539
X6CrNiMoTi17-12-2 1.4571
X6CrNiMoNb17-12-2 1.4580
X3CrNiMo17-3-3 1.4436
1) In accordance with EN 10027-2:1992.
NOTE Materials and wall thicknesses other than those specified may only be used on production of appropriate
evidence as regards at least their equivalent corrosion resistance, heat resistance and strength to non-alloy steel
at the material thicknesses specified in 4.2.2.2.2 for the particular application/usage.

4.2.2.3 Boilers constructed of cast iron
4.2.2.3.1 Cast iron parts subject to water pressure
The mechanical properties of cast iron used for parts subject to water pressure shall, as a minimum,
correspond to the values listed in Table 4.
Table 4 — Minimum mechanical requirements for cast irons
1)
Grey cast iron
- Tensile strength R
> 150 N/mm
m
- Brinell hardness 160 HB to 220 HB
2)
Spheroidal graphite iron
- Tensile strength R > 400 N/mm
m
- Elongation 18 % A
1) In accordance with EN 1561:1997.
2) In accordance with EN 1563:1997.

4.2.2.3.2 Minimum wall thicknesses (cast iron)
The wall thickness of the casting section shall be not less than the minimum thicknesses listed in
Table 5.
Table 5 — Cast iron - Minimum wall thicknesses
Nominal heat output Grey cast iron Spheroidal graphite
cast iron
kW mm mm
3,5 3,0
< 30
4,0 3,5
≥ 30 and < 50
4.2.2.4 Boiler shell tappings
The threads of boiler shell tappings, for flow and return pipes, shall be not less than the minimum
thread size designation given in Table 6.
Where tapered threads are used, they shall be in accordance with the requirements of ISO 7-1:1994
and ISO 7-2:2000. Where parallel threads are used, they shall be in accordance with ISO 228-1:2000
and ISO 228-2:1987. The design and position of flow tappings shall be such that air is not retained
within the boiler shell.
Table 6 — Minimum thread size designation of flow and return tappings
Nominal heat output Gravity circulation Pumped circulation
thread size thread size
1) 1)
designation designation
kW
1 ½
≤ 22
> 22 ≤ 35 1¼ 1
> 35 < 50 1½ 1
1)
Designation in accordance with ISO 7-1:1994 and ISO 7-2:2000 or
ISO 228-1:2000 and ISO 228-2:1987.

If boilers are supplied with reducing bushes in horizontal flow tappings, these shall be eccentric and
fixed so that the reduced outlet is uppermost. The minimum depth of tapping or length of thread shall
conform to Table 7.
Table 7 — Minimum depth of tapping or length of thread
1)
Thread size designation Minimum depth or length of
thread
mm
½ to 1¼ 16
1½ 19
1)
Designation in accordance with ISO 7-1:1994 and ISO 7-
2:2000 or ISO 228-1:2000 and ISO 228-2:1987.

Where a drain socket is provided in the boiler shell, it shall be a minimum thread size designation of ½
and shall be in accordance with ISO 7-1:1994 and ISO 7-2:2000 or ISO 228-1:2000 and ISO 228-
2:1987.
4.2.2.5 Boiler waterways
4.2.2.5.1 Design of all boiler waterways
The design of the boiler shall ensure a free flow of water through all parts. To minimize the build up of
sediments, sharp or wedge-shaped waterways with a taper towards the bottom shall be avoided.
Where inspection holes are provided in the boiler to give access for inspection and cleaning of the
waterways, they shall be a minimum of (70 × 40) mm or have a minimum diameter of 70 mm and be
sealed with a gasket and cap.
4.2.2.5.2 Boiler waterways used with indirect water systems
The minimum internal dimension of waterways throughout the main body of the appliance shall be not
less than 20 mm except where waterways have to be locally reduced to facilitate manufacture or are
in areas not in direct contact with burning fuel. In these cases the width of the waterways shall not be
less than 15 mm.
4.2.2.5.3 Boiler waterways used with direct water systems
The minimum internal dimensions of waterways in boilers designed for direct water systems shall be
not less than 25 mm.
4.2.2.5.4 Venting of the water sections
The boiler and its components shall be designed in such a way that their respective water sections
can be vented.
The boiler shall be so designed that under normal operation in accordance with the manufacturer's
installation instructions, no undue boiling noises occur.
4.2.2.5.5 Water tightness
Holes, for screws and similar components, which are used for the attachment or removal of parts,
shall not open into waterways or spaces through which water flows.
NOTE This does not apply to pockets for measuring, control and safety equipment.
4.2.3 Cleaning of heating surfaces
All heating surfaces shall be accessible from the flue gas side for inspection and cleaning with
brushes, scrapers or chemical agents by means of sufficient cleaning openings. Where cleaning and
servicing of the boiler and its components require the use of special tools (e.g. special brushes), these
shall be supplied by the appliance manufacturer.
4.2.4 Flue spigot or socket
For horizontal flue connection, the flue spigot/socket shall be designed to allow fitting, internal or
external, over a length of at least 40 mm, of a flue gas connector.
For vertical flue connection, the fitting shall overlap by at least 25 mm.
The flue spigot or socket is a fixed and indispensable part of the appliance as tested and sold and
shall not be extended for type test purposes. It is not part of the test rig and shall not be confused with
the un-insulated flue gas connector (see A.2.1). However if an extended flue spigot, socket or fluepipe
is part of the appliance design it shall be included for the type test provided that it is supplied as part
of the appliance for fitting whenever the appliance is marketed.
NOTE For inset appliances (made for fireplace recesses) with a vertical chimney flue connection and where
the manufacturer`s installation instructions specify, in addition to the flue gas connector, that an insulating mortar
infill should be added around the connector to seal the appliance to the chimney flue, then in this case it is
permissible for the flue spigot/socket overlap to be reduced to a minimum of 6 mm.
4.2.5 Flueways
The size of the flueway in its minimum dimension shall be not less than 30 mm except it shall be
permissible to reduce it to not less than 15 mm for appliances designed only to burn fuels other than
bituminous coals and peat briquettes, and where an access door(s) is provided for cleaning the
flueway. It shall be possible to clean the flueways of the appliance completely using commercially
available tools or brushes, unless special tools or brushes are provided by the appliance manufacturer.
4.2.6 Ashpan and ash removal
A means for the removal of the ash residue from the appliance shall be provided. When an ashpan is
provided, it shall be capable of containing the combustion residue from two full charges of fuel whilst
retaining sufficient space above to allow adequate primary air flow through the bottomgrate or firebed.
If the ashpan resides in the appliance it shall locate in the ashpit in such a way that it allows the free
passage of primary air and in such a position that it does not obstruct any primary air inlet control.
NOTE 1: The ashpan should be designed and constructed to ensure that:
a) it effectively collects the residue from beneath the bottomgrate;
b) it can be easily and safely withdrawn, carried and emptied when hot, using the tool(s) provided,
without undue spillage of residue material.
NOTE 2: The ashpan can be shovel shaped.
4.2.7 Bottomgrate
Where the bottomgrate is removable it shall be so designed or marked as to ensure correct fitting. If a
de-ashing mechanism is fitted it shall be capable of effectively de-ashing the fuelbed.
NOTE 1 The preferred design with the firedoor(s) and ashpit door(s) closed should allow de-ashing to be
carried out. The de-ashing should be possible without undue effort.
NOTE 2 If it is necessary to remove the ashpit door to de-ash the fire, the appliance should be designed to
minimise ash or fuel spillage during the de-ashing operation.
4.2.8 Combustion air supply
4.2.8.1 Primary air inlet control
The appliance shall be fitted with either a thermostatically controlled primary air inlet control or a
manual primary air inlet control. For appliances with a boiler, a manual primary air inlet control shall
only be allowed for boiler outputs up to 7,5 kW. The adjusting control shall be clearly visible or shall
be permanently marked so that its operation is readily understandable.
The design shall be such that during operation of the appliance, neither ash nor unburned fuel can
prevent the movement or closure of the air inlet control.
The ‘cold’ setting of the air inlet control shall be clearly marked and the method of adjustment shall be
described in the user instructions.
The thermostat shall have a variable temperature range and be of the immersion or dry pocket type.
The pocket shall be positioned so that the thermostat senses the temperature of the flow water from
the appliance.
4.2.8.2 Secondary air inlet control
Where a secondary air inlet control is provided, the position of air entry shall be so designed that the
passage of air is not restricted when the firebox is filled to the manufacturer's recommended capacity.
4.2.9 Control of flue gas
If a flue damper is fitted it shall be of a type, which does not block the flue totally. The damper shall be
easy to operate and incorporate an aperture within the blade, which in a continuous area occupies at
least 20 cm or 3 % of the cross-sectional area of the blade, whichever is greater.
The position of the damper shall be recognizable from the setting of the device.
If a draught regulator is fitted the minimum cross sectional area requirement shall not be applicable
but the device shall be easily accessible for cleaning.
4.2.10 Firedoors and charging doors
When the appliance is equipped with a charging door, that door shall be large enough to allow the
appliance to be filled with the commercial fuels recommended by the manufacturer. Firedoors and
charging doors shall be designed to prevent accidental opening and to facilitate positive closure.
4.2.11 Flue bypass device
Any flue bypass device shall be easily operable. The extreme positions corresponding to full opening
and closing shall be stable and easily identifiable.
4.2.12 Front firebars and/or deepening plate
Front firebars shall be designed to retain the fuel or ash such that there is no undue spillage of ash or
burning fuel from the roomheater during normal operations, particularly during refuelling or de-ashing.
If the appliance is fitted with removable front firebars and/or deepening plate, they shall be of a design
such that they can neither be incorrectly fitted nor accidentally dislodged.
4.2.13 Solid mineral fuel and peat briquettes burning appliances
When the recommended fuels are solid mineral fuel and peat briquettes, the appliances shall have a
bottomgrate and an ashpan.
5 Safety requirements
5.1 Natural draught
Where the appliance manufacturer claims that a continuous burning appliance can be connected to a
chimney serving more than one appliance, and can be operated with solid mineral fuel and peat
briquettes as suitable fuels, then when tested in accordance with A.4.9.3 either the flue draught
throughout the test period shall be not less than 3 Pa or where the flue draught falls below 3 Pa then
over a further 10 h period from when the draught falls below 3 Pa the total quantity of carbon
monoxide in the flue gas, calculated to NTP as detailed in A.6.2.8 shall not be greater than 250 dm³.
Such an appliance shall be clearly labelled to indicate whether or not it can be installed into a shared
flue (see 7.2).
5.2 Operation with open firedoors
The
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