BS EN 303-5:2021:2022 Edition

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Heating boilers – Heating boilers for solid fuels, manually and automatically stoked, nominal heat output of up to 500 kW. Terminology, requirements, testing and marking

Published By	Publication Date	Number of Pages
BSI	2022	114

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Categories: 01.040.91 - Construction materials and building (Vocabularies), BSI

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Description

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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PDF Pages	PDF Title
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16	1 Scope 1.1 General
17	1.2 Fuels
18	2 Normative references
21	3 Terms and definitions
28	4 Requirements 4.1 General requirements 4.1.1 General requirements for all boilers
29	4.1.2 General requirements for condensing boilers 4.1.2.1 Materials in contact with condensate 4.1.2.2 Condensate drainage
30	4.1.2.3 Chemical composition of condensate 4.2 Construction requirements 4.2.1 Production documentation 4.2.1.1 Drawings 4.2.1.2 Manufacturing controls
31	4.2.2 Heating boilers (parts) made of steel 4.2.2.1 Execution of welding work 4.2.2.2 Welding seams and welding fillers 4.2.2.3 Parts of steel subject to pressure
36	4.2.2.4 Minimum wall thicknesses
37	4.2.3 Boilers made of cast materials 4.2.3.1 General 4.2.3.2 Cast iron parts subject to pressure
38	4.2.3.3 Minimum wall thicknesses 4.2.4 Design requirements 4.2.4.1 Venting of the water sections
39	4.2.4.2 Cleaning of heating surfaces 4.2.4.3 lnspection of the flame 4.2.4.4 Water tightness 4.2.4.5 Replacement parts 4.2.4.6 Boiler shell tappings 4.2.4.7 Immersion pockets for control and indicating equipment, and safety temperature limiter
40	4.2.4.8 Thermal insulation 4.2.4.9 Water side resistance of the boiler 4.2.4.10 Integral fuel hopper 4.2.4.11 Fuel chamber
41	4.2.4.12 Ash chamber 4.2.5 Requirements for boilers with outside combustion air supply and room sealed appliances 4.2.5.1 Design requirements for boilers for outside combustion air supply 4.2.5.2 Leakage of the boiler
42	4.3 Safety requirements 4.3.1 General
43	4.3.2 Manual stoked boilers 4.3.3 Safety against back burning for automatic stoked boilers 4.3.3.1 General 4.3.3.2 Thermal conductance
44	4.3.3.3 Back flow of ignitable combustion gases into the fuel line or integral hoppers
45	4.3.3.4 Fire propagation into the fuel line or integral hopper
46	4.3.3.5 Alternative verification of safety against back burning 4.3.4 Prevention of the transmission of toxic components
47	4.3.5 Safety against fuel overload of the boiler or interruption in fuel supply 4.3.6 Safety against lack of air supply or insufficient combustion
48	4.3.7 Surface temperatures 4.3.8 Leakage of the boilers category 1 4.3.9 Temperature control and limiting devices 4.3.9.1 General 4.3.9.2 Temperature control and limiting devices for open vented systems
49	4.3.9.3 Temperature control and limiting devices for closed vented system 4.3.9.4 Devices for dissipating excess heat
50	4.3.10 Assessment of additional risk 4.3.11 Additional safety requirements for condensing boilers
51	4.3.12 Additional safety requirements for outside air supply boilers and room sealed appliances 4.3.12.1 Negative pressure in the combustion chamber for boilers category 2 4.3.12.2 Requirements regarding a possible recirculation of flue gas 4.3.13 Heating boiler accessories 4.3.13.1 General 4.3.13.2 Electrical safety 4.3.13.3 Electromagnetic compatibility
52	4.4 Performance requirements 4.4.1 General 4.4.2 Energy efficiency 4.4.2.1 General 4.4.2.2 Boiler efficiency
54	4.4.2.3 Useful efficiency 4.4.2.4 Seasonal space heating energy efficiency 4.4.2.5 Energy efficiency index 4.4.3 Flue gas temperature 4.4.4 Draught 4.4.5 Combustion period
55	4.4.6 Minimum heat output 4.4.6.1 General 4.4.6.2 Requirements for accumulator tanks 4.4.7 Emission limits 4.4.7.1 Emission limits at nominal heat output and minimum heat output
56	4.4.7.2 Seasonal Space Heating Emissions limits
57	5 Test 5.1 Test conditions 5.1.1 General 5.1.2 Choice of boiler and fittings to be tested
58	5.1.3 Condition of the boiler 5.1.4 Type test 5.2 Measuring instruments and methods
59	5.3 Test fuel
62	5.4 Pressure test for boilers of sheet or sheet metal of non-ferrous metal 5.4.1 Tests to be carried out before production 5.4.2 Test during production
63	5.5 Pressure test for boilers of cast iron or non-ferrous metals 5.5.1 Test to be carried out before production 5.5.1.1 Burst test on individual sections 5.5.1.2 Water pressure tests on boiler block 5.5.2 Test during production 5.5.2.1 Cast sections
64	5.5.2.2 Boiler block 5.6 Conducting the boiler performance test 5.6.1 General 5.6.2 Setting up the test rig
65	5.6.3 Measured quantities
66	5.6.4 Test method and test duration 5.6.4.1 Heating boilers with manual stoking 5.6.4.2 Heating boilers with automatic stoking 5.7 Determination of the heat output and the efficiency of the boiler 5.7.1 Method for the measurement of the heat output 5.7.1.1 General
67	5.7.1.2 Determination of heat output in the boiler circuit 5.7.1.3 Determination of heat output by means of a heat exchanger 5.7.2 Determining the nominal heat output 5.7.3 Determining the minimum heat output
68	5.7.4 Verification of nominal heat output with condensation 5.7.5 Verification of the minimum continuous heat output with condensation 5.7.6 Determination of the boiler efficiency (direct method) 5.7.7 Electrical consumption
69	5.8 Determination of the emission values 5.8.1 Heating boiler with manual stoking 5.8.2 Heating boiler with automatic stoking 5.9 Calculation 5.9.1 Boiler heat output 5.9.2 The heat input 5.9.3 Boiler efficiency 5.9.3.1 General 5.9.3.2 Direct method
70	5.9.3.3 Indirect method 5.9.3.4 Calculation of useful efficiency
71	5.9.3.5 Calculation of seasonal space heating energy efficiency 5.9.3.6 Calculation of Energy Efficiency Index (EEI) 5.9.4 Emissions 5.9.4.1 Emissions at nominal heat output and minimum continuous heat output
72	5.9.4.2 Emissions at minimum heat output at intermittent operation 5.9.4.3 Calculation of NOx Emissions based on reference test fuel Nitrogen content 5.9.4.4 Seasonal space heating emissions 5.10 Determination of the waterside resistance 5.11 Surface temperature
73	5.12 Verification of condensate 5.13 Function check of the temperature controller and safety temperature limiter at the boiler 5.14 Function test for the rapidly disconnectable firing system
74	5.15 Function test on the device for dissipating excess heat (partly or non-disconnectable firing system) 5.16 Selected tests to demonstrate functional safety 5.16.1 General
75	5.16.2 Safety test of consequences of fuel overload and effect of a blockage of the fuel supply 5.16.3 Loss of combustion air supply 5.16.4 Resistance to thermal conductance
76	5.16.5 Additional tests for alternative verification of the safety against back burning 5.16.6 Test for gas side leakage
77	5.17 Check of safety for condensing operation 5.18 Additional checks of the safety for boilers with outside combustion air supply 5.18.1 Test of leakage rates 5.18.2 Temperature at combustion air connector 5.18.3 Functional safety and design limits caused by recirculation of flue gas into the combustion air supply 6 Test report and other documents
78	7 Marking 7.1 General
79	7.2 Information on the boiler plate 7.3 Boiler plate requirements 8 Technical documentation, supplied with boiler 8.1 General 8.2 Technical information and installation instructions
82	8.3 Operating instructions
83	Annex A (informative)Manual measurement of particles in the gas flow, gravimetric determination of particle load with filter systems
86	Annex B (normative)Design criteria for solutions to prevent back burning
92	Annex C (informative)Installation of boilers with combustion air supply from outside the building
94	Annex D (informative)Recommended limits for substances of content of the condensate
95	Annex E (informative)Recommended analytical methods
96	Annex F (informative)Calculation methods F.1 Calculation of seasonal space heating energy efficiency
98	F.2 Calculation of Energy Efficiency Index (EEI) F.3 Seasonal space heating emissions
100	Annex G (normative)Calculation methods for recirculation influence
101	Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive2006/42/EC aimed to be covered
103	Annex ZB (informative)Relationship between this European Standard and the ecodesign requirements of Commission Regulation (EU) [2015/1189] [L 193] aimed to be covered
104	Annex ZC (informative)Relationship between this European Standard and the energy labelling requirements of Commission Delegated Regulation (EU) [2015/1187] [L 193] aimed to be covered
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Additional information

Status	Withdrawn
Title	Heating boilers – Heating boilers for solid fuels, manually and automatically stoked, nominal heat output of up to 500 kW. Terminology, requirements, testing and marking
Replaces	BS EN 303-5:2012
Publisher	BSI
Committee	RHE/24
Pages	114
Publication Date	2022-01-10
Withdrawn Date	2023-11-08
ISBN	978 0 580 95108 4
Standard Number	BS EN 303-5:2021
Identical National Standard Of	EN 303-5
Descriptors	Thickness, Burst tests, Draughts, Terminology, Drawings, Designations, Wood, Safety measures, Pressure testing, Emission, Testing conditions, Sampling equipment, Temperature, Solid-fuelled devices, Iron, Combustion, Marking, Performance, Heating equipment, Efficiency, Welded joints, Hot-water boilers, Welding, Production, Steels, Fossil fuels, Boilers, Thermal output, Filters
ICS Codes	01.040.91 - Construction materials and building (Vocabularies)

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