BS 8303:2018
$215.11
Installation of domestic heating and cooking appliances burning wood and solid mineral fuels. Specification
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 98 |
This British Standard specifies requirements for the design and installation of the following types of domestic heating and cooking appliances, rated up to 50 kW, burning wood, woody biomass and solid fuels in both new and existing buildings (see Clause 6):
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open fires;
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room heaters;
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free-standing cookers; and
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independent boilers.
The standard also specifies the procedures to be followed for on-site testing of the installations.
NOTE Where manufacturers’ installation instructions are more onerous and give a higher level of safety, these take precedence over the requirements of this British Standard.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | Foreword |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions |
| 11 | 4 Information and requirements to be agreed and documented 4.1 Information to be obtained by the installer 4.2 Checks before commencing work |
| 12 | 4.3 Items for agreement 4.4 Appliance technical specifications and installation instructions 5 Appliance classification |
| 13 | 6 General 6.1 Mechanical resistance and stability |
| 14 | Figure 1 — Typical flue pipe entry to existing masonry chimney 6.2 Safety in case of fire |
| 15 | 6.3 Air supply and connection to chimney Table 1 — Air supply to solid fuel appliances |
| 18 | 6.4 Safety in use |
| 19 | Table 2 — Minimum flue size 6.5 Protection against noise |
| 20 | 6.6 Energy economy and heat retention 7 Checking, handling and site storage of materials and components 7.1 Checking |
| 21 | 7.2 Handling on site 7.3 Site storage 8 Coordination of work and installation preparation |
| 22 | 9 Fireplace recess |
| 23 | Figure 2 — Dimensions of a masonry-built fireplace recess |
| 24 | Figure 3 — Construction of a fireplace recess (traditional brick construction) 10 Hearths 10.1 General |
| 25 | 10.2 Constructional hearth Figure 4 — Dimensions of a constructional hearth |
| 26 | Figure 5 — Distance of an appliance from combustible material |
| 27 | Figure 6 — Clearance between appliance and adjacent walls Table 3 — Clearance between appliance and adjacent walls |
| 29 | Figure 7 — Example of parallel installation with shielding of combustible wall |
| 30 | Figure 8 — Example of angled installation with shielding of combustible wall (plan view) 10.3 Superimposed hearth |
| 31 | Figure 9 — Positioning of appliance on a hearth (plan views) |
| 32 | 10.4 Hearth for appliance placed or built into a raised fireplace recess |
| 34 | Figure 10 — Hearth for appliance placed or built into a raised fireplace recess |
| 35 | Table 4 — Dimensions for superimposed hearth below appliance on raised hearth 11 Connecting flue pipes 11.1 General Figure 11 — Pipe or adaptor to flue 11.2 Size |
| 36 | 11.3 Material 11.4 Installation |
| 37 | Figure 12 — Vertical exit connection |
| 38 | Figure 13 — Horizontal exit connection 11.5 Cleaning 11.6 Separation from combustible material |
| 39 | Figure 14 — Separation from combustible material 11.7 Joints 12 Chimney and flue pipe cleaning 12.1 General |
| 40 | 12.2 Soot door Figure 15 — Typical installation of a free-standing cooker or independent boiler in a recess with a raft lintel |
| 41 | Figure 16 — Typical installation of a free-standing cooker or independent boiler in an existing recess with metal register plate 12.3 Sweeping access in connecting flue pipe 12.4 Separation from combustible material |
| 42 | Figure 17 — Typical free-standing rear outlet room heater fitted in a recess |
| 43 | Figure 18 — Typical connection of a vertical outlet free-standing cooker or independent boiler to a chimney 13 Methods of closure at the top of a fireplace recess 13.1 Types and applications 13.2 Materials for closures at the top of a fireplace recess |
| 45 | Figure 19 — Flue pipe connection to raft lintel 13.3 Installation of closures at the top of a fireplace recess |
| 47 | Figure 20 — Securing of connecting flue pipe into register plate using clamping ring |
| 48 | Figure 21 — Securing of connecting flue pipe into register plate using funnel adaptor |
| 49 | 14 Fireback 14.1 General 14.2 Dimensions 14.3 Infill |
| 50 | Figure 22 — Typical setting for inset open fire without a boiler |
| 51 | Figure 23 — Typical installation of inset open fire with a boiler unit |
| 52 | Figure 24 — Typical installation of a sunken ash pit inset open fire with underfloor air supply |
| 53 | Figure 25 — Typical setting for inset open fire with convection, without boiler, installed into a BS 1251 fireback |
| 54 | Table 5 — Composition proportion for in-fill 15 Fireplace surround 15.1 General 15.2 Mechanical fixing arrangements for fireplace surrounds Figure 26 — Typical fixing brackets for cut stone surrounds |
| 56 | Figure 27 — Typical fixing locations for cut stone surrounds 16 Throat |
| 57 | 17 Boiler 18 Electrical supply 19 Open fires without convection 19.1 General 19.2 Inset open fire without boiler (see Figure 22) 19.3 Inset open fire with boiler (see Figure 23) 19.4 Inset open fire with underfloor air supply (see Figure 24) |
| 58 | Figure 28 — Provision of permanent air vent openings in a solid floor |
| 59 | 19.5 Inset open fire with fan-assisted air supply 20 Open fires with convection 20.1 General 20.2 Free-standing open fires |
| 60 | Figure 29 — Construction of a fireplace recess (with a raft lintel) |
| 61 | Figure 30 — Construction of a fireplace recess with corbelled gather applicable to a typical installation of inset open fires and room heaters |
| 62 | Figure 31 — Typical open fire with convection fitted in a fireplace recess 20.3 Inset open fire with convection, with or without boiler |
| 63 | Figure 32 — Inset convector open fire |
| 64 | Figure 33 — Typical fitting of an open fire with convection to a back register plate Figure 34 — Typical fitting and sealing of a free-standing room heater to a back register plate |
| 65 | 21 Room heaters 21.1 General 21.2 Free-standing appliance in a fireplace recess |
| 66 | Figure 35 — Typical free-standing room heater fitted in a recess 21.3 Inset appliance in a fireplace recess |
| 67 | Figure 36 — Typical fitting of a closed inset appliance to a masonry/clay lined chimney |
| 68 | Figure 37 — Typical fitting of a closed inset appliance to a flexible stainless steel relined chimney |
| 69 | 21.4 Inset (with or without boiler) installed in a free‑inset fireplace surround |
| 70 | Figure 38 — Typical free inset application of room heater installation 22 Independent boilers and free-standing cookers 22.1 General |
| 71 | 22.2 Appliance installed against a wall 22.3 Appliance installed in a fireplace recess 23 Making good |
| 72 | 24 Carbon monoxide alarm 25 Commissioning of the installation 25.1 Inspection |
| 73 | 25.2 Testing 26 Handover |
| 74 | Annex A (informative) Checklist for specifying purchaser’s requirements Figure A.1 — Checklist for specifying purchaser’s requirements |
| 78 | Annex B (informative) Selection of appliances Annex C (informative) Assessing air permeability |
| 79 | Annex D (normative) Methods of checking flues and installations |
| 86 | Annex E (informative) Specifications of tested external air supply appliances |
| 87 | Annex F (informative) Risk assessment of external air supply appliances |
| 89 | Annex G (informative) Commissioning checklist Table G.1 — Commissioning checklist: General |
| 90 | Table G.2 — Commissioning checklist: Chimney details |
| 92 | Table G.3 — Commissioning checklist: Hearth details Table G.4 — Commissioning checklist: Appliance details |
| 93 | Table G.5 — Commissioning checklist: Ventilation details |
| 94 | Table G.6 — Commissioning checklist: Fuel storage details Table G.7 — Commissioning checklist: Provision for maintenance |
| 95 | Table G.8 — Commissioning checklist: Smoke tests |
| 96 | Bibliography |
