Conservation of fuel and power: Approved Document L, Volume 1 — Dwellings

O N L I N E V E R S I O N L1(b), L2 Table 6.4 Solid fuel appliance categories and minimum efficiencies Category(1) Appliance description Minimum efficiency Feed type (gross calorific value) D1/2/3/4 Open fire and high output boiler 63% Batch E1/2/3 Dry room heater – wood or multi- 65% Batch/auto fuel E4 Dry room heater – pellet stove 65% part load Auto 70% nominal load F Room heater with boiler 67% (mineral fuels and wood logs) Batch/auto 70% (wood pellets – part load) 75% (wood pellets – nominal load) G1 Cooker without boiler not exceeding 55% (wood fuels) Batch 3.5kW G2 Cooker with heating boiler exceeding 60% (wood fuels) Batch 3.5kW J2 Independent boiler – wood logs only 75% Batch J5 Independent boiler – wood/pellets/ 75% nominal load Auto chips 70% part load NOTE: 1. These categories are set out in HETAS’s The HETAS Guide to Approved Solid Fuel, Wood and Biomass Products and Services. District heat networks and community heating systems 6.18 Paragraphs 6.19 to 6.25 apply when connecting dwellings to a district heat network or community heating system to which both of the following apply. a. Has a central heat source, such as a boiler, combined heat and power unit or heat pumps. b. Distributes heat to 15 or more dwellings. NOTE: An existing district heat network is defined in Appendix A. A new district heat network should be taken as meaning any other district heat network. Connecting to a new district heat network or community heating system 6.19 The central heat source should comply with the standards in Section 6 of Approved Document L, Volume 2: Buildings other than dwellings. Connecting to an existing district heat network or community heating system New dwellings 6.20 An existing district heat network that is being connected to a new dwelling should not have a CO emission factor for delivered heat to the dwelling which is greater than 0.350kgCO /kWh. 2 2 The CO emission factor should be calculated using SAP 10 or taken from the Product 2 Characteristics Database NOTE: The same CO emission factors used to calculate the dwelling emission rate described 2 in paragraph 2.9 of this approved document should be used to check against the minimum performance standards described in paragraph 6.20. 44 Approved Document L Volume 1, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N