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 Section 6: System specific guidance NOTE: This section sets out minimum Building Regulations standards for fixed building services and other systems. Best practice is to achieve higher efficiencies than these minimum standards. NOTE: The Ecodesign for Energy-Related Products Regulations 2010 set the efficiencies and standards that must be met when introducing new energy-using products to the market. This approved document sets standards that should be met when installing fixed building services or on-site electricity generation. In cases where the Energy-Related Products Regulations and the Building Regulations both apply, both standards should be met. Gas-fired heating systems 6.1 A gas-fired heating system should meet either of the following, in addition to the general requirements for heating and hot water systems in Section 5. a. New dwellings should meet the minimum efficiencies in Table 6.1. b. Existing dwellings should meet the minimum efficiencies in Table 6.2. NOTE: The minimum system efficiency in Table 6.1 might need to be improved upon to meet the target emission rate and target primary energy rate for the dwelling. Table 6.1 sets out minimum standards for services that are likely to be installed in new dwellings. If a service is not covered in Table 6.1 then it should meet either the efficiencies set out in Table 6.2 or an equivalent standard. Table 6.1 Minimum efficiencies for gas-fired heating systems in new dwellings System type Minimum efficiency Wet heating (e.g. radiators or underfloor heating) 92% (as defined in ErP(1)) NOTE: 1. Energy-Related Products Directive. For Standard Assessment Procedure modelling, SEDBUK values should be used. Building Regulations 2010 Approved Document L Volume 1, 2021 edition 39 O N L I N E V E R S I O N