Conservation of fuel and power: Approved Document L, Volume 2 — Buildings other than dwellings

O N L I N E V E R S I O N L1(b), L2 b. BS EN 13842. The calculation of the thermal efficiency (net calorific value) should both: a. exclude fans b. take account of the radiant heater and associated flue pipe/tailpipe within the building envelope. Table 6.4 M inimum performance standards for radiant heaters Appliance type Heat generator efficiency (net calorific value) Thermal Radiant Luminous radiant heater – unflued 86% 55% Non-luminous radiant heater – unflued 86% 55% Non-luminous radiant heater – flued 86% 55% Multi-burner radiant heater 91% n/a Electric space heating systems NOTE: Electric resistance heating is assumed to be 100% efficient, therefore no minimum efficiency is set for these types of system. NOTE: This section of the guidance does not cover either of the following. a. Electric heat pumps (guidance is provided in paragraphs 6.44 to 6.46). b. Portable electric heating devices. 6.13 Electric space heating systems should meet the guidance in paragraphs 6.14 to 6.19, in addition to the general requirements for heating systems in Section 5. 6.14 Electric boiler systems should comply with all of the following. a. Systems should both: i. have flow temperature control ii. be capable of modulating the power input to the primary water depending on space heating conditions. b. Timing and temperature demand control should be provided. c. If the building has a floor area greater than 150m2, heating should be split into different heating zones and each zone should have separate controls for timing and temperature demand. 6.15 Electric warm air systems should comply with both of the following. a. Have timing and temperature demand control provided. b. If the building has a floor area greater than 150m2, heating should be split into different heating zones and each zone should have separate controls for timing and temperature demand. 6.16 Electric radiant heaters should have automatic zone or occupancy control through presence detection. 6.17 Electric panel or skirting heaters should have controls for timing and temperature demand. 6.18 The input charge for electric storage heaters should be adjusted automatically, based on the internal air temperature. Manual control of heat release from the appliance should be possible. 43 Building Regulations 2010 Approved Document L Volume 2, 2021 edition O N L I N E V E R S I O N