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 Section 4: Limiting heat gains and losses 23 U-values 23 Limiting standards for new or replacement elements 24 Limiting standards for renovated and retained elements 26 Continuity of insulation 27 Airtightness in existing buildings 28 Limiting the effects of solar gains in summer 29 Limiting heat losses and gains from building services 29 Requirements L1(b)(i), (ii) and L2: Fixed building services energy efficiency and controls and on-site generation of electricity 33 Intention 34 Section 5: Minimum building services efficiencies and controls – general guidance 35 New building services 35 Replacement building services in existing buildings 35 Sizing new and replacement space heating systems 36 Controls and zoning for new and replacement space heating systems 37 System treatment for hot water systems for space and domestic hot water heating 37 Thermostatic room controls 37 Energy submeters 38 Section 6: System specific guidance 39 Boilers 39 Gas and oil-fired warm air heaters 42 Gas and oil-fired radiant heaters 42 Electric space heating systems 43 Combined heat and power 44 Dedicated domestic hot water heaters 44 Comfort cooling 47 Heating and cooling system circulators and water pumps 49 Heat pumps 49 Mechanical ventilation 50 Heat recovery 52 Lighting 52 Building automation and control systems 53 On-site electricity generation and storage 55 District heat networks and community heating 55 vi Approved Document L Volume 2, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N