England · Statutory guidance
Conservation of fuel and power: Approved Document L, Volume 1 — Dwellings
Building regulation guidance on energy efficiency and the conservation of fuel and power.
- Edition
- 2021 edition incorporating 2023 amendments · Volume 1; later editions and transitions on source page
- Search coverage
- 104 of 104 PDF pages · 3 OCR pages
Energy & sustainability
Open original PDF at page 95 Source wording and page order preserved. Drawings and table layouts remain available in the original PDF.
O N L I N E V E R S I O N
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Table D1 Continued
Hot water system Stored hot water in cylinder, heated by air source heat pump
with back-up immersion heating
Separate time control for space and water heating
Wastewater heat recovery (WWHR) None
Hot water cylinder If cylinder, declared loss factor = 0.85 ´ (0.2 + 0.051 V2/3) kWh/day
where V is the volume of the cylinder in litres
Lighting Fixed lighting capacity (lm) = 185 ´ total floor area
Efficacy of all fixed lighting = 80 lm/W
Air conditioning None
Photovoltaic (PV) system None
NOTES:
1. Changes from the notional dwelling specification (Table 1.1) are in bold.
2. See SAP 10 for details.
3. Space heating and water heating efficiencies as calculated in SAP 10; this is different from the COP.
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O N L I N E V E R S I O N
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