England · Statutory guidance
Conservation of fuel and power: Approved Document L, Volume 2 — Buildings other than dwellings
Energy performance guidance for non-domestic buildings, covering fabric, services, controls and commissioning.
- Edition
- 2021 edition incorporating 2023 amendments · Volume 2; later editions and transitions on source page
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Energy & sustainability
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L1(a) O N L I N E V E R S I O N
Table 4.7 M aximum heat losses from domestic hot water storage vessels(1)(2)
Nominal volume (litres) Heat loss (kWh/24h) Nominal volume (litres) Heat loss (kWh/24h)
200 2.1 900 4.5
300 2.6 1000 4.7
400 3.1 1100 4.8
500 3.5 1200 4.9
600 3.8 1300 5.0
700 4.1 1500 5.1
800 4.3 2000 5.2
NOTES:
1. For maximum heat losses from vessels with a storage volume less than 200 litres, see BS EN 15450.
2. The heat loss from electrically-heated cylinders (volume V litres) should not exceed either of the following.
a. Point-of-use: 1.28 × (0.2 + 0.051V2/3).
b. Local: 1.28 × (0.051V2/3).
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Approved Document L Volume 2, 2021 edition Building Regulations 2010
O N L I N E V E R S I O N
Edition and local adoption determine which requirements apply. Use the publisher’s document for the complete clauses, diagrams and amendments.