# Commission Delegated Regulation (EU) No 811/2013 of 18 February 2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to the energy labelling of space heaters, combination heaters, packages of space heater, temperature control and solar device and packages of combination heater, temperature control and solar device (Text with EEA relevance), Division 3: ENERGY EFFICIENCY CLASSES OF SOLAR HOT WATER STORAGE TANKS, IF (PART OF) A SOLAR DEVICE

Extent: E+W+S+N.I.

The energy efficiency class of a solar hot water storage tank, if (part of) a solar device, shall be determined on the basis of its standing loss as set out in Table 4.
Table 4
Energy efficiency classes of solar hot water storage tanks, if (part of) a solar device
Energy efficiency class
Standing loss S in Watts, with storage volume V in litres
A+
S < 5,5 + 3,16 × V 0,4
A
5,5 + 3,16 × V 0,4 ≤ S < 8,5 + 4,25 × V 0,4
B
8,5 + 4,25 × V 0,4 ≤ S < 12 + 5,93 × V 0,4
C
12 + 5,93 × V 0,4 ≤ S < 16,66 + 8,33 × V 0,4
D
16,66 + 8,33 × V 0,4 ≤ S < 21 + 10,33 × V 0,4
E
21 + 10,33 × V 0,4 ≤ S < 26 + 13,66 × V 0,4
F
26 + 13,66 × V 0,4 ≤ S < 31 + 16,66 × V 0,4
G
S > 31 + 16,66 × V 0,4

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Source: https://www.legislation.gov.uk/eur/2013/811/annex/II/division/3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2013-811/annex-II/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.