# Commission Regulation (EU) No 813/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for space heaters and combination heaters (Text with EEA relevance), Division (b): From 26 September 2017 the water heating energy efficiency of combination heaters shall not fall below the following values:

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

Declared load profile
3XS
XXS
XS
S
M
L
XL
XXL
3XL
4XL
Water heating energy efficiency
32 %
32 %
32 %
32 %
36 %
37 %
38 %
60 %
64 %
64 %

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Source: https://www.legislation.gov.uk/eur/2013/813/annex/II/division/2/division/b (the official version)
Page: https://openlegislation.uk/eu-regulation-2013-813/annex-II/division-2/division-b
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.