# Commission Regulation (EU) No 814/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for water heaters and hot water storage tanks (Text with EEA relevance), Division 2: TECHNICAL PARAMETERS OF WATER HEATERS

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

The following parameters shall be calculated for water heaters under average climate conditions:
(a) the water heating energy efficiency ηwh in %, rounded to one decimal place;
in addition, for solar water heaters under average climate conditions:
(b) the annual non-solar heat contribution Qnonsol in kWh in terms of primary energy for electricity and/or in kWh in terms of GCV for fuels, rounded to one decimal place;
(c) the heat generator water heating energy efficiency ηwh,nonsol in %, rounded to one decimal place;
(d) the annual auxiliary electricity consumption Qaux in kWh, rounded to one decimal place.

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Source: https://www.legislation.gov.uk/eur/2013/814/annex/IV/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2013-814/annex-IV/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.