# 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 (a): From 26 September 2018 emissions of nitrogen oxides, expressed in nitrogen dioxide, of water heaters shall not exceed the following values:

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

conventional water heaters using gaseous fuels: 56 mg/kWh fuel input in terms of GCV,
conventional water heaters using liquid fuels: 120 mg/kWh fuel input in terms of GCV,
heat pump water heaters equipped with external combustion using gaseous fuels and solar water heaters using gaseous fuels: 70 mg/kWh fuel input in terms of GCV,
heat pump water heaters equipped with external combustion using liquid fuels and solar water heaters using liquid fuels: 120 mg/kWh fuel input in terms of GCV,
heat pump water heaters equipped with an internal combustion engine using gaseous fuels: 240 mg/kWh fuel input in terms of GCV,
heat pump water heaters equipped with an internal combustion engine using liquid fuels: 420 mg/kWh fuel input in terms of GCV.

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Source: https://www.legislation.gov.uk/eur/2013/814/annex/II/division/1/division/1.5/division/a (the official version)
Page: https://openlegislation.uk/eu-regulation-2013-814/annex-II/division-1/division-1.5/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.