{
  "url": "https://openlegislation.uk/eu-regulation-2015-1189/annex-III/division-4",
  "json_url": "https://openlegislation.uk/eu-regulation-2015-1189/annex-III/division-4.json",
  "legislation": "eur/2015/1189",
  "legislation_title": "Commission Regulation (EU) 2015/1189 of 28 April 2015 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for solid fuel boilers (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2015-1189",
  "path": "annex/III/division/4",
  "kind": "division",
  "number": "4",
  "heading": "Specific conditions for seasonal space heating energy efficiency",
  "text": "(a)The seasonal space heating energy efficiency ηs is defined as:\nηs = ηson – F(1) – F(2) + F(3)\nwhere:\n(1)ηson is the seasonal space heating energy efficiency in active mode expressed as a percentage, calculated as set out in point 4(b);\n(2)F(1) accounts for a loss of seasonal space heating energy efficiency due to adjusted contributions of temperature controls; F(1) = 3 %;\n(3)F(2) accounts for a negative contribution to the seasonal space heating energy efficiency by auxiliary electricity consumption, expressed as a percentage, and is calculated as set out in point 4(c);\n(4)F(3) accounts for a positive contribution to the seasonal space heating energy efficiency by the electrical efficiency of solid fuel cogeneration boilers, expressed as a percentage, and is calculated as follows:\nF(3) = 2,5 × ηel,n\n(b)the seasonal space heating energy efficiency in active mode, ηson , is calculated as follows:\n(1)for manually stoked solid fuel boilers that can be operated at 50 % of the rated heat output in continuous mode, and for automatically stoked solid fuel boilers:\nηson = 0,85 × ηp + 0,15 × ηn\n(2)for manually stoked solid fuel boilers that cannot be operated at 50 % or less of the rated heat output in continuous mode, and for solid fuel cogeneration boilers:\nηson = ηn\n(c)F(2) is calculated as follows:\n(1)for manually stoked solid fuel boilers that can be operated at 50 % of the rated heat output in continuous mode, and for automatically stoked solid fuel boilers:\nF(2) = 2,5 × (0,15 × elmax + 0,85 × elmin + 1,3 × PSB )/(0,15 × Pn + 0,85 × Pp )\n(2)for manually stoked solid fuel boilers that cannot be operated at 50 % or less of the rated heat output in continuous mode, and for solid fuel cogeneration boilers:\nF(2) = 2,5 × (elmax + 1,3 × PSB)/Pn",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2015/1189/annex/III/division/4",
    "retrieved_at": "2026-11-01T14:46:34.528602+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}