{
  "url": "https://openlegislation.uk/domestic-renewable-heat-incentive-scheme-regulations-2014/regulation-29",
  "json_url": "https://openlegislation.uk/domestic-renewable-heat-incentive-scheme-regulations-2014/regulation-29.json",
  "legislation": "uksi/2014/928",
  "legislation_title": "The Domestic Renewable Heat Incentive Scheme Regulations 2014",
  "legislation_url": "https://openlegislation.uk/domestic-renewable-heat-incentive-scheme-regulations-2014",
  "path": "regulation/29",
  "kind": "regulation",
  "number": "29",
  "heading": "Calculation of deemed annual heat generation",
  "text": "(1) The amount of heat in kWh which an accredited domestic plant is deemed to generate every 12 months (the “deemed annual heat generation”) is calculated in accordance with this regulation.\n(2) If the accredited domestic plant is a biomass plant which provides space heating, but not heating for domestic hot water, to the RHI property, the deemed annual heat generation is—\n(a) for an accredited domestic plant with a tariff start date before the second relevant date, the heat demand for space heating specified in the relevant EPC for that property; or\n(b) for an accredited domestic plant with a tariff start date on or after the second relevant date, the lower of—\n(i) the heat demand for space heating specified in the relevant EPC for that property; or\n(ii) 25,000 kWh.\n(3) If the accredited domestic plant is a biomass plant which provides both space heating and domestic hot water heating to the RHI property, the deemed annual heat generation is—\n(a) for an accredited domestic plant with a tariff start date before the second relevant date, the heat demand for space heating and water heating specified in the relevant EPC for that property; or\n(b) for an accredited domestic plant with a tariff start date on or after the second relevant date, the lower of—\n(i) the heat demand for space heating and water heating specified in the relevant EPC for that property; or\n(ii) 25,000 kWh.\n(4) If the accredited domestic plant is a heat pump which provides space heating, but not heating for domestic hot water, to the RHI property, the deemed annual heat generation is—\n(a) for an accredited domestic plant with a tariff start date before the second relevant date, calculated in accordance with the following formula—\nA×(1−1B)where—\n(i)A is the heat demand for space heating specified in the relevant EPC for that property; and\n(ii)B is the seasonal performance factor for the heat pump; or\n(b) for an accredited domestic plant with a tariff start date on or after the second relevant date, the lower of—\n(i) the result of the formula in sub-paragraph (a); or\n(ii) the result of the following formula—\nC×(1−1B)where—\n(aa)C is 20,000 kWh in the case of an air source heat pump, or 30,000 kWh in the case of a ground source heat pump; and\n(aa)B is the seasonal performance factor for the heat pump.\n(5) If the accredited domestic plant is a heat pump which provides both space heating and domestic hot water heating to the RHI property, the deemed annual heat generation is—\n(a) for an accredited domestic plant with a tariff start date before the second relevant date, calculated in accordance with the following formula—\nA×(1−1B)where—\n(i)A is the heat demand for space heating and water heating specified in the relevant EPC for that property; and\n(ii)B is the seasonal performance factor for the heat pump; or\n(b) for an accredited domestic plant with a tariff start date on or after the second relevant date, the lower of—\n(i) the result of the formula in sub-paragraph (a); or\n(ii) the result of the following formula—\nC×(1−1B)where—\n(aa)C is 20,000 kWh in the case of an air source heat pump, or 30,000 kWh in the case of a ground source heat pump; and\n(bb)B is the seasonal performance factor for the heat pump.\n(6) If the accredited domestic plant is a solar thermal plant and its first commissioning date is on or after the relevant date, its deemed annual heat generation is the total heat generated by that plant on an annual basis calculated in accordance with Issue 2.0 of the document entitled “MCS 024 Solar Thermal Domestic Hot Water Energy Calculator” published on 1st December 2021 or a subsequent version or issue of that document approved by the Secretary of State under regulation 2B(2).\n(7) If the accredited domestic plant is a solar thermal plant and its first commissioning date is earlier than the relevant date, the deemed annual heat generation is the total heat which the Authority estimates, at the time it gives accreditation, that the accredited domestic plant will generate on an annual basis, having regard to any relevant information about the accredited domestic plant on the MCS register.",
  "extent": "E+W+S",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Reg. 29(2)-(5) substituted (20.9.2017) by The Renewable Heat Incentive Scheme and Domestic Renewable Heat Incentive Scheme (Amendment) (No. 2) Regulations 2017 (S.I. 2017/857), regs. 1, 15"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Words in reg. 29(6) substituted (1.4.2022) by The Domestic Renewable Heat Incentive Scheme and Renewable Heat Incentive Scheme (Amendment) Regulations 2022 (S.I. 2022/159), regs. 1(3), 10"
    },
    {
      "type": "I",
      "label": "I1",
      "text": "Reg. 29 in force at 9.4.2014, see reg. 1"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2014/928/regulation/29",
    "retrieved_at": "2026-10-29T00:19:53.649371+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."
}