# The Boiler Upgrade Scheme (England and Wales) (Amendment) Regulations 2026, Regulation 3: Regulation 2 amended (interpretation)


(1) Regulation 2 is amended as follows.
(2) In paragraph (1), at the appropriate places, insert—
“air-to-air heat pump” means a plant which generates heat using a thermodynamic cycle by transferring energy stored in the form of heat in the air and uses that energy to heat air for the purposes of space heating;
“Microgeneration Certification Scheme”means the scheme under that name operated by the MCS Service Company Ltd (a company registered in England and Wales with company number 07759366);
“non-residential building” means a building or building unit which is used—
(a) for the purposes of a trade, profession or vocation,
(b) as an office (whether or not for the purposes of a trade, profession or vocation),
(c) for educational purposes, or
(d) for religious purposes,
and which is not in use as, or as part of, a dwelling house;
“supplementary appliance” means a heating appliance installed in an eligible property that is not fuelled by fossil fuel”.
(3) For the definition of “air source heat pump”, substitute—
““air-to-water heat pump” means a plant which generates heat using a thermodynamic cycle by transferring energy stored in the form of heat in the air and uses that energy to heat a liquid for the purposes of space heating;”.
(4) In the definition of “building”, after “roofed” , insert “, permanent”.
(5) In the definition of “ground source heat pump”, after “to heat a liquid”, insert “for the purposes of space heating”.
(6) In the definition of “heat pump”—
(a) for “air source heat pump”, substitute “air-to-air heat pump or an air-to-water heat pump”,
(b) for “or both”, substitute “or any combination of the three”.
(7) For the definition of “installer”, substitute—
““installer” means a person who is certified by the Microgeneration Certification Scheme or a subsequent version of the Microgeneration Certification Scheme, approved by the Secretary of State under regulation 4(1A);”.
(8) In the definition of “related property”, omit “and where the building, building unit or swimming pool is not covered by the valid energy performance certificate for that property”.
(9) In the definition of “relevant financial year”, for sub-paragraphs (e) and (f), substitute—
“(e) 1st April 2026,
(f) 1st April 2027,
(g) 1st April 2028, or
(h) 1st April 2029;”.
(10) For the definition of “urban area”, substitute—
““urban area” means an area classified as urban in the “2021 rural-urban classification of output areas” published by the Office for National Statistics in August 2025;”.
(11) Omit paragraph (4).

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Source: https://www.legislation.gov.uk/uksi/2026/390/regulation/3 (the official version)
Page: https://openlegislation.uk/boiler-upgrade-scheme-england-and-wales-amendment-regulations-2026/regulation-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.