Merton: £2,500 air-to-air heat pump grant

Merton's heating mix is fairly typical for the areas we track: roughly 86.4% mains gas, 13.1% electric, and a small share of oil, LPG or solid fuel. None of that changes the grant rule - it pays on replacement, whatever heating type you currently have, once an MCS-certified installer confirms it.

The split across Merton's EPC-certified stock is 86.4% mains gas, 13.1% electric and 0.2% oil, LPG or solid fuel, heating a home of the kinds we track locally runs to roughly £558 a year, band D is the commonest EPC rating here, covering 47% of rated homes and the fuel-mix split above is drawn from 98.3% of Merton's EPC certificates, which makes it a genuine local measurement rather than a national average pinned to your postcode.

For a Merton home, one decision settles whether the grant pays: replace your heating, or keep it. Both outcomes below carry equal weight - neither is the "default" answer.

Eligible - you replace your heating. If an air-to-air heat pump replaces a fossil-fuel or electric system (mains gas, oil, LPG, electric storage heaters or direct electric) and is fitted by an MCS-certified installer, the £2,500 applies, and the old system is decommissioned rather than run alongside the new one.

Not eligible - you keep your boiler. If you keep your existing heating and add cooling as a standalone unit, that cooling-only add-on does not qualify for the Boiler Upgrade Scheme grant, however it is marketed. Adding air conditioning while keeping your gas boiler is a private-pay job, carried out by an F-Gas / REFCOM-registered engineer rather than an MCS-certified one.

The grant itself is law and your eligibility is real, but no air-to-air product has reached the MCS Product Directory yet, so no installer can issue a Boiler Upgrade Scheme voucher today. Air-to-air enters MCS scheme scope on 5 December 2026, and vouchers follow once certified products list. Get quotes now, but treat the grant as pending rather than banked.

Grant rules as of August 2026 and subject to change, so always confirm the current terms on gov.uk before applying. This is a national scheme, so the London Borough of Merton plays no part in deciding whether you qualify. Planning permission for the outdoor unit in Merton, if you need it, is a different and entirely separate matter, covered on our planning pages.

MCS - the certification scheme for registered installers - is the quality standard your installer must hold for the grant to pay. It certifies the installer and the installation work, never the homeowner and never GetComfort.

We route a grant-eligible air-to-air enquiry from Merton to an MCS-certified installer, and a cooling-only job to an F-Gas / REFCOM-registered engineer instead, because refrigerant-only work is what those engineers are licensed for. Confusing the two is the single most common mistake homeowners make when researching this grant.