Mains gas boiler to air source heat pump
Typical annual saving: £100–£400. Estimated payback: 10–14 years (with grant).
Network standards
- MCS-Certified Installers Only
- TrustMark / Which? Trusted Trader Members
- Manufacturer-Approved (Daikin, Vaillant, Mitsubishi)
- £7,500 BUS Grant Application Help
- Quotes Usually Within 2–3 Working Days
- Free Heat Loss Survey Where Required
Quote terms, lead times, and grant eligibility vary by installer. UKHeatPumpQuotes is a matching service, not an installer.
Free, no-obligation
Get free heat pump quotes
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What kind of property is it?
Network standards
- MCS-Certified Installers Only
- TrustMark / Which? Trusted Trader Members
- Manufacturer-Approved (Daikin, Vaillant, Mitsubishi)
- £7,500 BUS Grant Application Help
- Quotes Usually Within 2–3 Working Days
- Free Heat Loss Survey Where Required
Quote terms, lead times, and grant eligibility vary by installer. UKHeatPumpQuotes is a matching service, not an installer.
Switching from mains gas boiler: what changes
Switching from a gas boiler to a heat pump is the UK's most common heat pump scenario — but also the one with the narrowest savings. Gas is cheap relative to electricity, so payback depends heavily on insulation level and the electricity tariff. Octopus Cosy and similar heat-pump-friendly tariffs can shift the maths significantly.
The £7,500 BUS grant brings the heat pump install cost in line with — sometimes below — a like-for-like new combi boiler. Where you save: 20+ year heat pump lifespan vs 10–15 year boiler, no annual gas safety check, lower long-term carbon levy exposure.
Why act now
Why UK homeowners are switching
The Boiler Upgrade Scheme runs to 2028, energy prices remain volatile, and modern heat pumps work fine in British winters.
max BUS grant for an air source heat pump in England & Wales
UK heat pumps installed under the BUS scheme to date
to be matched with up to three local MCS-certified installers
typical heat pump lifespan vs. 10–15 years for a gas boiler
How it works
Three steps to a clear answer
No obligation, no pushy follow-ups, no fees from us — ever.
Free home survey
An MCS-certified installer visits to measure heat loss, check radiators, hot water cylinder space and existing pipework. Most surveys are free; complex retrofit cases sometimes require a paid heat-loss calculation, which the installer will quote upfront.
Written quote + grant
You receive a written, itemised quote — equipment, install labour, electrical work, commissioning, MCS certificate. The £7,500 BUS grant (England/Wales) is applied at the quote stage and paid by the installer to Ofgem on your behalf.
You decide — no pressure
Compare up to three quotes, ask questions, sleep on it. If you proceed, install typically takes 2–5 days depending on the size of the property and whether radiators need upgrading.
Common questions
Air source heat pump FAQs
Installed costs typically run £8,000 to £14,000 before grant for a normal home. Detached or larger properties can reach £16,000. After the £7,500 BUS grant in England & Wales, most homeowners pay £500–£8,500. Scotland's Home Energy Scotland scheme offers up to £15,000 in combined grant + interest-free loan, often making the heat pump cheaper than a like-for-like boiler replacement.
Verify any installer's MCS certification at mcscertified.com.
Ready to take a look?
Get matched with MCS-certified installers in your area
The £7,500 BUS grant runs to 2028 — there's no rush, but waiting another year on an old gas, oil or LPG boiler costs you running-cost savings every month. A free survey tells you whether the fit is straightforward, with zero commitment.
Educational content — not a substitute for an MCS-certified survey.
Authoritative sources cited
- GOV.UK — Boiler Upgrade Scheme ↗Official BUS grant scheme rules and eligibility (Ofgem-administered).
- MCS Certified Installer Database ↗The official MCS register of approved installers — verifies any installer's certification.
- Energy Saving Trust ↗Independent UK home-energy charity. Field-trial data on UK heat-pump performance and SCOP figures.
- Ofgem ↗UK energy regulator. Administers the BUS scheme and publishes installation statistics.
Statistics and figures on this site are derived from these sources unless otherwise stated. Errors? We correct promptly — see our corrections policy.
Continue your research
More UK heat pump resources
Sister sites we operate, each focused on a different decision step.