A heat pump is essentially
a fridge running backwards.
It's not magic — it's good physics. Here's what to know before you spend £10,000+ on a new heating system.
The four things to check first
Before any installer turns up at your house, run these checks. They'll save you a lot of wasted Saturdays.
1. Your home's heat loss
A heat pump works best in a well-insulated home. Loft insulation, cavity wall, draught-proofing — these matter more than the kit itself. A good installer will do a room-by-room heat loss survey, not a sales pitch.
2. Radiator size
Heat pumps run cooler water than gas boilers, so radiators often need to be larger. Some can stay; some can't. Underfloor heating is ideal but not required.
3. Outdoor unit space
You need space outside for the ASHP unit — typically beside a wall, on a flat base, with airflow. Not all terraced houses can accommodate one without planning consideration.
4. Hot water cylinder space
If you're on a combi boiler, you'll need a cylinder — typically in an airing cupboard or loft. Plan the space before you sign anything.
The Boiler Upgrade Scheme (BUS): £7,500 off, explained
The UK government will pay you £7,500 towards an air-source heat pump installation. Here's how it actually works.
Who qualifies
England & Wales homeowners replacing a fossil-fuel boiler (gas, oil, LPG) with an air-source or ground-source heat pump. New-builds don't qualify.
How you claim it
Your MCS-certified installer applies on your behalf and deducts the £7,500 from your quote. You don't apply directly.
What it doesn't cover
The grant covers the heat pump itself — not new radiators, hot water cylinders or extensive insulation work. Make sure the quote splits these out.
Coming soon to this hub
ASHP vs GSHP — which suits a UK home?
Air-source vs ground-source: when each makes sense, the cost difference, and disruption to your garden.
Heat pump suitability by house type
Victorian terrace, 1930s semi, 1960s bungalow, new-build. What changes and what's the same.
BUS grant eligibility checker
Answer four questions to find out if your home qualifies for the £7,500 grant.
Get up to 3 quotes from MCS-certified heat pump installers
Tell us about your home. We match you with vetted UK installers — no sales pressure.
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