In 40 seconds
A typical UK air source heat pump installation costs roughly £8,000–£16,000 before any grant — commonly around £12,500 for an average home. The Boiler Upgrade Scheme (BUS) gives eligible homeowners in England and Wales a £7,500 grant off an air source heat pump, which can bring the net cost down to roughly £500–£6,500. Heat pumps also carry 0% VAT. Whether one is right for you depends on your home's insulation, your current heating and your radiators — which is why the honest answer is always a range, and why the install should be done by an MCS-certified installer (required to claim the grant).
Most heat pump guidance is published by companies selling them, so the numbers tend to be optimistic. The pages below give honest cost ranges, explain exactly how the £7,500 grant works, and help you judge whether a heat pump suits your specific home — before you take a single quote.