Heat pumps are everywhere in the news right now. The government wants them in millions of homes by 2030, there's a £7,500 grant to help cover the cost, and energy companies are falling over themselves to sell you one. But is a heat pump actually worth it for your home, with your budget?
This guide gives you the honest answer — including the situations where a heat pump doesn't make sense.
How a Heat Pump Works (in 30 Seconds)
A heat pump doesn't generate heat — it moves it. An air source heat pump (the most common type in UK homes) extracts warmth from the outside air and transfers it inside to heat your home and hot water. Even when it's cold outside, there's enough ambient energy in the air for the system to work. For every 1 kWh of electricity it uses, a well-installed heat pump typically delivers 3–4 kWh of heat — making it roughly 300–400% efficient compared to a gas boiler's 90–95%.
What Does a Heat Pump Cost in 2026?
| Type | Installed Cost | After £7,500 BUS Grant |
|---|---|---|
| Air source heat pump | £8,000–£14,000 | £4,500–£6,500 |
| Ground source heat pump | £18,000–£35,000 | £10,500–£27,500 |
The Boiler Upgrade Scheme (BUS) provides a £7,500 grant and has been extended until 2030. There's also 0% VAT on heat pumps until March 2027. After the grant, most homeowners pay £4,500–£6,500 out of pocket for an air source system — comparable to a premium gas boiler installation.
Important: Pricing varies hugely between installers. Differences of £3,000–£5,000 for the same property are common. Always get multiple quotes from MCS-certified installers.
Running Costs: Heat Pump vs Gas Boiler
This is where it gets nuanced. Under Ofgem's Q1 2026 price cap, electricity is roughly 24p/kWh and gas about 6p/kWh. Gas is cheaper per unit — but heat pumps are far more efficient per unit of heat delivered.
| System | Efficiency | Cost Per kWh of Heat | Typical Annual Bill |
|---|---|---|---|
| Modern gas boiler (A-rated) | ~92% | ~6.5p | £900–£1,100 |
| Heat pump (standard tariff) | ~310% | ~7.7p | £950–£1,150 |
| Heat pump (specialist tariff) | ~310% | ~4.8p | £600–£800 |
| Old gas boiler (15+ yrs) | ~75% | ~8p | £1,200–£1,500 |
| Oil boiler | ~85% | ~9p | £1,300–£1,800 |
On a standard electricity tariff, a heat pump roughly matches a new gas boiler on running costs. The economic case becomes much stronger when you use a specialist heat pump tariff (like Octopus Cosy or EDF GoElectric) which can bring electricity down to around 15p/kWh, or when you're replacing an older boiler or oil/LPG system where savings of £250–£1,200 per year are realistic.
When a Heat Pump IS Worth It
- You're replacing an old or failing boiler — likely saving £200–£500 per year in running costs.
- You're off the gas grid — replacing oil or LPG heating delivers savings of £500–£1,200 per year.
- Your home is reasonably well insulated — EPC rating D or better means it'll run efficiently.
- You'll switch to a specialist tariff — this can cut running costs by 30–40%.
- You plan to stay for 10+ years — heat pumps last around 20 years, so you need time for cumulative savings.
- You're pairing with solar panels — using free solar electricity to power your heat pump makes both investments work harder.
When a Heat Pump Might NOT Be Worth It
- You have a new, working gas boiler — replacing a recently installed combi boiler rarely makes financial sense.
- Your home has poor insulation — EPC E, F or G means you should insulate first. A heat pump in a leaky home costs more to run.
- You're selling within 5 years — you may not recoup the investment, though it does improve your EPC rating.
- You can't accommodate a hot water cylinder — replacing a combi boiler means you'll need space for a cylinder.
Other Things to Consider
Radiators: Heat pumps run at lower flow temperatures than gas boilers. Older, undersized radiators may need upgrading (£3,000–£9,000 if all need replacing). Underfloor heating is the ideal partner for a heat pump.
Noise: Modern units run at 35–54 dB — roughly a fridge or quiet conversation. Not silent, but rarely an issue.
Installation: Takes 2–5 days, longer than a boiler swap. A proper heat loss survey beforehand is essential to correct sizing.
The Bottom Line
For most UK homeowners replacing an older heating system, a heat pump is a sound investment in 2026. The £7,500 grant, 0% VAT, specialist tariffs, and a 20-year lifespan make the economics favourable — especially if you act while incentives are available. If your gas boiler is running fine, focus on insulation now and plan for a heat pump when it reaches end of life.
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Get My Free Assessment →This article is for informational purposes only and does not constitute financial advice. Costs and savings vary by property, location and usage. Grant availability is subject to government policy. Always get personalised quotes from MCS-certified installers.