Is a Heat Pump Worth It in the UK in 2026? Running Costs, the £7,500 Grant, and the Homes Where It Pays

A heat pump is now the single most-subsidised home-energy upgrade in the UK, and for the right house it can cut carbon and roughly match a gas boiler on running cost. But "the right house" is the catch — the same system that saves one household money leaves another worse off. We sell and install nothing, so here is the honest version: how the grant works, what it actually costs to run, and the homes where it does and doesn't add up.

The £7,500 grant: what the Boiler Upgrade Scheme covers

In England and Wales, the Boiler Upgrade Scheme (BUS), administered by Ofgem/GOV.UK, gives a £7,500 grant toward an air-source or ground-source heat pump. The grant is applied by your installer as an upfront discount — you don't claim it back yourself. To qualify you need an MCS-certified installer and product, and the heat pump must replace a fossil-fuel boiler or direct electric heating. Since the 28 April 2026 amendment, an EPC is no longer required.

A few numbers people get wrong:

• The £9,000 rate exists only for off-gas-grid oil or LPG homes, and it is a temporary uplift ending 31 March 2027. If you're on mains gas, your figure is £7,500, not £9,000.
• Air-to-air heat pumps get £2,500; biomass gets £5,000 — different technologies, different figures.
• Scotland is different. There is no BUS in Scotland — it routes through Home Energy Scotland (grant plus an interest-free loan). Northern Ireland is a separate market again. Check the scheme for your nation before assuming £7,500.

After the grant, a typical installed cost lands somewhere around £3,000–£7,000, depending on the property, radiator work and system size.

Running costs: it's all about the tariff

A heat pump runs on electricity, which at the Ofgem price cap is around 24.67p/kWh (the cap resets every quarter and standing charges apply on top — always read your actual bill). That sounds expensive next to gas, but a heat pump delivers roughly three units of heat per unit of electricity, which is what closes the gap.

The real lever is a heat-pump smart tariff. Options such as Cosy Octopus are built around cheap windows tuned for heat-pump running, and all smart tariffs require a smart meter (SMETS2). The discipline is to shift as much load as possible — heating runs, hot water, the washing machine — into the cheap window.

The homes where a heat pump pays

A heat pump works best when the house can be heated gently over long periods at a lower flow temperature. That favours:

• Reasonably insulated homes — loft and cavity-wall insulation done, draughts dealt with.
• Homes with room for bigger radiators or underfloor heating, so the system can run cool and efficient.
• Off-gas-grid homes on oil or LPG, where the fuel being replaced is expensive and the grant may be £9,000 (until 31 March 2027). This is often the strongest case of all.
• Households willing to use a smart tariff and shift load — the running-cost case leans heavily on this.

Here's the catch — where it doesn't pay

Independence means saying it plainly: a heat pump is not a good fit for every home.

• Poorly insulated, draughty properties. If heat leaks out as fast as a cool system puts it in, the heat pump works hard, efficiency drops, and running costs climb. Insulation first — sometimes that's the whole answer.
• Homes on cheap mains gas with a newish boiler. If your gas boiler has years of life left, replacing it today may never pay back on running costs alone, even with £7,500 off.
• No space for larger emitters. If you can't fit bigger radiators or underfloor heating and the system is forced to run hot, efficiency — and your savings — suffer.
• Households that won't engage with a smart tariff. On a flat standard rate, the running-cost gap against gas narrows or disappears.

There is also the up-front gap: even after the grant, £3,000–£7,000 is real money, and if your running costs barely move, the payback can stretch well beyond the appliance's comfortable lifespan.

How to decide for your actual home

The honest process is boring but it works:

• Read your current bill — unit rate, standing charge, and what you actually spend on heating now.
• Check your insulation and radiator situation before anything else.
• Confirm which grant applies to your nation and fuel (BUS £7,500, the £9,000 off-gas uplift to 31 March 2027, or Home Energy Scotland).
• Model running costs on a real heat-pump smart tariff, with the current rate confirmed in writing.
• If your income is under roughly £36k and your EPC is D–G, check the Warm Homes: Local Grant — a separate, income-based route that can fund heat pumps and insulation for eligible households.

Every "free" comparison site gets paid by the installer it sends you to — which is exactly why it rarely tells you the heat pump might not pay. We take nothing from any installer, manufacturer or energy supplier. Our only job is to run your numbers honestly and tell you whether a heat pump is worth it for your home — even when the answer is "not yet, insulate first".

Figures in this guide are current at the date of publication and indicative only — SEG/export rates change with 30 days' notice, the Ofgem price cap resets quarterly, and grant terms change. Confirm the current numbers for your situation before you commit. This is general information, not personal financial advice.