Heat pump vs gas boiler running cost (UK, 2026)
Heat pump economics changed in 2025 — Octopus Cosy and similar tariffs make heat pumps cheaper to run than mains gas for most UK homes, before any government grant. Run the numbers for your home below.
Frequently asked questions
Is a heat pump cheaper than gas in the UK?
On a heat-pump-friendly tariff like Octopus Cosy, typically yes — by £100–£300/year for a well-insulated 4-bed. On the standard tariff it's often roughly break-even.
What's the £7,500 grant?
The Boiler Upgrade Scheme (England + Wales) gives £7,500 toward an air-source heat pump. After grant, install cost is typically £4–8k vs £2.5–4k for a new gas boiler.
Does solar help a heat pump?
Yes in shoulder seasons — autumn/spring the heat pump runs in daylight and can run from solar. Winter peak demand is mostly out-of-daylight, so solar contributes less then.