Solar Panels and Heat Pumps Explained
Heat pumps and solar panels are often sold as a natural pair, and they can be, but the fit is less automatic than it sounds because of when each one is doing most of its work.
The timing problem
Solar panels generate most of their output in spring and summer, in the middle of the day. Heat pumps work hardest in autumn and winter, and often run more in the early morning and evening to bring a home up to temperature. That mismatch means a lot of the electricity your heat pump uses in the months it matters most simply isn’t being generated by your panels at the same time.
Where the overlap does help
- Hot water heating in summer. If your heat pump also handles hot water, running that cycle during the day lets it draw directly from solar generation rather than the grid.
- Homes with a battery. Storing summer surplus generation and, more relevantly, being on a cheap overnight tariff to run the heat pump in winter, does more for running costs than solar generation alone.
- Shoulder seasons. In spring and autumn, when both systems are active, a well-sized heat pump running during daylight hours can use a meaningful share of solar output.
What actually cuts your heating bill
A heat pump’s running-cost savings versus gas depend more on your electricity tariff than most people expect, before solar is even part of the equation. On a standard tariff the gap can be slim, sometimes running costs land close to a gas boiler’s. On a dedicated heat-pump or off-peak tariff, 30 to 70% lower running costs than gas are realistic. See our heat pump cost and savings guide for the full breakdown.
Should you install both together?
If you’re already getting quotes for one, it’s worth pricing the other, since sharing scaffolding, an installer visit and potentially a shared battery can reduce combined installation costs versus doing them separately. Just don’t expect solar alone to make a large dent in winter heating costs.
If a heat pump’s part of the plan, ask about planning permission at the same time: most air source installs still count as permitted development, but since 28 May 2026 that depends on meeting a stricter noise standard, capped at 37 dB(A) at your nearest neighbour’s window. Our heat pump types guide covers what that means. Get matched with installers for solar, heat pumps or both.
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Frequently asked questions
Do solar panels and heat pumps work well together?
They can, but the fit isn't automatic. Solar generates most in spring and summer during the day, while heat pumps work hardest in autumn and winter, often in the early morning and evening, so a lot of the electricity a heat pump uses doesn't line up with when panels are generating.
When does solar help a heat pump most?
Mainly for hot water heating run during the day in summer, homes with a battery that can store surplus generation or use a cheap overnight tariff, and shoulder seasons like spring and autumn when both systems are active.
Should I install solar and a heat pump together?
If you're already getting quotes for one, it's worth pricing the other, since sharing scaffolding and an installer visit can reduce combined installation costs versus doing them separately.