Solar Panels with a Heat Pump: A Perfect Pairing

Do solar panels work with a heat pump?

Beautifully. A heat pump runs on electricity, and solar panels make electricity — so your roof can power your heating, cooling and hot water instead of burning gas. As homes electrify, pairing the two is one of the most effective ways to cut both bills and emissions. The main things to plan for are a few extra panels and the winter mismatch between when you need heat and when the sun shines.

This guide explains why the pairing works, how many panels a heat pump needs, and how much you can save.

Why they're a perfect pair

Gas heating locks you into a fuel you can't generate yourself. A heat pump turns heating into an electrical load — and electricity is something your panels produce for free during the day. Replace a gas boiler with a heat pump and a chunk of your home's energy demand shifts onto a bill you can offset with solar. The two technologies are the backbone of an "electrify everything" home.

How a heat pump uses electricity

A heat pump doesn't create heat by burning fuel; it moves heat from the outside air (or ground) into your home, which is why it's so efficient — typically delivering 3–4 units of heat per unit of electricity. That efficiency (its COP) is what makes running it on solar so cheap. But it still adds a meaningful electrical load, especially in winter, which is what drives the extra panels.

How many extra panels?

It depends on your climate and how much heating you need, but a heat pump can add 3,000–5,000 kWh a year to a home's electricity use — similar to or more than an EV. That translates to roughly 6–10 extra panels to cover it on an annual basis. As always, size it into the system from the start rather than retrofitting (see how many panels you need).

The winter mismatch

Here's the catch: you need the most heat in winter, exactly when solar production is lowest. So while your panels may fully cover heat-pump cooling in summer, in deep winter they'll only offset part of the heating load, and you'll draw the rest from the grid. That's fine — it's the same balancing the grid does for any solar home — but it means a heat pump rarely runs "100% on solar" year-round without a very large system.

How much you save

Even with the winter mismatch, the savings are substantial. A heat pump is far more efficient than a gas boiler, and running it partly on free solar pushes the effective heating cost down further. The chart compares typical annual heating costs.

The biggest savings come from using the heat pump during daylight — heating water or pre-warming the house while the panels produce — so you self-consume rather than buy power.

Where a battery or the grid fits

In summer, surplus solar easily runs the heat pump. In winter, you'll lean on the grid for evening and cloudy-day heating. A battery can shift some daytime solar into the evening, improving self-consumption, but in mid-winter there's simply less solar to store — so a battery helps at the margins rather than making you self-sufficient. For most homes the grid remains the practical winter backup; weigh a battery as you would for any system (see do you need a battery).

Sizing solar for a heat pump

If a heat pump is in your plans, tell your installer up front so they can add the 6–10 panels and size the inverter accordingly. Oversizing slightly helps claw back some winter production. And because much of the heat-pump load is controllable (hot water, scheduling), smart timing to coincide with solar peaks meaningfully boosts how much you cover yourself.

FAQ

Can solar fully power a heat pump? Over a year it can offset most of the load, but the winter mismatch means you'll still draw from the grid in the coldest months unless your system is very large.

How many panels does a heat pump need? Roughly 6–10 extra, depending on climate and heating demand — comparable to adding an EV.

Is a heat pump on solar cheaper than gas? Yes — heat pumps are highly efficient, and running them partly on free solar lowers the effective cost well below gas heating.

Do I need a battery? No, but it improves self-consumption. In winter there's less solar to store, so the grid usually remains the practical backup.

Bottom line

Solar and a heat pump are a natural pairing: both electric, both central to a low-bill, low-carbon home. Plan for 6–10 extra panels and accept that deep winter leans on the grid, but enjoy heating and cooling that's far cheaper than gas — especially when you run the heat pump in daylight. Start with how many panels you need and how solar works.

Last updated June 2026. Informational only — heating loads and savings vary by climate, home and tariffs.