Answer first
Solar can reduce the electricity a heat pump buys from the grid, especially in brighter shoulder months and when hot-water or heating operation can use daytime generation. The overlap is lower during short, dark winter days when heat demand is often highest.
A battery and suitable time-of-use tariff can increase flexibility, but each adds cost. Model the heat pump, solar, battery and tariff together rather than assuming every solar unit will be “free heat”.
DESNZ-modelled upper saving for heat pump + solar + battery versus gas, based on 2024 average prices
View sourceTechnology, tariff and household scenarios modelled in the cited research
View sourceDirect solar value depends on matching household demand with generation
View sourceDiscuss a joined-up heat-pump and home-energy plan
Share your postcode, current heating and the bill question you want answered. FLO can explain what needs measuring before any saving figure is treated as realistic.
The two technologies have opposite seasonal peaks
A heat pump usually uses most electricity during the heating season. Solar photovoltaic output peaks in brighter months. That mismatch means annual generation cannot simply be subtracted from annual heat-pump consumption as if every unit were available at the right time.
There is still useful overlap. Spring and autumn space heating, year-round hot water and daytime household loads can use solar directly. A well-controlled system may schedule some hot-water production when generation is expected without compromising hygiene or comfort.
Self-consumption, export and import all have a value
A solar unit used in the home avoids an imported unit at the tariff that would otherwise apply. An exported unit earns the export rate. Those values are not automatically equal, and both can change with the supplier and tariff.
Use half-hourly data or a reputable model to estimate what happens by time of day and season. A simple annual total can overstate savings if it assumes summer generation can directly meet winter heating.
- Expected monthly solar generation
- Heat-pump and household demand by time of day
- Import rate in each tariff period
- Export payment and eligibility
- Battery capacity, power limit, losses and warranty
What the current research does—and does not—show
Energy Saving Trust reported DESNZ modelling in 2026 that found a household adopting a heat pump, solar panels and a battery could save up to £550 a year compared with a gas boiler, using average 2024 energy prices. Its broader research modelled more than one million combinations of performance, tariffs, technology sizes and usage patterns.
“Up to” is not an expectation for every home. The same research emphasises that combinations perform best with a suitable time-of-use tariff and that the market is complex. Roof orientation, shading, system size, demand and finance all need household-specific figures.
A battery helps timing, not winter generation
A battery can store midday solar for evening use or charge when grid electricity is cheaper. It cannot create energy, and a small battery may not cover a heat pump’s demand through a long cold evening. The inverter and battery power rating can also limit how quickly energy moves.
Compare the battery’s additional capital cost with realistic extra savings over its warranty life. If the aim is resilience, backup capability must be specified separately; many ordinary battery systems do not power the whole home during an outage.
Ask for one joined-up energy model
The useful proposal shows the heat pump’s estimated electricity, the solar generation profile, direct use, battery flows, imports, exports and tariff. It should also separate assumptions from guarantees.
If budget is limited, compare staged options: heat pump alone; heat pump plus solar; and heat pump, solar and battery. That makes clear which part of the package earns its place.
What to read next
Related answers and services
Questions people also ask
Will solar panels run my heat pump for free?+
They can supply some heat-pump electricity when generation and demand overlap, but winter demand often exceeds solar output. Grid imports normally remain.
Do I need a battery with solar and a heat pump?+
No. A battery can improve timing and tariff flexibility, but it should be justified by a household-specific model and its additional cost.
Can I add solar after the heat pump?+
Often yes. Plan electrical capacity, roof use, metering and controls so later additions remain practical.
Evidence used for this answer
Figures are explained in context and links go to the independent source. Prices, tariffs, scheme rules and standards can change, so check the source again before making a financial or technical decision.
- Home Energy Scotland: heat pumpsCurrent Scottish guidance on typical costs, savings, lifespan, comfort and combining a heat pump with solar panels.
- Energy Saving Trust: low-carbon technology and tariff combinations2026 research on the interaction between heat pumps, solar, batteries and time-of-use tariffs.
- Energy Saving Trust: the most efficient way to run a heat pumpGuidance on weather compensation, longer run periods, setbacks, radiators, hot water and smart energy use.
- Energy Saving Trust: time-of-use tariffsHow half-hourly smart tariffs work, when flexibility helps and what to compare before switching.