Compare · Updated July 2026

Solar Panels vs a Heat Pump — Which Is Cheaper to Run? (2026 UK)

It's the most common green-home question of 2026 — but it's slightly the wrong question, because the two do different jobs. Solar panels cut the cost of the electricity you already buy, saving a typical home £400–£900 a year. An air-source heat pump replaces your gas or oil boiler, and whether it's cheaper to run than that boiler depends on your insulation, your tariff and the pump's efficiency. This guide compares both on real running cost, install price, grants and payback — with a worked example — and shows why the genuinely cheapest home to run in 2026 pairs the two together.

Annual running cost compared Grants & 0% VAT Worked example
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✅Reviewed by the BestBuilders editorial team on 1 July 2026. All running-cost figures, grant values, VAT rates and efficiency assumptions verified against current Q3 2026 UK market data and regulator publications. Editorial standards: /editorial-standards.
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Quick Answer

Solar or a heat pump — which is cheaper to run?

  • Solar panels are the surer running-cost win. They cut £400–£900 a year off your electricity bill regardless of how you heat your home, with no change to your heating system and 0% VAT until March 2027.
  • A heat pump can be cheaper to run than a gas boiler — but only in a well-insulated home on a good heat-pump electricity tariff. In a draughty home it can cost more to run than gas, even with a SCOP of 3.5+.
  • The cheapest home to run pairs both: solar generates cheap daytime electricity that the heat pump then uses to make heat, slashing the pump's running cost. With the £7,500 Boiler Upgrade Scheme grant, that combination is more affordable to install than most people expect.
Side by Side

Solar vs Heat Pump — The Numbers That Matter in 2026

AreaSolar Panels (4kW)Air-Source Heat Pump
What it replacesImported electricityGas / oil boiler
Typical 2026 install cost£5,000–£9,000£9,000–£14,000 (before grant)
Government grantNone (0% VAT only)£7,500 Boiler Upgrade Scheme
Annual running impactSaves £400–£900/yrRoughly matches or beats gas in an insulated home
Depends heavily onRoof aspect & daytime usageInsulation & electricity tariff
Payback8–12 yearsRunning-cost led, not payback led
Lifespan25–30 yrs (10–12 inverter)15–20 years

Both solar and heat pumps carry 0% VAT on supply & installation in the UK until at least 31 March 2027. A heat pump's real running cost hinges on its Seasonal Coefficient of Performance (SCOP) — aim for 3.5+ — and on being paired with a heat-pump-specific electricity tariff.

Worked Example

Real Numbers: A 3-Bed Semi Heated by Gas in 2026

A Midlands 3-bed semi spending ~£1,100/yr on electricity and ~£950/yr on gas heating. Here's how each upgrade changes the running cost.

Add Solar (4kW)

−£620/yr electricity
No change to heating; keeps the existing gas boiler.
  • ~£520/yr bill saving + ~£100/yr SEG export income
  • Install ~£6,000, payback ~9.7 years
  • Zero disruption to heating; works from day one

Add a Heat Pump (with BUS grant)

≈ Level running cost
Replaces the gas boiler; £7,500 grant nets install to ~£4,500–£6,500.
  • On a heat-pump tariff, heating cost lands within ±£100/yr of gas
  • Removes ~£100/yr gas standing charge if you go all-electric
  • Biggest lever is insulation — top up loft & cavity first

Verdict: For a guaranteed running-cost cut with no heating disruption, solar wins outright on this home. The heat pump's value is strategic — it decarbonises heating and, on the right tariff, roughly matches gas today while insulating you from future gas price rises. Do solar first for the quick saving; add the heat pump when your boiler is due for replacement, and the two together are the cheapest possible way to run the house.

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Frequently Asked

Common Questions

They aren't directly comparable — solar cuts your electricity bill while a heat pump replaces your heating fuel. Solar delivers a more predictable £400–£900/yr saving. A heat pump only becomes cheaper to run than gas in a well-insulated home on a heat-pump electricity tariff.
Partly. Solar generates most in the day and in summer, when heating demand is low, so it won't run a heat pump through a winter evening. But it meaningfully cuts the pump's annual electricity cost — especially with a battery to shift daytime generation into the evening.
The Boiler Upgrade Scheme gives £7,500 towards an air-source heat pump in England and Wales. Solar has no direct grant but carries 0% VAT on installation until 31 March 2027. Some homes also qualify for insulation support through ECO4 or the Warm Homes local grant.
Yes — it's the single biggest factor in a heat pump's running cost. A poorly insulated home forces the pump to work at lower efficiency, which can make it more expensive to run than gas. Top up loft and cavity insulation first; it's cheap and improves any heating system.
Solar usually first — it delivers an immediate saving with no disruption to your heating. Add the heat pump when your boiler is near the end of its life, so you're not scrapping a working boiler. Insulation improvements should ideally come before the heat pump.
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