⚖️ Comparison · Updated for 2026

Air source heat pump vs Gas boiler

Side-by-side comparison, when-to-use-each guide, and instant conversion. Reviewed for 2026.

Quick answer: Gas boilers heat water by burning gas (90% efficiency). Heat pumps extract heat from air using electricity — achieving 200-400% efficiency (COP 2-4). Because UK electricity costs roughly 3-4 times as much per kWh as gas (check the current Ofgem price cap), a heat pump needs a seasonal COP of roughly 3-4 to match gas on running costs. The £7,500 Boiler Upgrade Scheme grant significantly improves the economics.
Decision guide — when to use which
Use Air source heat pump when…

New builds, well-insulated homes, off-grid properties, homes eligible for the £7,500 Boiler Upgrade Scheme.

Use Gas boiler when…

Existing poorly-insulated homes, quick boiler replacement, where gas network access and prices remain favourable.

📊 Side-by-side comparison
Aspect Air source heat pump Gas boiler
Energy source Electricity (200-400% efficient) Gas (90% efficient)
UK running cost Depends on COP and electricity rate Typically cheaper at 2026 energy prices
Installation cost £8,000-15,000 £2,000-3,500
Grant available £7,500 Boiler Upgrade Scheme None
Carbon output Low (with green electricity) Higher (burning fossil fuel)

Frequently asked

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Is a heat pump worth it in 2026?

For new builds and well-insulated homes with the £7,500 grant: often yes. For typical older semi-detached houses without good insulation: the COP drops and running costs may not beat gas. Get a professional heat loss calculation before committing.

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What COP does a heat pump need to beat gas?

As an illustration, with electricity at 24p/kWh and gas at 7p/kWh (check current price-cap rates), you need COP above 24/7 = 3.43 to beat gas on running costs. Modern heat pumps achieve COP 2.5-4 depending on outside temperature — they're less efficient in cold weather.

Reviewed for 2026. This comparison is general guidance based on publicly available information. Prices, rates, rules and specifications change, so check current details with the provider or an official source before making a decision. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project. We don't sell SEO links or accept paid placements in this content.

Frequently asked questions

Is a heat pump worth it in 2026?

For new builds and well-insulated homes with the £7,500 grant: often yes. For typical older semi-detached houses without good insulation: the COP drops and running costs may not beat gas. Get a professional heat loss calculation before committing.

What COP does a heat pump need to beat gas?

As an illustration, with electricity at 24p/kWh and gas at 7p/kWh (check current price-cap rates), you need COP above 24/7 = 3.43 to beat gas on running costs. Modern heat pumps achieve COP 2.5-4 depending on outside temperature — they're less efficient in cold weather.