Heat Pumps vs Gas Boilers: Which is Best?
Heat pumps and gas boilers both aim to warm your home and water, but they differ significantly in methodology, cost and environmental impact. Heat pumps run on electricity and offer a low-carbon route to heating, while gas boilers burn natural gas for fast, powerful warmth. Here's how the two stack up across the factors that matter most.
How Each System Works
Heat pumps extract thermal energy from the air (air source) or ground (ground source) and transfer it indoors, running entirely on electricity as a low-carbon heating solution. Gas boilers combust natural gas to generate heat, which is fast and efficient but releases carbon dioxide and emissions that contribute to climate change.
Energy Source: Which Is Greener?
Gas boilers burn natural gas, a fossil fuel, emitting high levels of carbon dioxide and other pollutants. Heat pumps use electricity that can potentially be powered by renewables, making them a significantly greener choice.
Efficiency: Which Works Best?
Heat pumps run at 300-400% efficiency, delivering 3-4 units of heat for every 1 unit of electricity, and provide gentle, consistent warmth at 35-55°C. Gas boilers are 90-95% efficient, losing 5-10% as waste heat, but deliver quick, powerful heat at 70-80°C.
Running Costs and Lifespan
Heat pumps are generally more cost-effective to run than boilers, especially on renewable tariffs or in well-insulated homes, while gas boiler costs vary with market gas prices and tariff type. Heat pumps also last longer at 15-20+ years with lower maintenance and fewer moving parts, versus 10-15 years for gas boilers, which need regular servicing.
Installation Cost and Grants
Gas boiler installation runs £2,000-£4,000, while an air source heat pump costs £8,000-£18,000 before grants. With the UK's £7,500 Boiler Upgrade Scheme, heat pumps come down to roughly £3,500-£6,000, approaching high-end boiler pricing, though boilers have fewer subsidies available.
Which Should You Choose?
The right system depends on your living situation and priorities. Poorly insulated homes may need a gas boiler for rapid, high-heat output, while well-insulated or new-build properties suit a heat pump's steady, consistent warmth. Environmental concerns favour heat pumps, and installation simplicity favours boilers - consult heating specialists for property-specific guidance.
