In 40 seconds
Most UK homes need a 24–35 kW condensing combi boiler, which costs £1,500–£3,500 supply and fit in 2026. The right size depends on your number of radiators and bathrooms; the right type — combi, system or regular — depends on your home’s hot-water demand. All gas boiler work must be carried out by a Gas Safe registered engineer. If you are on a qualifying benefit, the ECO4 scheme may fund part or all of the cost; the Boiler Upgrade Scheme offers £7,500 toward a heat pump instead. Get at least three itemised quotes, check Gas Safe registration at gassaferegister.co.uk, and always receive a Benchmark Commissioning Checklist and Gas Safe certificate on completion.