*These are estimated figures based on installing a new A-rated condesing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) in a gas-heated home from an older boiler with a programmer and room thermostat. Savings will vary depending on the size and thermal performance of your home. Figures are based on fuel prices as of April 2022. The costs for replacing a boiler will vary, but straightforward gas boiler replacement plus thermostatic radiator valves will typically cost about £2,500 excluding radiators.