Free Tool

Boiler Cost Calculator

Estimate what a new boiler should cost supplied and fitted, by boiler type and job type — then add the extras installers often quote separately.

Boiler type

Job type

Magnetic filter — adds £110–£310 (supply £60–£160 + fitting £50–£150) Smart / wireless heating controls — adds around £150

Estimated installed cost

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Figures used: like-for-like combi £2,500–£4,000 (average around £3,000); system and regular replacements average around £3,000, within a £2,500–£4,100 market range; changing boiler type averages around £4,000. Supply-only averages around £1,500 with installation typically adding £1,000–£2,000. These are guide ranges from UK cost guides, not quotes — always compare two or three itemised written quotes, and confirm the installer is Gas Safe registered.