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Free boiler tools

Interactive calculators for UK homeowners. No signup, no email, no "we'll send you quotes". Just instant answers.

Boiler replacement cost calculator

Instant estimate in under a minute — boiler type, brand tier, property size, install complexity, region.

Find the right type (combi, system, regular) and output (kW) for your property. Example models included.

See how much extra your current boiler costs per year vs a modern A-rated replacement. Includes 5/10/15-year projections.

We've got 18 plain-English guides on fault diagnosis, buying advice, and maintenance — all free.