BoilerFaultCodes Free sizing quiz
What boiler do I need?
Getting the right type and size matters — a too-small combi can't keep up with two showers; a too-big one wastes gas. Answer five quick questions below.
Our recommendation
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One caveat
This quiz gets you 90% of the way. For the final decision, an installer will do a heat-loss calculation on your actual home — they account for insulation, windows, and radiator placement that a questionnaire can't. Use this result to walk into the conversation informed.