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Hi Is therea formula for working out what size boiler I nead for the house size, i.e. cubic meter's of room space. thank's Terry

Hi everyone, just found this forum whilst looking for help for my boiler. Anyway yesterday (Xmas day) the boiler went onto lockout mode, I traced the fault back to the fan (it just hummed and was not turning). Not a problem to change but was wandering how much a new fan unit would be, by the...