Sizing a new boiler.

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    • #274657

      I need a new boiler.

      I have 18 average sized radiators, plus hot water for a family of 5.

      Approximately how many BTU’s should my boiler be?

      Many Thanks

      John Harrison

    • #290111

      It should be sized big enough for the AVERAGE coldest day figuring the AVERAGE amount of insulation using the AVERAGE sized piping

      Based on the AVERAGE sized circulator Also considering the AVERAGE height of the ceiling and AVERAGE heat losses based on AVERAGE window sizes.

      Most importantly the AVERAGE temperature the AVERAGE person feels comfortable with.

    • #290112

      Sylvan, I think the average guy can understand that answer. For more details he can visit the free hot water design lessons at

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