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size house or radiation

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fwb1375
fwb1375 Member Posts: 7
in THE MAIN WALL
Do you size a house for the heating load  , or do you size the cast iron radiators for hot water heating?

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  • The Steam Whisperer (Formerly Boilerpro)
    The Steam Whisperer (Formerly Boilerpro) Member Posts: 834
    Sizing

    For hot water heat, always size according to heat load.  Also, if you have cast iron radiation and you are not using a low temp boiler, you need to provide temperature protection for the boiler. 

    Boilerpro

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  • CMadatMe
    CMadatMe Member Posts: 3,086
    Heat Loss

    You always size with a heat loss as BoilerPro has stated. You can measure the radiation to see what it's capable output is at a given supply water temp and then use that with the heat loss to find yourself a heating curve. But keep in mind you must also protect that boiler from low return water temps if it is cast iron.

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