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Replacing a steam boiler

So I went to this house who’s steam heating boiler cracked and They want me to replace it. I went to the apartment and starting to right the height and sections of the radiators to determine my btu output, but in total I’m getting 54,000 btu when I add all my sqr. Ft. EDR and 1.5 factor now Im stuck on what to do next can someone please help me understand this a bit better 


    EBEBRATT-Ed Member Posts: 15,529
    Measure every radiator height x width & number of sections etc and add the total for all rads and get your total EDR

    Let's say your total EDR is 400. Then just pick a boiler that will heat 400 EDR off the boiler rating plate. The boiler efficiency and the piping and pick up factor of 1.33 is already calculated in by the boiler mFG. You don't need to do anything else. you don't need to calculate btus or anything

    The only reason to deviate is if the steam piping is uninsulated or poorly insulated then some recommend increasing the pick up factor from 1.33 to 1.50. dont forget the 1.33 is already figured in