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National boiler info

I am replacing a No 1 Series Heat Extractor, oil-fired boiler made by National Radiator Company. It doesn't have BTU input or output ratings, only "sq. ft. water" ratings. Do these convert into BTU/hr?


  • Danny Scully
    Danny Scully Member Posts: 1,407
    edited December 2018
    None of that matters. You need to do a proper heat loss (if it’s hot water) or an edr survey (if it’s steam).
  • skmillersr
    skmillersr Member Posts: 2
  • Steamhead
    Steamhead Member Posts: 16,268
    Many if not all of those Heat Extractors had asbestos insulation. You'll need a proper asbestos contractor to deal with this.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    EBEBRATT-Ed Member Posts: 13,817
    Water is 150 btu/square foot, steam is 240btu/square foot