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Hot Water to Steam

I have a house that appears to have been originnaly a steam system that was converted to HW (two pipe). I am contemplating reverting to steam. However the risers are 1 to 1 1/4". Home is three stories, seems like most radiators are on home runs to horizontal 4" main in basement. Can someone advise if risers are appropriately sized?


  • Steamhead
    Steamhead Member Posts: 16,832
    That would depend

    on the radiation load the risers must handle. If the rads have not been changed, you should be OK.

    But that may also have been a gravity hot-water system. If the mains and risers pitch up from the boiler, and they're the same size supply and return, it was a gravity HW system. If the return is smaller than the supply (applies to mains and risers) it was steam.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
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