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Creating a radiant loop off a steam boiler

EMC PLUMBING Member Posts: 22
running radiant zone off a steam boiler using a heat exchange ANY SUGGESTIONS.recently did this off a oil fired steam boiler for a new kitchen addition on an old house. used a taco brazed plate heat exchange. just looking for some insite this is the first time doing a radiant zone off a steam boiler(used in line y strainer on feed from steam boiler in to exchanger before circulator)and then basically treated exchanger like a boiler.
thanks eddie


  • Unknown
    Be carefull how you pipe the strainer

    If you pipe it such that the strainer restricts ALL of the water feeding the pump, the pump suction will go into negative pressure, and at steaming temperatures, that pump will be thrashing and crashing vapor and water together. That's not good. The pump will be trashed before the strainer plugs the first time.

    Look at this...


  • Ken_40
    Ken_40 Member Posts: 1,320
    Does the existing boiler...

    Have a tankless coil in it? Or, does it have a hole for one - that is "capped"? If so, you're in luck.

    Tankless coils can easily run over 100,000 BTU's of load, and by simple bypass piping, can provide low temperature water (radiant) output.

    If there is no opening in the boiler for a coil, there's little else you can do besides what you already have planned. The devil being in how you break into the existing near boiler piping, and boiler block to make the sub-system functional.

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