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hydronic heat

cool_2 Member Posts: 2
i have a 600k hot water boiler feeding baseboard and fan coils, fan coils have three way valves, at the boiler the low water cut out is connected to the supply with a 1 inch line and the other side of the cut out is connected to the return, i have never seen this before, isn't this wrong and if not why wound you do this?


  • Weezbo
    Weezbo Member Posts: 6,232
    it sounds like a low water cut off.

    in what is called a bypass. and to be really honest it is there to protect the people in the building.
  • cool_2
    cool_2 Member Posts: 2

    doesn't putting in a bypass take away from the capacity of the boiler?
  • jbplumber
    jbplumber Member Posts: 89

    Cool--No a boiler of that size requires a bypass loop to prevent thermal shock, flu gas condsation, and to keep things working as they should.
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