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Draining a forced hot water zone........

Lil-Roc Member Posts: 50
How do you get a steam system to do hot water on the third floor and have steam below it? I have seen it where the hot water side is below the boiler using the condensate return like for a basement but this doesn't sound right. The only way I could think of is a that you must have a separate heat exchanger correct?


  • Carol_9
    Carol_9 Member Posts: 19

    I have 2 zoned heat, one zone is steam heat and the other is forced hot water. I would like shut off the forced hot water zone this winter as it's on the 3rd floor of the house which is not really used. Do I have to drain the system so it doesn't freeze or can I just shut it off? If I have to drain it is there anything else I need to do on top of that?
  • Timco
    Timco Member Posts: 3,040

    If you suspect it will freeze in the area to be left off, it must be drained. Old rads & circulators & other parts do not like to be dry, so leave water in the loop if possible.

    Just a guy running some pipes.
  • Hvacman
    Hvacman Member Posts: 159

    FHW off DHW coil in steamer... My house had been done like that, my cats like it better now that I'm all FHW... they can sleep on the rads now!
  • Carol_9
    Carol_9 Member Posts: 19

    They ran forced hot water baseboards for the 3rd floor off the bottom of the boiler. I'm not a heat person so I don't know the specifics of it, but any heat guy that has seen thought it was clever the way it was done.
  • Carol_9
    Carol_9 Member Posts: 19

    Tim, what do you mean by "leave water in the loop if possible"? What is "the loop"?
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