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Correct placement of circulator pump

JBB
JBB Member Posts: 16
in Radiant Heating

Hello, I have a question regarding the placement of a Taco circulator pump. Mine is a radiant underfloor system using a 40 gallon gas water heater as the heat source. I had to replace it, and the pump, they were both over 10 yrs old. The flow direction is IN at the water heater drain, and OUT at the hot side of the top of the wh. Should this be piped out at the bottom, and in at the wh top? This is a closed system, with an expansion tank on the wh top cold pipe. JB

Thanks for the help!

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 26,410

    Direction of flow through the tank isn't that critical — it's forced flow, so having the hot outlet at the top isn't that important.

    What IS important is where the expansion tank is relative to the circulator: the expansion tank should be connected a foot or two upstream of the INLET to the circulator.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • JBB
    JBB Member Posts: 16

    Thanks; So the expansion tank should never be instaĺled on the cold water inlet side of the water heater at all?

  • hot_rod
    hot_rod Member Posts: 25,721

    is the water heater supplying hot water fir the building ? Or is it dedicated to the radiant?

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • JBB
    JBB Member Posts: 16

    supplying hot water to the radiant underfloor system only

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