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Thread: circ pump location

  1. #1

    Default circ pump location

    Hallo -

    I'm doing a job where the circ pumps on a hydronic system are located on the return manifold "pulling" water through the loop rather than "pushing" on the heating supply manifold. I just have never seen it done that way and am curious if that an accepted practice.

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default pumps

    I am not sure how common it is now, but in the 50's and 60's it was almost always done that way.

  3. #3
    In the Trades Bob NH's Avatar
    Join Date
    Oct 2005
    New Hampshire


    In a closed pressurized system the concept of "pushing" of "pulling" the water doesn't apply.

    The return water is cooler and you are less likely to get cavitation in the pump if you are pumping the return water. That is significant with smaller high speed pumps that are used now. Also, the air vent is usually on the discharge end of the boiler which minimizes the air that will get to the circulator pump.

  4. #4


    thanks ... I can see your points..... why are most systems set up with the pump on the supply side?
    thanks again


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