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Thread: Heater Water Connection

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    Heater Water Connection


    I have a new pool being installed with a 1 1/2 HP Hayward pump. I am installing a Hayward HP21104T heat pump myself. My understanding is that the heater belongs after the chlorinator return to the pool. Should the heater be directly after the chlorinator so that the heater feeds the two returns to the pool and the waterfall or is choosing the furthest return into the pool from the skimmer box okay. If I should feed all returns in the pool with heated water then additional piping alterations will need to be done because the tee that splits the returns is connected directly to the chlorinator so there is no room to cut in the heater at that location without modifying all return lines to the pool.

    Any advice is appreciated.


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    Join Date
    Dec 2009
    Central Massachusetts

    Re: Heater Water Connection

    Quote Originally Posted by BrianC

    My understanding is that the heater belongs after the chlorinator return to the pool.
    Thats backwards. The heater goes before the chlorinator, not after. Also, a check valave should be put between the heater and the chlorinator to keep high concentrations of chlorine from backing iinto the heater.

    All returns should carry heated water to the pool, not just one.
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

  3. Back To Top    #3

    Re: Heater Water Connection

    Yes that would seem to make sense. You would not want the concentrated chlorine to travel though the heat pump so I had it backwards.

    Found this pic online that seems like the correct configuration.

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