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Thread: Adding LP heater to existing Heat Pump???

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    Adding LP heater to existing Heat Pump???

    I have a large pool (80,000 gal) which is in a rental property, as a result the heaters (3 of them!) are off most of the time.
    When we have a booking, say once a month, we fire up the heaters and it can take 3-4 days to get up to 85-88!!

    If the air temp is low, or it rains we do not even achieve that!

    Question: Could I add a LP heater to the row of heat pumps (should it go first or last??) to give that initial boost for heat then allow the HP to keep it there??
    Perhaps let the gas heater kick in occasionally when needed??

    Any thoughts!


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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Adding LP heater to existing Heat Pump???

    I would pick the most convenient location for the heater. It doesn't make a big difference where in relation to the others it is in the plumbing circuit as far as efficiency goes.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Join Date
    Dec 2009
    Central Massachusetts

    Re: Adding LP heater to existing Heat Pump???

    I'd put the LP heater last. If you do that, you can let the heat pumps take care of most of the heating for the pool. That way, the LP heater is measuring the temp of the water heated by the heat pumps. For example, if your water temp is 85 degrees and your LP heater is set for 86, it wont kick on unless the heat pumps cant keep up.

    FWIW, I'm going to add an LP heater in the spring. My heat pump is pretty useless April through mid may and late august through mid october. i know what you mean about the rain, too. Even if it's 65 degrees, if it's raining, all it does is spin the electric meter. i like my heat pump under certain conditions, but they do not do what the sales people say they will do outside of maybe florida or the deep south.
    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.

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    dmanb2b's Avatar
    Join Date
    Apr 2009

    Re: Adding LP heater to existing Heat Pump???

    We have decided to move the discussion that previously followed in the deep end section of the forum, for purposes of not getting off topic. bk406's answer, sufficiently answers the OP's question. In net, yes a gas heater can be added to your system and although placement is not completely crucial, to be safe it should be plumbeb in parallel or if plumbing in series is your only option, the gas heater should be placed last in series.

    The debate as to whether the heater can cause damage to heat pumps if placed first in series, can continue in the deep end topic here

    Since the OP's question has been answered, this thread will continue to remain locked, as it has run it's course.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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