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Thread: Replacing single speed pump with variable speed

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    Replacing single speed pump with variable speed

    My pool pump is dying. It is a Pentair WFE-6, or model #011514, 1 1/2 HP single speed pump. I can replace it with an identical pump for around $550. Is it advisable to step up to a variable speed pump at this time?

    My pool is an in ground pool, about 16,000 gallons.

    We have a solar heater on the roof of the garage, the pump will have to push water up to and through that heater. The highest point of the heater is about 20' above the ground, it is about 130' run of pipe from the pump to the heater. 2" pipe all the way. We have a small waterfall, and in floor pop up cleaning heads.

    What would be the proper variable speed pump to replace the 1 1/2 HP single speed pump?

    Can a variable speed pump handle the extra load of the solar heater and still use less power?

    Something to consider, we use the heater in spring, March, April, and May. Then again in the fall, October, and November. The rest of the year it is not used.

    Thanks for your advice.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Replacing single speed pump with variable speed

    How attractive a variable speed is depends on your electrical rates. If electricity is $0.20/kWh or higher then a variable speed is certainly worth it. Below that, you are probably better off with a two speed.

    For solar, the variable speed will save a little when the solar is on, and way more when the solar is off. The two speed won't really save anything when solar is on.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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