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Thread: Variable speed pumps on smaller pool with spa

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    Join Date
    Mar 2014
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    Orange County, CA
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    Variable speed pumps on smaller pool with spa

    I have single speed 2HP pump motor on my 11k gallon pool and spa. I'm new to pools and we bought this house with the pool last September. My current pump works fine (although it's very loud) but I've been running it less than 2hrs a day during winter and the water has been clear.

    Now that the summer is coming, I'm worried that I'll need to run it much longer (6hrs). With $.30/kwh energy costs, I'm considering replacing my pump with a Intelliflo VS. The pool store is offering a free install for ~$1000 after rebate.

    So my question is: is my 2HP pump too big? Is replacing it with a VS pump worth it on a small pool?
    11k gal IG concrete pool with spa, WhisperFlo WFE-4 pump with 2HP motor, Pentair DE filter

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Variable speed pumps on smaller pool with spa

    A 2 HP pump is too big for the pool, but probably just right for the spa. That is a nice thing about variable speed pumps, they can be adjusted to be just the right "size" for every situation.

    With electrical rates around $0.30/kWh, a variable speed pump is a good investment that will save you a fair amount of money in the long run, especially with a rebate.
    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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    Mar 2014
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    Re: Variable speed pumps on smaller pool with spa

    Thanks for the quick response. I will likely go ahead with the new VS pump. Would a cheaper option be to keep the current pump and just replace the motor with a dual speed motor? The pump part is a 1HP WhisperFlow WFE-4 but I'm not sure how to find out what motors are compatible.
    11k gal IG concrete pool with spa, WhisperFlo WFE-4 pump with 2HP motor, Pentair DE filter

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Variable speed pumps on smaller pool with spa

    A two speed motor will cost less up front, but longer term will end up costing more (given your electrical rates and some standard assumptions).
    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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