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Thread: Pump sizing

  1. Back To Top    #1

    Join Date
    Jul 2010
    Reno, Nevada

    Pump sizing

    I currently have a 25,000-gallon IG pool with a WhisperFlo WFE3 .75 HP pump installed in an underground vault about 4 feet below water level - although I just noticed that when the impeller was replaced on the pump 7 years ago, the repairman used a .5 HP impeller. So I'm probably only getting the .5 HP flow rate. First question: Do I have the right-sized pump for my pool? The pool has a single main drain, 2 skimmers, and 4 returns. Couldn't find a pump sizing tool online.
    Second question: I'm thinking of adding a roof-mounted solar heating system for the pool. Will this require a new, larger pump?
    25K gal gunite pool with Auto Cover and Meyco mesh winter cover. Pump and filter in underground vault below level of returns. New Pebble Fina plaster in 7/2010.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Pump sizing

    That is a very reasonable pump for that pool. I have a WFE-2 on a slightly smaller pool and only need to run it five or six hours a day.

    That pump will be fine for most solar systems, though it won't be enough for an especially high roof.
    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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