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Thread: Simple Variable vs 2 speed pump question

  1. Back To Top    #1

    Join Date
    Oct 2015
    Location
    Phx, AZ
    Posts
    22

    Simple Variable vs 2 speed pump question

    I have a quick question on Variable vs 2-speed. I currently have a whisperflow pump WFE-6(with a rather oversized 1.5/1.47 SF = 2.2HP motor on it for my pool) and am looking to either jump into a Variable or 2-speed replacement (modestly sized for my smaller pool).

    I have two motors I am looking at:

    2-speed 1HP/1.65SF = 1.65HP A.O. Smith Pool Motor Square Flange 1 HP Full Rate Dual Speed w/ Digital Controller (B2982T) - INYOPools.com
    $340

    Variable speed 1HP/1.65SF = 1.65HP A.O. Smith 1.65 HP Variable Speed Pool Pump Motor Square Flange - ECM16SQU - INYOPools.com
    $399

    Both are AO Smith Motors, both same specs HP wise, They will be placed into a pump that is obviously made for a larger motor (so no problems with impeller replacement to size up).

    I have always been under the impression that Variable speed is significantly more expensive, yet not so much the case here. Am I missing something? I know that appropriate surge protection is needed for variable morethan 2speed/singles, but everywhere I am reading thus-far states that Variable pumps take significantly longer to make-up the cost of them.

    My Power here in phoenix is a rather odd .06/kW from 1900-1200 and .24/kW from 1200-1900 so having the ability to really slow down the pump to 1-200 watts during peak time will save a ton. As it stands right now I simply run the pump on offpeak power time.

    Any & all thoughts are appreciated. Seems strange to "only" see a roughly $60 in price diff from 2-speed to variable.
    11,500 gal IG Plaster finish, CCP420 Cartridge, Superflo 1.5 VS , Swimpure+ / T-15 SWCG, KreepyKrawly, TF-100.

  2. Back To Top    #2

    Re: Simple Variable vs 2 speed pump question

    You can get a whole variable speed pump for $550.00. By the time you buy a new impeller and seal kit, you're not that far from that. If the pump is old, the seal plate is likely to be bad. That's another $60.00. I would consider going whole new pump.

  3. Back To Top    #3

    Join Date
    Oct 2015
    Location
    Phx, AZ
    Posts
    22

    Re: Simple Variable vs 2 speed pump question

    Being that I am dropping from the current pump of 2.2HP to a 1.6 HP either 2-speed or variable, would I need to install a new impeller?. My pump itself is less than 10 years old w/ original motor still working fine. I am just trying to save money.

    I have been lurking around for the past two months and see a motor replacement (to a 2-speed) as a frequent recommendation for saving money. Have not seen someone retrofit a variable speed motor onto a pump though.

    Thank you for your advice. I appreciate it and will be the first to admit I am rather new to this.
    11,500 gal IG Plaster finish, CCP420 Cartridge, Superflo 1.5 VS , Swimpure+ / T-15 SWCG, KreepyKrawly, TF-100.

  4. Back To Top    #4
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,478

    Re: Simple Variable vs 2 speed pump question

    Being that I am dropping from the current pump of 2.2HP to a 1.6 HP either 2-speed or variable, would I need to install a new impeller?
    Yes if those are THP ratings.

    My pump itself is less than 10 years old w/ original motor still working fine. I am just trying to save money.
    You might want to price out a motor + impeller against a new pump because sometimes it isn't much different.

    But one thing I would not do is go with a retrofit VS. There have been an number of issues reported on the forums regarding those.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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