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Thread: VS with larger motor

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    VS with larger motor

    I have been reading about the potential energy savings of a variable speed pump. My electric utility offers a $200 rebate, so that would help offset the cost.

    My question is in how much that energy savings would be offset by the VSP being a larger pump? My current pump is a Pentair WhisperFlo WF-23, 3/4 horsepower pump, with a service factor of 1.27.

    The Pentair IntelliFlo Variable Speed is a 3 HP pump. Will the much larger motor offset any savings I would have gotten? Pentair doesn't seem to have a variable speed 3/4 or 1 HP pump.

    Glen

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    Mod Squad jblizzle's Avatar
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    Re: VS with larger motor

    Welcome to TFP!!!

    Almost 5 years and finally posting

    You could save money with the larger VS pump ... assuming you run it at a speed slow enough to lower your flow rate. But there are certainly smaller VS pumps that might make more sense ... even with a rebate, a 2-speed motor or pump might make more sense.

    If you give us more information we will be able to offer suggestions.

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    JasonLion's Avatar
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    Re: VS with larger motor

    It turns out that larger VS pumps are more energy efficient than smaller ones, even at fairly low flow rates, despite the higher HP rating, actually because of the higher HP rating. However, they also cost a lot more up front. Depending on your electrical rates you may well never save enough to pay back the larger up front investment. For that matter, in most areas it is more economical to get a two speed pump instead of a VS pump.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: VS with larger motor

    Thanks for the replies.

    I haven't posted in 5 years, because I can usually find whatever information I'm looking for by searching these forums. It's a wealth of great information.

    I've updated my sig and profile. I'm in the Philadelphia, PA area.

    What are some smaller VS pumps that are worth considering?
    26,000 gal, IG, vinyl, DE Pentair FNS Plus36, Hayward SP2302VSP Max-Flo VS Pump, Pentair IntelliChlor IC40 SWG , Installed 2006

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    Patrick_B's Avatar
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    Re: VS with larger motor

    Quote Originally Posted by glenwill View Post
    Thanks for the replies.

    I haven't posted in 5 years, because I can usually find whatever information I'm looking for by searching these forums. It's a wealth of great information.

    I've updated my sig and profile. I'm in the Philadelphia, PA area.

    What are some smaller VS pumps that are worth considering?
    That is great to hear Glen. Since you are here officially, Welcome to TFP!
    TFP Moderator
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    JasonLion's Avatar
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    Re: VS with larger motor

    The MaxFlo VS is a good small VS pump to look at. As I mentioned previously, you will probably be better off by total lifetime cost with a two speed pump.
    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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    Re: VS with larger motor

    Quote Originally Posted by JasonLion View Post
    The MaxFlo VS is a good small VS pump to look at. As I mentioned previously, you will probably be better off by total lifetime cost with a two speed pump.
    Thanks Jason. What 2-speed pumps would be worth looking at?

    When I look on Amazon, I see 2-speed pumps running for $400-$700, and variable speed for $700-$800. It seems that after the $200 rebate, I'll be paying a similar price for a variable speed. Are there cheaper 2-speed pumps that will work for an in-ground pool?

    For 2-speed, I see the Hayward SP3210EE, which is $529, and the Jandy FHPM 2.0 FloPro which is $369

    For VS, I see the Hayward SP2302VSP, which is $648 ($448 after rebate), and the Pentair 011018 IntelliFlo for $877 (677 after rebate)

    The Hayward VS seems to cost about the same as the 2-speeds, after my $200 rebate, which only applies to variable speed pumps.

    I'm not trying to be argumentative, and I'll gladly get the 2-speed if it'll save money. I just want to see if I am missing something about this.
    26,000 gal, IG, vinyl, DE Pentair FNS Plus36, Hayward SP2302VSP Max-Flo VS Pump, Pentair IntelliChlor IC40 SWG , Installed 2006

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    mas985's Avatar
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    Re: VS with larger motor

    You only need to swap the motor on your current pump. Much more cost effective. You can use a B2980 or B2981 depending on 115v or 230v. The best part is you don't have to mess with any plumbing.
    Mark
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    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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    Re: VS with larger motor

    Quote Originally Posted by mas985 View Post
    You only need to swap the motor on your current pump. Much more cost effective. You can use a B2980 or B2981 depending on 115v or 230v. The best part is you don't have to mess with any plumbing.
    Ah, that makes sense. The current pump and motor are 8-9 years old. If I replace just the motor, how long should the pump last? It's a Pentair Whisperflo.
    26,000 gal, IG, vinyl, DE Pentair FNS Plus36, Hayward SP2302VSP Max-Flo VS Pump, Pentair IntelliChlor IC40 SWG , Installed 2006

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    mas985's Avatar
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    Re: VS with larger motor

    Pump housings should last a good long time. There is nothing to wear out. About the only thing that can happen is that they can develop a crack but usually due to an impact event. 8-9 years is not all that long and I would not hesitate to change just the motor.
    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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