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Thread: Can you run 1.5HP pump with 1HP impeller?

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    Can you run 1.5HP pump with 1HP impeller?

    Will anything bad happen running a 1.0hp impeller on a 1.5hp motor? Will this indeed slow the flow?

    I had to replace the original 1.0hp motor this year and after some research thought a 1.5hp would be better. It was suggested here that the 1.5hp would have several cons and really no pros verse running the same as original 1.0hp. It's a 25K gal IG with 1.5" piping and Hayward S240 sand filter.

    I talked to the vendor about an exchange of my 1.5hp to a 1.0 and his suggestion was to run the 1.0hp impeller which would slow the flow. And, in doing so the motor would actually not be working as hard.

    My main concern is filter effectiveness. I've been running the pump 24/7 for the last several years (summers only) and will have a timer installed this year. I think even if the 1.5 does use a little more electricity, running less than half the time will net a reduction in costs.

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    Mod Squad Bama Rambler's Avatar
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    Re: Can you run 1.5HP pump with 1HP impeller?

    Putting a 1 hp impeller on a 1½ hp motor essentially makes it a 1 hp pump. The motor will draw alomst the same current as a 1 hp motor and the flow will match a 1 hp pump.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Can you run 1.5HP pump with 1HP impeller?

    Thanks!

    I put the 1hp impeller on the new pump last night and all is good. Flow is definitely more controlled, it was really moving with the other impeller.

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    Re: Can you run 1.5HP pump with 1HP impeller?

    Question - how difficult would this be on a Pentair Superflo (doing the 1HP impeller swap) ?
    16x32 IG 19,000 gallons, Pentair 1.5 hp Energy Efficient Superflo pump (348024),vinyl liner, Chlorine dispenser, Hayward S-244T sand filter

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    mas985's Avatar
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    Re: Can you run 1.5HP pump with 1HP impeller?

    It shouldn't be difficult to do on any pump unless you can't remove the wet end because of rusted screws. But even that can be solved with a little extra work.
    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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    Re: Can you run 1.5HP pump with 1HP impeller?

    It can be done on the SuperFlo. The 1 H.P uses a different diffuser than the 1.5 H.P, so you would need to change that as well.

    http://www.pentairpool.com/pool-pro/par ... mp-193.htm

    Also, note that you can't use a larger impeller on a smaller motor. E.g. you can't change a 1 H.P impeller to a 1.5 H.P impeller on a 1 H.P pump.

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    Re: Can you run 1.5HP pump with 1HP impeller?

    Considering the cost of parts on that is around $100 - I think I'll pass. I have an old (low hours) Hayward PowerFlo II 3/4 hp that I just got a strainer assembly for if I really want to try a smaller pump
    16x32 IG 19,000 gallons, Pentair 1.5 hp Energy Efficient Superflo pump (348024),vinyl liner, Chlorine dispenser, Hayward S-244T sand filter

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