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Thread: 3/4HP or 1HP?

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    Join Date
    Jul 2014
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    3/4HP or 1HP?

    I'm looking to get a new Hayward super pump. I'm not sure if I should go 3/4 or 1 HP. Hopefully you pros can help me out.

    My pool is 10,000 gallons in ground. Hayward DE36 pro grid filter, Hayward gas heater 350btu.
    The run from the skimmer is about 36ft and from the drain 54ft. The plumbing is 1.5" in the ground and 2" between the equipment.

    The old pump is 3/4HP Hayward super. When it was installed (by previous owner) there was no heater. I thought it did the job but I never got to run it with the heater. I'm wondering if adding a heater will make that much of a difference in my pump needs.

    FYI, when I was running the 3/4 HP pump the reading on the filter's gauge after backwash was around 10psi.
    Last edited by SteinwayD; 06-27-2016 at 09:03 AM. Reason: Make clearer

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    Mod Squad JVTrain's Avatar
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    Re: 3/4HP or 1HP?

    A 3/4 pump is plenty for your pool from the sounds of it. Heaters require a minimum flow to operate, but the limit is fairly low and will be fine with that pump.

    Is the current pump going bad or are you just looking for reassurance that it will work fine with the heater?

    Also, adding the details of your pool to your signature helps us understand your situation and questions better. You can add that here: Edit Signature
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: 3/4HP or 1HP?

    Thanks for the link. I was wondering how you guys did that. Apparently I need to be on a desktop to add that info. Maybe my grandma has one, ha. There should be a TFP app.

    I bought a 3/4HP. Old one was leaking. Replaced everything, still leaking. I'm sure it can be fixed but if I didn't get my pool working in the next few days I will go insane. I'll take it apart and try again some day and then just keep it as a back up.

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    Mod Squad pooldv's Avatar
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    Re: 3/4HP or 1HP?

    Ha! Just open TFP in a browser on your device, works great.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: 3/4HP or 1HP?

    Not if you want to edit your signature.

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    Re: 3/4HP or 1HP?

    Are you going with a 2 speed pump?

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    Mod Squad pooldv's Avatar
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    Re: 3/4HP or 1HP?

    Quote Originally Posted by SteinwayD View Post
    Not if you want to edit your signature.
    Yes, it does. You might need to switch to desktop view.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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