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Thread: Efficient Pool Pump - 24hr use low flow

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    Efficient Pool Pump - 24hr use low flow

    Does anyone have a recommendation for an efficient pool pump. I want to run it 24 hrs (to ensure the heater and heat pump can operate) but in order to keep costs down am trying to approximate 1 turn per day and thus need about 10GPM. I have been told that the Pentair Intellitouch while very efficient is not efficient at this low flow rate. Any help would be appreciated.
    Sean

    15 x 30 gunite pool with Riverflow Professional 12miles per hour flow (10HP silent ABB pump) to make the entire pool flow - Pentair Intellitouch i10 - Heat pump AquaComfort 110 - Raypak 399k Digital Gas Heater - Pool Pilot Digital SC-48 - Pentair FNS Plus 60 - Polaris 3900 Sport Cleaner on booster pump
    2 x Pentair Intelliflo pumps - one for filter (VF) and second for Venturi Pool Jets (VS) and Jandy 6 set deckjets - Pentair PG2000 Fiberoptic lighting - Automatic PoolCover (Brown) by Pool Cover Specialists

    Winter Pool Bubble by Ameri-Dome

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    JasonLion's Avatar
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    Take a look at the Pentair WhisperFlo WFDS-3 3/4 HP dual speed. On low speed it is about the size you were talking about and you have the option of turning it up to high speed should you need more flow.
    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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    mas985's Avatar
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    Re: Efficient Pool Pump - 24hr use low flow

    Quote Originally Posted by ewsb
    Does anyone have a recommendation for an efficient pool pump. I want to run it 24 hrs (to ensure the heater and heat pump can operate) but in order to keep costs down am trying to approximate 1 turn per day and thus need about 10GPM. I have been told that the Pentair Intellitouch while very efficient is not efficient at this low flow rate. Any help would be appreciated.
    First, it is unlikely that any heater or heat pump will operate at 10 GPM since they generally require much higher flow rates (20-40 GPM). I would double check the specs on your heat pump.

    Second, I don't think there is a pool pump on the market that will efficiently run at 10 GPM although the Intelliflo would be your best option but depending on your plumbing, 10 GPM may not be possible. Someone on this site did say they got one to run down at 15 GPM but that is the lowest I have heard of.

    At very low RPM, there is diminishing returns so running at 20 GPM may cost about the same as 15 GPM so you might as well run at 20 GPM. The Intelliflo peak efficiency is about 1000 RPM at about 170 watts and flow rates will be between 25-45 GPM depending on the plumbing. 400 RPM runs at about 100 watts and flow rates will be between 10-20 GPM which is still pretty good but not as good as 1000 RPM (more than twice the flow rate for less than twice the power).
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Minimum flow for HEat Pump

    Many thanks - you are correct the minimum flow if 20 GPM - maybe I will look at the 2 speed Whisperflo?
    Sean

    15 x 30 gunite pool with Riverflow Professional 12miles per hour flow (10HP silent ABB pump) to make the entire pool flow - Pentair Intellitouch i10 - Heat pump AquaComfort 110 - Raypak 399k Digital Gas Heater - Pool Pilot Digital SC-48 - Pentair FNS Plus 60 - Polaris 3900 Sport Cleaner on booster pump
    2 x Pentair Intelliflo pumps - one for filter (VF) and second for Venturi Pool Jets (VS) and Jandy 6 set deckjets - Pentair PG2000 Fiberoptic lighting - Automatic PoolCover (Brown) by Pool Cover Specialists

    Winter Pool Bubble by Ameri-Dome

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    mas985's Avatar
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    The two speed 3/4 HP Whisperflo is likely to be between 25-40 GPM on low speed and run close to 500 watts. So it won't be as efficient as the Intelliflo but it will cost a lot less.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    JasonLion's Avatar
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    I was under the impression that the efficiency of the IntelliFlo dropped off dramatically at the lowest speeds. Rereading this thread more carefully it looks like I was wrong. It isn't a question of the speed, rather it is a question of where you fall on the head curve.

    So the only limitation is that the IntelliFlo won't go as slowly as required to get down to the 10 GPM rate desired in this siutation. The WhisperFlo I suggested is just about the smallest pump you can get for this application, yet I now see that the IntelliFlo's lowest speed is lower power still. In theory you could get an even smaller pump and adapt it somehow, though 600 GPH pumps are normally setup for 1/2" or 3/4" pipe and won't have any hope of priming a system above water level.
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    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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    Thanks - great input - I think I will go with intelliflo
    Sean

    15 x 30 gunite pool with Riverflow Professional 12miles per hour flow (10HP silent ABB pump) to make the entire pool flow - Pentair Intellitouch i10 - Heat pump AquaComfort 110 - Raypak 399k Digital Gas Heater - Pool Pilot Digital SC-48 - Pentair FNS Plus 60 - Polaris 3900 Sport Cleaner on booster pump
    2 x Pentair Intelliflo pumps - one for filter (VF) and second for Venturi Pool Jets (VS) and Jandy 6 set deckjets - Pentair PG2000 Fiberoptic lighting - Automatic PoolCover (Brown) by Pool Cover Specialists

    Winter Pool Bubble by Ameri-Dome

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    Quote Originally Posted by ewsb
    Thanks - great input - I think I will go with intelliflo
    Good choice. One thing you may find is that extended low-speed filtration isn't very good for surface skimming. I find it useful to run my 4x160 at around 2500 rpm for 45-60 minutes once per day. This helps a great deal in getting all the floating junk our of my pool.
    ~13500 gallon gunite pool, Pentair Intelliflo 4x160, Pentair 520 SF cartridge filter, Pentair MasterTemp 400 NG heater
    Pentair Easytouch with IC40 SWCG, Hayward Navigator on dedicated suction line

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    Thanks - good point - As I have to the pool cover on most of the time - when not is use - that helps.
    Sean

    15 x 30 gunite pool with Riverflow Professional 12miles per hour flow (10HP silent ABB pump) to make the entire pool flow - Pentair Intellitouch i10 - Heat pump AquaComfort 110 - Raypak 399k Digital Gas Heater - Pool Pilot Digital SC-48 - Pentair FNS Plus 60 - Polaris 3900 Sport Cleaner on booster pump
    2 x Pentair Intelliflo pumps - one for filter (VF) and second for Venturi Pool Jets (VS) and Jandy 6 set deckjets - Pentair PG2000 Fiberoptic lighting - Automatic PoolCover (Brown) by Pool Cover Specialists

    Winter Pool Bubble by Ameri-Dome

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