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Thread: Single or 2 speed pump??

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    Single or 2 speed pump??

    Working with PB now on equipment list on a new build. Pump will be a Pentair Whisperflo 3/4 HP or 1HP, depending on final agreed pool size. Looking like its going to be a 24x12 give or take with a max of 300 sq feet. I will have a Polaris 280 and booster pump as part of the package. There will be a SWCG, and heater (heat pump) as well. Depending on the how much is left in the budget, we would like to add a cascade or rock fountain. PB said it is my decision if I want the 1 or 2 speed pump, but feels that in this case a 1 speed may be fine. His thoughts are this. The Whisperflo 3/4 HP is very efficient pump. Not sure how efficient or non-efficient the 1 HP is compared to the 3/4 HP, but PB feels that we should be able to get away with the 3/4 HP. In the Boston area we pay a flat rate per KW ($.19) as opposed to some states which pay for peak or tiered pricing. Pool is small so turnover runtime is not very long. Our swim season is not year long so the ROI is longer here in New England. Again, the decision is mine, he was just throwing it out there.

    Running a SWCG at a lower pump rate may have benefits, but I know running the heater, which may happen often here, will need a higher pump rate.

    Would I see much greater benefits going with a 2 speed?

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    Mod Squad jblizzle's Avatar
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    Re: Single or 2 speed pump??

    Why a boosted pressure side cleaner? Those are the least efficient since you have to run 2 pumps for the cleaner to work?

    You definitely want a 2-speed pump ... you can run on low all the time for circulation and filtration. I would also suggest the Superflo line of pumps as they are smaller and cheaper to run as well. I would suggest the 2-speed 1HP Superflo. Although the size of your water feature could impact the required size of the pump.

    Even with power that is not very expensive, a 2-speed is likely to save you at least 50% of the electricity to run it.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    BoDarville's Avatar
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    Re: Single or 2 speed pump??

    Quote Originally Posted by rmclain73
    Would I see much greater benefits going with a 2 speed?
    Absolutely. Go with the 2-speed. The cost differential between a single-speed and 2-speed has narrowed considerably over the years. Even with a short swim season, you should achieve payback on the cost differential within one or, at most, two seasons. Plus, the 2-speed will give you some insurance against higher electric rates in the future.

    When it's time to replace my current pump, I'm definitely going with a 2-speed.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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    Re: Single or 2 speed pump??

    I have to agree. A 2 speed will save on energy and at the same time lets you run the pump at low speed for a longer time, keeping everything circulating. If you have a sand filter, a slower flow rate will actually help to better filter the water since it goes slower through the filter.

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    Re: Single or 2 speed pump??

    Not to be ignored is the noise factor. I converted my 1hp (full-rated) WhisperFlo to 2-speed three years ago. It's only 15 feet from the pool behind a wood fence. It was quiet before, but now it's inaudible. I value my rural silence and I would get the 2-speed just for that.
    Current: 28,000G 18'x36' I/G AnthonySylvan Plaster; Waterway 60 sq.ft. DE Filter; 1.0hp x 1.65 SF Two-Speed (B2982) WhisperFlo; 2004-Present
    Previous: 40,000G 20'x40' I/G Koven unlined WWII salvage 5/8" marine steel; Lomart Stainless Sand Filter; 3/4hp Hayward SuperPump; 1946-2003 (managed by me from about 1964)
    Ancient Taylor K-2000, upgraded with Taylor CH, TA, and FAS-DPD, and TFT CYA tests.

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    Re: Single or 2 speed pump??

    Another thing to consider is if your local utility offers a rebate for an energy efficient pump. I live in Massachusetts and they sent me $200 when I built a pool because I used a variable speed pump. A 2 speed would have qualified as well. Check out MassSave.com. Between the rebate and the energy savings I probably paid for the pump in the 1 1/2 seasons I've had it.

    Some other observations as well. Skip the booster and vac routine. Get a robot to clean the pool. They only use maybe 15 cents in electricity to clean the pool, do it by themselves and also clean through a finer filter than your pool uses. Mine is something like 5 microns. The pool is spotless and I don't have to work at it. Also, using a robot means no dirty pool filters which saves on backwashing or cartridge cleaning. This also keeps you from dumping out salt which you will need to replace after you lower the salt concentration by backwashing and refilling. Saves on stabilizer as well. Make sure you are getting all Pentair equipment too. That will automatically give you a 3 year warranty. Many PB's won't mention this but buying 3 pieces of equipment from the same manufacturer (pump, filter, heater, SWCG qualify) gets you that bump in coverage.
    DIY 28x38x18 Full L, 26,000 gallons, Pentair VS Pump, SWG, CCP 420 Filter, Sta-Rite Max-E-Therm SR400HD Heater, EasyTouch Controller

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    Re: Single or 2 speed pump??

    Just another confirmation for the 2-speed pump. Skip the Polaris and booster pump and get a robot instead for the above reasons. Make sure you check out those rebates, a VS pump might be worthwhile. I had to have at least a 2-speed installed due to CA law, but I wished I got a VS and robot. Believe me, not having to run the pool on high speed to vacuum it is the number one thing I would have changed with my original build.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
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    Re: Single or 2 speed pump??

    I paid $850 for my Intelliflo VS pump and the utility gave me a $200 rebate so for $650 I bought a 3 HP pump that I barely run to keep the SWG working and the heater. It's a no brainer. Ironically, I used the rebate which comes in the form of a debit card to fill the tank of my boat. How green is that!
    DIY 28x38x18 Full L, 26,000 gallons, Pentair VS Pump, SWG, CCP 420 Filter, Sta-Rite Max-E-Therm SR400HD Heater, EasyTouch Controller

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    Mod Squad jblizzle's Avatar
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    Re: Single or 2 speed pump??

    But a 2 speed is still $200 cheaper even after the rebate. And if power costs are not high, you may never save that much more.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Single or 2 speed pump??

    2 speed ... :thumbsup: nothing else to add
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    Re: Single or 2 speed pump??

    I upgraded my pump to a 2 speed motor this year and it was a huge improvement over the single speed. Not only is our electrical usage down significantly but we can barely hear it run. I also contacted Hayward about running the heat with the pump on low speed and they said it was OK to do so. There is a pressure safety switch that needs to be adjusted for the heat to work on low speed.

    The Robotic pool clearer is the only way to go in my opinion. If you can afford it be sure to a model with a remote control. Although the cleaner always cleans every square inch of the pool during the shortest 2 hour cycle there are times I throw it in and use the remote for a quick spot clean.
    20*40 Liner 2'-8' deep, Spill Over SPA, Electric Cover, Jandy Purelink (Aquapure & PDA), Hayward SP2610x15 (1.5HP Single Speed), Hayward H300 (Millavolt)

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