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Thread: 2 Speed vs Variable Speed on 9k Gallon Pool

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    Join Date
    May 2016
    Location
    New Caney, TX
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    23

    Question 2 Speed vs Variable Speed on 9k Gallon Pool

    Hello all,

    I received a quote from a builder to install a 9k Gallon pool, with built in spa. The quote includes a Hayward 2 speed pump, and it would be about $600 to move up to a variable speed. The electric rates here around $.06 pkwh.....does this seem like a worthwhile upgrade to you or should I save that $600 for something else?

    BTW, this is the pool below, it's a fiberglass Viking Pool, Laguna Deluxe model which is 14x30 with a shallow and deep end of 4' and 6'.

    Laguna Deluxe | Flickr - Photo Sharing!

    Thank you

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    Join Date
    Aug 2010
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    Dallas, TX
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    Re: 2 Speed vs Variable Speed on 9k Gallon Pool

    Not worthwhile. Stick with 2 speed.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Join Date
    May 2016
    Location
    New Caney, TX
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    Re: 2 Speed vs Variable Speed on 9k Gallon Pool

    Quote Originally Posted by RobbieH View Post
    Not worthwhile. Stick with 2 speed.
    Is it because of the size of the pool that it isn't worthwhile? Here in Southeast Texas, the pool season is pretty much 10-11 months, so wasn't sure if that played into the equation.

    Thank you

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    Nectarologist's Avatar
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    Apr 2015
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    New York
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    362

    Re: 2 Speed vs Variable Speed on 9k Gallon Pool

    The 10-11 months does play a large role but still calculate it to be sure. I have a single speed pump and my cost is very low to run it. I was trying to keep my upfront costs down so it wasn't worth it to me (spent the money elsewhere). For me to recoup a $600 difference it would take years considering it cost me less than $200 per season (4 months) to run my pump. I guess it's hard to calculate the cost for a VS pump because the power consumption varies of course but you could do a best case scenario to compare by assuming it will consume the least amount of power possible. If the best case scenario isn't a clear winner you know it's not worth it since the reality is you'll use more power than that.

    In order to calculate the average operating cost for any electrical appliance you can use the following formula:

    watts/1000 = kW x hours of operation = kWh x kWh rate = cost

    Watts can usually be found on the appliance nameplate. If the nameplate lists amps: volts x amps = watts

    Example: How much does it cost to operate a portable electric heater? An electric heater wattage is usually given on the unit itself, or with the literature that comes with it. Our example is 1000 watts. I use the heater an average of 45 hours during winter months (1/2 hour per day for the three winter months). The City Electric Services electric rate during the winter is $.068. So -
    1000 watts/1000 = 1 kW x 45 hours of operation = 45 kWh x $.068 = $3.06
    Now take an 8 amp heater. The calculation changes just a bit:
    8 amps x 120 volts household current = 960 watts/1000 = .96 kW x 45 hours = 43.2 kWh x $.068 = $2.94

    My pool pump:

    1,840 watts (115 volts X 16 amps (per Jandy specs))
    1840 / 1000 = 1.84 kW X 8 hours of operation = 14.72 kWh X $.10 (cost/kWh) = $1.472 per day to run pool pump ($44.16 / month & $185.47 for summer of 2016 (May 14 September 17).
    Inground, vinyl liner, 16 x 32 (approx. 21k gallons), roman end w/ bench, 2 Jandy LED lights
    Pump: Jandy Flopro, 1.5 hp Heater: Raypak, 266k btu (P-R266-A-EN-C; nat gas) Filter: Jandy C340 (cartridge filter) Robot: Doheny's Dolphin Discovery

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    mas985's Avatar
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    May 2007
    Location
    Pleasanton, CA
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    11,489

    Re: 2 Speed vs Variable Speed on 9k Gallon Pool

    I have a spreadsheet in my signature that you can use to compare pumps. Here is an example of the output for $0.10/kwh:


    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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