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Thread: how much $ for electricity?

  1. Back To Top    #1

    Join Date
    May 2009
    Trenton NJ

    how much $ for electricity?

    I have a 350 gallon hot tub that I keep at 101-102 degrees. What is a good estimate for cost (electricity) per month? I know there are other variables as far as cleaning cycles etc. but what do you think is a good estimate? Its 5 years old marque spa.
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: how much $ for electricity?

    There are too many variables for us to guess. Even if someone had an identical model and ran it the same it still probably wouldn't match exactly. Your best bet is to get an amp meter and measure it and figure it out. You could use something like a "Kill-a-watt" if it's 120 volts.
    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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  3. Back To Top    #3
    susa's Avatar
    Join Date
    Oct 2010
    Deep South

    Re: how much $ for electricity?

    far better is a TED5000 unit, link here, simple to install and use

  4. Back To Top    #4

    Join Date
    Jun 2009
    Vero Beach, FL

    Re: how much $ for electricity?

    You can make an estimate based on how much your hot tub temp drops in a given time, which is directly related to the insulation of your hot tub and cover.

    It takes about 2.44 watt-hrs to heat 1 gallon of water 1 degree F. As soon as your heater shuts off for a cycle, turn it completely off and measure the temp drop over 24 hrs. If you calculate that your tub drops 20 degrees in a day, then you can calculate as follows:

    2.44 watts x 20 degrees x 350 gallons = 17 kw-hrs. x cost of electricity = $/day.

    There is a lot of simplification here, so your usage is going to be more in reality, but this should give a close approximation on what it costs to maintain your temp. The greater your temp drop over the 24 hrs, the more off your calculation will be. Variables are outside air temp, how much you use the hot tub, efficiency of the heater, etc.

    A more accurate way to calculate would be to monitor how long your heater runs every day, but that is usually difficult to do manually, so that is where the kill-a-watt or a simple hour meter comes in handy.
    25' x 13' Roman, 12000 gal IGP, Plaster, with 500 gal Spa
    SWG, 1 HP Max Flo Pump, C-900 cartridge filter
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