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Thread: Pool Heater Calculations / Info

  1. Back To Top    #1

    Join Date
    Jan 2011
    Riverside, CA

    Pool Heater Calculations / Info

    We used the heater on the pool for the first time this weekend. I wasn't sure how quickly it would change the water temp, so I kept track of some of the variables.

    The Heater is a Jandy LXi400 Gas Heater (400,000 Btu). We had 2 "Deep Heat" return lines run to the floor of the pool. I switched to these returns the morning I started the heater. The pool was uncovered the whole time (I didn't get a change to wash off the solar cover ) All temperature reading are from the Jandy PDA Remote.

    I tried to get temps at the same time, but it didn't work out...

    It will take the Spa (about 400-500 Gal) from 50 deg to 100-102 in about an hour.

    If anyone else has some data on your pool, feel free to post it.

    4/18 - Day High Temp 84 Overnight Low Temp 53

    4/19 - Day High Temp 85 Overnight Low Temp 56

    - 8:00am - Air Temp 59 - Water Temp 66
    - 3:00pm - Air Temp 87 - Water Temp 74

    4/20 - Day High Temp 99 Overnight Low Temp 57

    - 8:00am - Air Temp 63 - Water Temp 68
    - 9:00pm - Air Temp 71 - Water Temp 74

    4/21 - Day High Temp 92

    - 6:00am - Air Temp 58 - Water Temp 71 ** Heater turned on and set to 84
    - 11:30am - Air Temp 89 - Water Temp 84 ** Heater turned off for the Pool and switched to the Spa
    - 7:00pm - Air Temp 77 - Water Temp 82

    I think I gained about 1 degree per hour of the heater running. And if I read the meter correctly it used 22,000 CF of Natural Gas. And if I calculated the cost correctly it is about $17.50.
    40x20 Free Form IG Pool (aprox 29,000 Gal, 140 Perimeter, depth 3'6"-7', Baja Shelf, 8x8 Free Form Spa) - Gunite Shell, Pebble Plaster Finish, Poured Concrete Coping - 3 Deep Heat Returns - Jandy LXi400 Gas Heater (400,000 Btu) - Jandy Variable Speed Pump JEP 2.0 - Jandy CL 600 Filter - HASA Liquidator - Jandy PDA 6 w/ Remote - 4x Jandy WaterColors Pool LEDs - 48" Gas Fire Pit - 6x Gas Tiki Torches - 12'x15' U-shaped BBQ Island (Firemagic Equipment)

  2. Back To Top    #2

    In the Industry

    Join Date
    Feb 2012
    Phoenix, AZ

    Re: Pool Heater Calculations / Info

    Thanks for sharing! Using your solar cover will certainly help you retain heat (especially at night), and will cut down the amount you need to run your heater!

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