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Thread: What type of heating system do you recommend?

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    What type of heating system do you recommend?

    Hi,

    We live in Southern California. We have a 16x32' IG 26,880 gallon pool with an automatic vinyl pool cover. Over the weekend I successfully installed a new Sta-Rite DE filter. During the installation, I removed an old and rusted Purex Tropical Isle NG heater that's gone unused for four seasons now. Now I'm thinking I'd like to install a new heating system to extend our summer a bit. Natural Gas is inexpensive during the summer months. I've had bills of only $18 at times.

    Would NG still be a good choice (as opposed to a Heat Pump) and if so, what BTU rating would you recommend for this size pool? The water temperature averages about 72 in May but I'd like to bump that up to around 83-85 degrees starting on Friday and ending on Sunday. Thanks for any responses.
    30000 gal.
    Pentair 60 sq. ft. DE filter 150 gal. per min.
    IG 20X40 Free Form gunite/plaster
    2 hp Purex pump
    Corona, Ca.

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    Join Date
    May 2007
    Location
    South Central NJ
    Posts
    3,192

    Re: What type of heating system do you recommend?

    1st, a 16 x 32 with a 3-1/2 to 8' depth just several hundred gallons under 20,000 gallons. Unless your dimensions are off or your depths are deeper, you needed to know that.

    2nd, you will want a solar cover too. This will reduce the overnight losses due to evaporation. It will also help the pool stay a little warmer in the sun, and reduce chlorine loss because less water is exposed to air, reducing evaporation.

    Adding: Forgot you have an auto-cover. You don't need it but others without would.

    3rd, find out if your gas meter can accommodate a pool heater's demands, and if not, how much is it to get a bigger meter.

    4th, The size you want is a 400,000 BTU unit. This is the largest residential size. It works fastest and has the same efficiency as smaller models. Think of it like this: 1 BTU = energy needed to heat 1 lb of water 1 degree. 1 gallon- 8.35 lbs. It will take about 165000 BTUs to heat your pool one degree. A 400K heater will run about 84% efficient. Losses due to surrounding conditions with the solar cover in place may add another 5% loss and more without the solar cover. That amounts to about a 2 degree rise per hour of operation. Smaller heaters are available but that means you need to run the pump longer, not cheap in your neck of the woods. Your going to burn the same amount of gas to get to where you want to be and to hold it.

    Have a great day!

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

  3. Back To Top    #3

    Re: What type of heating system do you recommend?

    Quote Originally Posted by PoolGuyNJ
    1st, a 16 x 32 with a 3-1/2 to 8' depth just several hundred gallons under 20,000 gallons. Unless your dimensions are off or your depths are deeper, you needed to know that.

    2nd, you will want a solar cover too. This will reduce the overnight losses due to evaporation. It will also help the pool stay a little warmer in the sun, and reduce chlorine loss because less water is exposed to air, reducing evaporation.

    Adding: Forgot you have an auto-cover. You don't need it but others without would.

    3rd, find out if your gas meter can accommodate a pool heater's demands, and if not, how much is it to get a bigger meter.

    4th, The size you want is a 400,000 BTU unit. This is the largest residential size. It works fastest and has the same efficiency as smaller models. Think of it like this: 1 BTU = energy needed to heat 1 lb of water 1 degree. 1 gallon- 8.35 lbs. It will take about 165000 BTUs to heat your pool one degree. A 400K heater will run about 84% efficient. Losses due to surrounding conditions with the solar cover in place may add another 5% loss and more without the solar cover. That amounts to about a 2 degree rise per hour of operation. Smaller heaters are available but that means you need to run the pump longer, not cheap in your neck of the woods. Your going to burn the same amount of gas to get to where you want to be and to hold it.

    Have a great day!

    Scott

    Excellent advice.

    I am in so cal as well, and have 12 panels and a 400K btu unit.
    It cost me 5K to relocate and add a bigger meter so be careful you can run into more cost overruns than lockheed very quickly.

    If you add solar you can get away with a lower BTU unit as the 2 can be additive and really kick your pool up when needed (during the day of course)

    I would NEVER build a pool without solar again and have used my pool more in the last 2 year than I did the 10 prior years because I can afford to keep it hot now and can heat it up quickly for guests in the offseason without it taking days to do so.

    Let us know how you go, and if you want to stop by and see what I have going on im happy to show you. my pools at 78 today off the roof alone using a 750 watt (1HP) solar tap speed. If I need more than that I can kick the gas or run the epump faster - or both.


    Uncle Dave
    20K Gallon Gunnite pool/900 Gallon in ground Spa/2HP WhisperflowSpa
    Pentair Master temp 400/Hayward Sand Zebrite/Jandy RS-8 Aqualink/Jandy 2HP Epump
    12 - 4x10 Solar Panels/Barracuda G3/ BBB

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: What type of heating system do you recommend?

    Another vote for solar if you have somewhere to put the panels.
    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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