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Thread: Heating question

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    mitch08's Avatar
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    Heating question

    Sort of a crazy heating question for you guys.

    My heater usually gets me about 1 degree every 2 hours or so. Maybe at best 2 every 3 hours...
    Its been that way forever. I think its a 250k btu and the pool is about 25000g.

    Everything appears to be running properly. Pool is heating perfectly to about 85 degrees.
    Then seems to be getting stuck at 85.

    My question is, can this be weather related? The outside air temp is about 75. Which is 10 degrees cooler than my pool. Am I just fighting an uphill battle against the air temp? Or should I be looking for an issue with the heater? Thanks a lot
    18x38 Inground Liner (25k gal) Paver surround, multi-speed pump, DE Filter, Raised spill over spa, TF-100

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    Re: Heating question

    You have a little over 200,000lbs of water in the pool. A BTU is the energy required to raise 1 lb of water 1 deg. Assuming a 250,000BTU/hr heater at 80% the input to the pool is roughly 200,000 BTU/hr. That is right at the 1 deg/hr temp rise that I would expect. If the air temp is lower than 85 deg the temp will likely not get much over that due to heat loss.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    mitch08's Avatar
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    Re: Heating question

    Thanks for the quick response. It has been pretty cool at night. I normally heat the pool to about 84 during the day. Then around 3pm ill turn the heat back on and try to get it to about 88 or so for the night. I dont usually have too much trouble doing that but its probably much warmer than mid 70s in the summer. Its still pretty early in the season.

    I never really get a degree per hour. But my heater is pretty old so prob less efficient than most. Thanks again...
    18x38 Inground Liner (25k gal) Paver surround, multi-speed pump, DE Filter, Raised spill over spa, TF-100

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    Re: Heating question

    Remember, once the water temp gets over the air temp you will loose heat to the air which will reduce the perceived efficiency of the heater. Kind of like leaving a window open in the house during the winter heating season.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    mitch08's Avatar
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    Re: Heating question

    Yeah very good point. I probably might as well have been burning $20s all weekend by running that thing all day and night
    18x38 Inground Liner (25k gal) Paver surround, multi-speed pump, DE Filter, Raised spill over spa, TF-100

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    Richard320's Avatar
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    Re: Heating question

    The bubble-wrap solar blankets will help a lot when you're heating. They're just such a pain to remove.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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