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Thread: Any downfall to installing a "too big" heater?

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    Any downfall to installing a "too big" heater?

    We are contemplating a 200,000 BTU heater for our 21' foot round pool.
    It is used, 1 year old and a good price which is why we are looking at it.

    Up here in Ontario, even with the great summer we had our swimming season is just too short and we need some help!

    Is there any real problem with installing a heater that is "too big" for our pool.
    The Hayward website states that we should have something more around 130K BTU....

    We are looking at the Hayward H200
    21' x 52" Round Above Ground. (Buried 2') AquaPro 1HP pump, Jacuzzi 19" Sand filter, Hayward inline chlorinator.
    SunQuest 2 x 2'x10' Solar heater.

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    mas985's Avatar
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    Re: Any downfall to installing a "too big" heater?

    Other than cost, there is no downside. The larger the heater, the quicker it can heat. However, if you want the heater for on demand heating, you might find that even 200k is too small. With that size pool and heater, it will raise the temperature less than 2 degrees per hour.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Any downfall to installing a "too big" heater?

    If you're considering a used heater, make sure it is still hooked up and working before you buy it. You also need to Consider the age of it. You have no idea how much more life you may get from it so you are really rolling the dice on a used heater.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Any downfall to installing a "too big" heater?

    If it's a natural gas unit you may need a bigger meter or a larger feed line from the meter to the heater.
    20' x 40' 30,000 gallon IG Plaster with Spa, wading pool, fountain built 1993
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    Jun 2014
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    Uxbridge Ontario
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    Re: Any downfall to installing a "too big" heater?

    Thanks for the input!
    I know we are taking a gamble on a used unit. Unfortunately it is not hooked up as it was purchased with other equipment from a pool fill in. The people we are buying from bought the lot for the other stuff that came with it to change over to a saltwater pool. They already have a heater so didn't need this.
    It is reportedly only one season old.

    we don't currently have a heater so the gas line needs to be run out to the pool anyway.
    We are worrying about those logistics next season.
    21' x 52" Round Above Ground. (Buried 2') AquaPro 1HP pump, Jacuzzi 19" Sand filter, Hayward inline chlorinator.
    SunQuest 2 x 2'x10' Solar heater.

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    jwhop3's Avatar
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    Re: Any downfall to installing a "too big" heater?

    Quote Originally Posted by tmurphy View Post
    We are contemplating a 200,000 BTU heater for our 21' foot round pool.
    It is used, 1 year old and a good price which is why we are looking at it.

    Up here in Ontario, even with the great summer we had our swimming season is just too short and we need some help!

    Is there any real problem with installing a heater that is "too big" for our pool.
    The Hayward website states that we should have something more around 130K BTU....

    We are looking at the Hayward H200
    Not being able to reach the buttons, maybe?
    14,000 gallon Fox Lagoon, ingound vinyl
    PacFab Sand filter
    installed April, 2002
    Frog inline chlorinator
    Town water

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