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Thread: Heater sizing

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    Join Date
    Jun 2016
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    FL
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    Heater sizing

    After following so many recent build projects, I am thinking maybe my heater is too small (Hayward 5hp 140k btu)? We will likely only ever heat the entire pool (34x17 free form; 4-5 feet) for 2 months out of the year but we will use the spa frequently (approx 1-2 times per week). Spa size is 7 foot round. Any thoughts on if I should upgrade before our build?

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    Jan 2016
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    Mesa, Az
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    Re: Heater sizing

    How do you have a horsepower rating on your heater?? I wouldn't use anything smaller than a 400K but heater if you are going to try to heat any size pool.

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    borjis's Avatar
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    Re: Heater sizing

    maybe referencing his pump which seems way over sized if it really is 5hp.

    I'm 16x32 3.5 to 7 feet with a 250k btu heater. I'm satisfied with the performance and cost (about $ 30 a month for gas, only using when needed) so that one you have seems a bit small if your asking about it.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  4. Back To Top    #4

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    Re: Heater sizing

    Yes, I misspoke. It is an electric heat pump and not a gas/propane heater. Bjoris, can you elaborate on your thoughts of it actually being oversized?

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    Niagara Falls, NY
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    Re: Heater sizing

    I'm not familiar with Hayward equipment but I have a little bigger pool and pentairs sizing tool led me to a 120k btu heat pump, the btu ratings on heat pumps are less than gas heaters.

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    Garnerville NY
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    Re: Heater sizing

    I'm getting nervous reading some of these responses I have 16x32 free form 20,000 gal. And pb recommended a 117 rheem heat pump



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    borjis's Avatar
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    Re: Heater sizing

    Quote Originally Posted by grumpiebk View Post
    Yes, I misspoke. It is an electric heat pump and not a gas/propane heater. Bjoris, can you elaborate on your thoughts of it actually being oversized?
    by pump I meant pool pump not a heat pump.

    I don't know anything about those.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  8. Back To Top    #8

    Join Date
    Jun 2016
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    FL
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    Re: Heater sizing

    As I understand it after doing more research after confusing myself, electric heat pump options only go up to 140K BTU, while gas heaters go up to 400K+ BTU. The heat pump is more cost effective but takes longer to heat. Given I live in south florida and do not have natural gas or propane, the heat pump is a no brainer for me. It may struggle to get my spa to 103-105, but itll do the trick.

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