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Thread: How long for a Pentair 460737 MasterTemp 400K BTU Propane Heater to heat pool?

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    How long for a Pentair 460737 MasterTemp 400K BTU Propane Heater to heat pool?

    I have a rather large free form pool, 130 per. ft. with deep end and spa. I estimate it to be in the 40,000 gal. range. It has a water fall on it as well. The water circulates through the spa when not on and over a spillway that drops 4' into the pools deep end.

    How long will it take to heat the complete pool?
    TIA

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    Mod Squad jblizzle's Avatar
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    Re: How long for a Pentair 460737 MasterTemp 400K BTU Propane Heater to heat pool?

    Welcome to TFP!!!

    Well, we would need to know the starting and target temperatures to even try to estimate it.

    - - - Updated - - -

    40k gallons is 332k pounds of water. You will get a little over 320k BTUs per hour from your heater. So, neglecting all losses (this is a HUGE assumption given all the aeration/evaporation happening from your waterfall), you would get about 1 degree per hour. So, with the losses, expect to get less than that. A cover would help retain a lot of heat.
    Jason, TFP Moderator
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    Mod Squad tim5055's Avatar
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    Re: How long for a Pentair 460737 MasterTemp 400K BTU Propane Heater to heat pool?

    Plus loss to ambient air temperature and amount of sun received will have an effect. A large pool with no thermal cover will loose temperature quickly.

    You say you are from "Spicewood" but a state would help pin down your temperatures.

    It would help us if you would add the following information to your signature

    • The size of your pool in gallons
    • If your pool is an AG (above ground) or IG (in ground)
    • If it's IG, tell us if it's vinyl, plaster/pebble, or fiberglass
    • The type of filter you have (sand, DE, cartridge) and, if you know, the brand and model of the filter.
    • If you know, please tell us the brand and model of the pump, and mention if is it a two speed or variable speed pump.
    • Date of pool build/install, particularly important if less then a year old.
    • What kind/model of water test kit you are using
    • Other significant accessories or options, such as a spa , SWG, or cleaner

      Welcome!!
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: How long for a Pentair 460737 MasterTemp 400K BTU Propane Heater to heat pool?

    I have a MasterTemp 400HD with a 19,000 gallon vinyl inground pool. I typically get 2 degrees per hour.

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    Re: How long for a Pentair 460737 MasterTemp 400K BTU Propane Heater to heat pool?

    1-2 degrees per hour is correct. Of course there can be outside factors that could lower this value as well. When heating a pool it is best practice to keep it covered when not in use.
    Paul
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