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

[alias54]

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

 

[jblizzle]

Welcome to TFP!!!

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

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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.

 

[tim5055]

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!!
  

 

[thadius65]

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

 

[ps0303]

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.