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 Spa Heater Sizing
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Model Lite 2 LG/LD/LJ

LX/LT

 HiE2

Size

 125 175 250 325 400 250 400 350
Spa Size Time to Heat Spa 30°F (Minutes)
200 Gals 30 21 15 12 9 15 9 9
400 Gals 60 43 30 23 19 30 19 19
600 Gals 90 64 45 35 28 45 28 28
800 Gals 120 86 60 46 37 60 37 37
1000 Gals 150 107 75 58 47 75 47 47
TO CHOOSE A SPA HEATER SIZE: Determine the number of gallons your spa holds. Choose how quickly you want the spa to be ready to use, and match your spa's size and heating time with the appropriate model. The chart indicates the approximate time required to raise the spa temperature 30°F. For example, a model number 250 heater on a 600 gallon spa will take approximately 45 minutes to raise temperature approximately 30°F (depending on wind, insulation, etc.).
FUEL CONSUMPTION: To get an idea of fuel consumption, divide the heater's input in by the energy content of the fuel. For example, divide 400,000 (BTUs per hour input of a Model 400 heater) by 91,500 (BTUs in one gallon of liquefied propane gas (LP): 400,000 ÷ 91,500 = 4.37. Thus, a spa/pool heater with an input of 400,000 BTUs per hour will use approximately 4.4 gallons of LP gas per hour.

1 cubic foot of natural gas = 1050 BTU
1 gallon of liquefied propane gas = 91,500 BTU
OPERATING COSTS: Multiply fuel consumption by the price you pay for each unit of fuel. For example, if you pay USD $1.50 per gallon for LP and a Model 400 heater uses 4.4 gallons of LP gas per hour, then it will cost you approximately USD $6.60 per hour to operate.
More Information:
Detailed Pool/Spa Sizing Guide in Adobe Acrobat PDF Format (Adobe Acrobat required). Detailed Pool/Spa Sizing Guide
Specifications subject to change without notice.
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