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 Pool Heater Sizing
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Model Lite 2 LG/LJ

LX/LT

 Hi-E2
Size 125 175 250 325 400 250 400 350
°F Rise Max Pool Surface Area (Sq. Ft.)
15°F 889 1244 1778 2311 2844 1778 2844 2844
20°F 667 933 1333 1733 2133 1333 2133 2133
25°F 533 747 1067 1387 1707 1067 1707 1707
30°F 444 622 889 1556 1422 889 1422 1422
35°F 381 533 762 990 1219 762 1219 1219
TO SIZE A POOL HEATER: First, determine your pool's approximate surface area in square feet. Next, determine the desired temperature difference (or "rise") by subtracting the coldest average air temperature when the pool will first be in use from the desired pool water temperature. For example, if 85°F is the desired pool water temperature, subtract the air temperature when the pool is first used (i.e. 60°F); thus the pool's temperature must be raised by 25°F.  Then, using the Pool Heater Sizing chart above, match the the necessary temperature rise and surface area of your pool with the appropriate model and size heater. Sizing chart based on 3½ mph. average wind and average pool depth of 5½ feet.
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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