Spa Heater Sizing

Model 125 175 250 325 400 Spa Size (Gallons) Time to Heat Spa 30°F (Minutes) 200 30 21 15 12 9 400 60 43 30 23 19 600 90 64 45 35 28 800 120 86 60 46 37 1000 150 107 75 58 47

TO CHOOSE A SPA HEATER SIZE: Print this page out. Identify the number of gallons your spa holds. Decide the heat-up time desired, and note on the chart above which Lite2 model is recommended. The chart indicates the approximate time required to raise the spa temperature 30°F. 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.

Specifications subject to change without notice.

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