POOL AND SPA NOTES FOR NEW START UPS

HEATER INFORMATION

· On Avg. you need about 100 Btu for every 10 sq. ft of surface area for every 1 degree F. of temp. rise.

· L x W = sq. ft.

· sq. ft/10= a

· Answer x 100Btu = Btu needed for each degree of heat rise desired.

· Answer x your desired heat rise in degrees F= Btu needed per hour to hold temp.

· answer X 24 hrs/day = Btu total

· Btu Total/ hrs of circulation per day = size of heater

Þ answer X .75% efficient = actual out put

Þ Or cubic ft x 7.5 (gallons per cu ft) x 8 lbs. per gal x heat rise desired

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Heater size / 15,000= # ton heat pump

q Spa

· Sq. ft. x avg. depth = cubic ft.

· Cu. Ft. x 7.5(gal in each cu ft.) x 8 (lbs. Per gal.)= POUNDS OF WATER.

· POUNDS x avg. 25° heat rise = Btu total

q Cost of operation.

Knowing one Btu is the amount of heat needed to raise the temperature one pound of water one degree Fahrenheit . A Therm (unit of measurement on gas bill) = 100,000 Btu/hour of heat.

· Heater Btu. Divided by 100,000 Btu per hr. = Therm per hr

· Therm per hr x hrs per day of use = Therm per day to run heater.

· Therms per day x cost per Therm = cost per day.

Ex.

· 250,000 Btu heater / 100K = 2.5 Therm per hr

· 2.5 x 8 hrs per day = 20 Therm per day

· 20 x 50 cents = $10.00 per day. Wouldn’t that be nice?