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2007 Heat Siphon Home

Spa Heat LossOutdoor SPA Heat Loss

By definition ALL SPAS NEED HEATING. Be sure your spa has an external heater hook-up

If you have an in-ground concrete spa then the heat losses are identical to a pool (see pool heat loss) .

If you own a spa with a pre-fabricated acrylic , fiberglass or vacuum-formed plastic shell either above or in ground, it will be very well insulated and usually have a built in hard cover - all of which eliminates most heat loss. Since the hard cover is usually opaque it also eliminates most re-radiation heat loss.

Once heated to temperature these spas will only lose heat rapidly when UNCOVERED just like a pool does - (via evaporation, convection and radiation heat loss) unless air jets are on.

HEAT SIPHON FAST FACTS - A normal above ground spa is usually 25 to 75 sq feet in surface area and 200 to 600 gallons which is about ONE TENTH the size of an average residential swimming pool.