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HEAT SIPHON
Lowest Operating Cost 
of All Pool & Spa Heaters

Today 1 million BTU’s cost the following to produce:
$ 7  using Heat Siphon
$17 using a Natural Gas Pool Heater
$33 using a Propane  Pool Heater
$38 using an Oil Pool Heater
$40 using Elec. Resist.  Pool Heater
1 million BTUs will make a 5°F rise in a 24,000 Gallon Pool
1 million BTUs will keep that same pool at 80°F for 2-3 days

