WARNING: Natural gas reached $1.30 per therm in January 2001. With this high gas price, you could easily incur monthly costs of $500 to $700 and more to simply operate a natural gas swimming pool heater depending upon the size of your pool and its energy dynamics. Download the eBook below to analyze your pool heating costs and to learn how to create an energy efficient swimming pool. Don't get caught off guard by exorbitant operating costs for natural gas, propane, other fossil fuel pool heaters or even pool heat pumps. At current high energy rates, SolarAttic's pool heater will pay for itself in one-three season's savings on gas operating costs. It's a fast payback, even against pool heat pumps.