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 shown below and learn how to create an energy efficient swimming pool. The eBook will show you how to analyze your swimming pool heating costs. 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, any model of SolarAttic's solar pool heaters would have paid for itself in one to three season's savings on gas operating costs. SolarAttic's pool heaters have a fast payback, even against pool heat pumps.