Raypak digital heaters have an electronic ignition, a digital thermostat and Polymer headers. They are gas powered and suitable for use with swimming pools and spas. These heaters are designed for residential application and combine durability and smart design to be some of the best on the market. Their attributes include exceeding federal and state fuel efficiency standards, high flow rates, condensation protection and wind-resistant design to withstand the elements for years to come. **This item is unable to be shipped to the state of California**