ENERGY STAR® certified, AeroTherm™ Series water heaters are eligible for most rebate programs throughout the country resulting in initial savings to the consumer. Efficiencies up to 3.1 EF (Energy Factor) result in significant energy and money savings throughout product lifetime. First hour delivery ratings up to 92 gph and ultra-quiet operation ensure consumers get exceptional performance to meet their demands for hot water. And with four user-selectable operation modes (Heat Pump, Hybrid, Electric, Vacation), the new AeroTherm™ Series gives consumers greater control over their water heater's energy consumption.