The most energy-efficient option for residential water heaters in Janesville, WI, is a tankless or heat pump water heater. These systems use less energy by heating water on demand or extracting heat from the air. Addie Water Systems Inc. offers expert installation and maintenance of energy-efficient water heaters, helping homeowners save on utility bills while reducing their environmental impact. For more information visit their website at https://addiewatersystems.com/water-heaters/