The Rheem Prestige Series Hybrid Heat Pump Water Heater includes a full-color, backlit touch-screen control to provide text-based diagnostics and service alerts. With an Energy Factor of 2.45, the hybrid water heater transfers available heat from the ambient air instead of using a conventional electric element. This series has a wide operating temperature of 37 to 120 degrees Fahrenheit, which makes it certified for operation in cooler geographic areas like Northern climates. The unit has a 21-in. diameter and includes a 10-year limited tank and parts warranty.