The Voltex® 120V Plug-In Hybrid Electric heat pump water heater from A. O. Smith makes it easier than ever for consumers to electrify to an energy-efficient option to save money on their utility bills. These models plug into a standard wall outlet for easy installation. Top water connections make it easy to replace an existing gas water heater. The Voltex® 120V has smaller room size requirements than other heat pump water heaters and integrated duct adapters for installation in confined spaces.