PowerStar AE-12 Electric Tankless Under Sink Water Heater 12 kW output tankless electric water heater eliminates long waits for hot water at point-of-use Easy installation under bathroom or kitchen sink Features thermostatic control for easy temperature output adjustments 98% efficient with minimal stand-by loss Unit is only designed to operate on 240-volt Eliminates long waits for hot water Easy installation 99-Percent efficient This unit is only designed to operate on 240v