Designed to provide an endless supply of hot water for kitchen, bathroom lavatory, and handwashing sinks. 99% efficient. 5 year warranty on heater, 1 year on parts. For use in both commercial and residential settings. Installs vertically or horizontally. Solid copper heat exchanger, copper-sheathed elements, and tough plastic housing. No temperature/pressure relief valve necessary (check local codes). 240V/9.5kW/40A circuit breaker/8-gauge wire. Unit must be hard wired.