Extremely small, under skink/cabinet installation, 10-year manufacturer warranty on heat exchanger, Certified for safe use in manufactured houses and mobile homes, Fully electric tankless water heater saves energy costs, Continuously supplies up to 4 gallons per minute, Low output makes it unsuitable for busier homes, 1 year only warranty on parts other than heat exchanger, No warranty if the installation is performed by the owner, Will need yearly vinegar flushing in homes with hard water. I am a graduate in Mechanical Engineering. It has an external adjustable thermostat control. When empty, turn off the hot water and reattach the cold water pipe. Rheem RTE 13 water heater is a reliable and affordable replacement for the energy-wasting tanked heaters. Rheem RTE 13 - Reviews, Prices, Specs and Alternatives . costs.The