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Rheem The Rheem Perfomance RTEX-11 is an 11 kW tankless electric water heater ideal for point-of-use applications. This unit is great for a point-of-use application Rheem tankless electric water heaters offer a continuous endless supply of hot water. A lower kilowatt unit can provide hot water on demand for single or multiple point-of-use applications while a higher kilowatt unit could provide hot water for a whole house depending on the inlet ground water temperature. Tankless electric water heaters save space save energy save money and require no venting. The sleek compact size 90 percent smaller than a tank allows you to save space and place the unit wherever you want including under a sink. Tankless units only draw energy when hot water is flowing while traditional tanks are constantly drawing energy to keep the water in the tank at the desired temperature.