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The Rheem RTEX-27 Professional Classic is an electric tankless water heater rated for whole-home use up to 6 GPM. It is compact enough for tight spaces and can also serve point-of-use spots like a sink or washing machine. In warmer climates it can run several fixtures at once; in colder incoming water it delivers less hot water, so sizing matters. Against gas tankless rivals it needs no venting, but it draws heavy electrical current and usually requires dedicated circuits and professional installation.
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The Rheem RTEX-27 is an electric tankless water heater from the Professional Classic Series. It is made for new construction and for home applications, including point-of-use installation. Its compact design fits in tight spaces and is up to 93% smaller than a standard electric water heater.
Copper immersion heating elements sit in a multi-chamber design for better temperature control and faster hot water recovery. A copper heat exchanger transfers heat quickly and resists corrosion. The shell is powder-coated and has a galvanized steel backplate. Brass 3/4" NPT inlet and outlet connections are at the bottom of the unit.
The heater mounts upright and needs no venting. Self-modulating technology uses only the power needed to meet hot water demand, and there is no standby heat loss when it is installed near the point of use. It delivers up to 4 times the hot water per hour of a standard electric tank. Digital thermostatic controls adjust the temperature in 1-degree increments.
