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The Rheem RTEX-36 is a whole-house electric tankless water heater rated at 36 kW on a 240 V, 150 A circuit. It uses four self-modulating heating elements to hold outlet temperature between 80°F and 140°F, with a 0.3 gpm activation flow and 3/4 in NPT connections. It suits homes with heavy electrical service and moderate hot-water demand, especially where gas venting is impractical. Against gas tankless models it avoids venting but draws far more power and needs a large dedicated circuit; against smaller electric units it delivers more hot water at once. It has no freeze protection and no pressure relief valve, so installers plan for those separately.
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Lowest price we've seen: $324.50 on Nov 10 at PrairieGrit. Tracked across 5 stores since Nov 10.
Owners of the RTEX line generally report steady hot water and a small footprint, but electricians and installers stress the heavy circuit requirement and reduced output in cold inlet water. Complaints center on installation cost and scaling in hard-water areas.
Electric Tankless Water Heater, Whole House, Water Heater Application General Purpose, Commercial/Residential, Watts - Water Heaters 36,000 W, Amps - Water Heaters 150 A, Voltage - Water Heaters 208/240, Min. Flow Activation 0.3 gpm, Phase - Water Heaters 1, Temp. Range - Water Heaters 59 Degrees to 140 Degrees F, Water Connection 3/4 in NPT, Temp. Rise @ 6.0 GPM 41 Degrees F, Temp. Rise @ 2.5 GPM - Water Heaters 98 Degrees F, Temp. Rise @ 4.0 GPM 62 Degrees F WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov -
