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The Rheem RTEX-27 is a 27 kW, 240 V tankless electric water heater that heats water on demand with no tank and no venting. Electronic controls set the outlet temperature in one-degree steps from 80 to 140°F, and the unit modulates its draw to match flow. Its 7 GPM maximum and 0.3 GPM minimum flow suit whole-home use in warm climates or point-of-use jobs like a remote bathroom or commercial sink. Against gas tankless models it needs no venting and fits under cabinets, but it draws 112 A and needs three 40 A breakers with 8 AWG copper, so the electrical panel and service capacity matter more than the unit itself.
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Owners of the RTEX line report steady hot water for showers and point-of-use sinks and like the small size and precise temperature setting. Electricians and buyers repeatedly flag the heavy electrical demand and the need for a large panel and dedicated breakers.
The Rheem RTEX-27 is a 27kW, 240V electric tankless water heater. It provides instant, continuous hot water. It heats water only when needed, and it can reduce water heating costs by up to 50 percent in point-of-use applications.
The compact unit needs no venting. It can be installed in tight spaces, including under cabinets or sinks. Electronic temperature control adjusts in one-degree increments from 80 to 140 degrees Fahrenheit.
It is intended for residential or commercial use where space is limited.
