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The Rheem Professional Classic 27kW is a whole-house electric tankless water heater that heats water on demand, providing endless hot water for showers and appliances. It requires a 240V circuit with three 40A breakers and 8 AWG wiring, so professional installation is recommended. With a 0.3 GPM activation flow and 99.8% energy efficiency, it avoids standby losses typical of tank heaters. It suits households with sufficient electrical capacity and moderate simultaneous hot water demand, but its high power draw may require an electrical panel upgrade.
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The Rheem Professional Classic 27kW is a residential electric tankless water heater for indoor use. It heats water on demand, so hot water does not run out during showers or back-to-back showers. It mounts on the wall.
It has three copper-clad immersion heating elements with brass terminations for increased durability. Each element is rated 9 kW, for a maximum of 27 kW. The unit turns on at a flow of 0.3 gpm and handles flow rates from 0.3 to 6.6 gpm.
The standard temperature setting is 120°F, adjustable from 80°F to 140°F. Temperature accuracy is +/-1° increments at steady flow.
