Rheem Performance RTEX-08 8 kW Tankless Electric Water Heater
Community verdict
The Rheem Performance RTEX-08 functions well as a point-of-use tankless water heater, praised by owners for supplying rapid hot water directly under a single tap or sink. Its compact design fits neatly into tight spaces for dedicated kitchen or handwashing uses. However, reviewers repeatedly warn that its 8 kW output cannot support multiple fixtures or high-flow applications like showers, with several citing temperature fluctuations or unexpected unit failures.
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Community Verdict
A concise summary of what verified buyers of Rheem Performance RTEX-08 8 kW Tankless Electric Water Heater consistently praise — and what they don’t.
Buyers love 3
- +Compact space saving design
- +Quick water heating
- +Under sink convenience
Keep in mind 4
- −Limited to single fixture
- −Inconsistent water temperatures
- −Tricky plumbing fittings
- −Sudden component failures
What people are saying
4 quotesDirect organic buyer opinions about Rheem Performance RTEX-08 8 kW Tankless Electric Water Heater, filtered for spam and ads.
Hot water in a few seconds, it holds the setting on a normal kitchen flow, and the 8 kW is enough for one tap and no more.
I have the unit placed under the kitchen sink and is convenient for cooking water preheat. Instant noodles, grits, oatmeal
It was working fine. Nothing happened, nothing changed, just...boom. No hot water. Display won't even come on.
The water never gets to 140F, it only stays warm for a min before going cold and then warm again, and then the bath tub faucet does not get warm