Rheem RTEX-13 Residential Tankless Water Heater
Community verdict
The Rheem RTEX-13 offers a compact, space-saving solution that delivers quick hot water for point-of-use fixtures or small, low-demand applications. Users appreciate its fast heat-up time and reliable output when running single low-flow faucets in warmer climates. However, buyers frequently report flow-rate limitations when attempting to fill bathtubs or supply multiple high-draw fixtures simultaneously, along with occasional installation hurdles related to electrical requirements and plumbing fittings.
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Community Verdict
A concise summary of what verified buyers of Rheem RTEX-13 Residential Tankless Water Heater consistently praise — and what they don’t.
Score blends 5.8/10 from 25 reviews we read with 118 Google Shopping ratings averaging 4.4★.
Buyers love 3
- +Compact space-saving design
- +Fast warm-up time
- +Sufficient for single fixtures
Keep in mind 4
- −Limited GPM capacity
- −Struggles with high-demand fixtures
- −Tricky electrical installation
- −Requires dedicated circuit
What people are saying
4 quotesDirect organic buyer opinions about Rheem RTEX-13 Residential Tankless Water Heater, filtered for spam and ads.
This unit provides *warm* water after about 7-8 seconds and is fully heated after 15 seconds vs. the nearly two minutes we used to wait.
The gallons per minute output on that tankless probably can't keep up with your tub but has an easier time with your faucets
I installed a Rheem RTEX13 electric tankless water heater... but am hearing an electric buzz whenever the heater is running.
These electric tankless units are horrible just warning you.
Where to Buy
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Prices updated 1 hour ago.