description Rheem RTEX-13 Overview
The Rheem RTEX-13 is a compact electric tankless water heater rated at 13 kilowatts. Rather than storing heated water in a tank, it heats water as flow is detected, providing on-demand hot water within the limits of its electrical capacity, incoming water temperature, and required flow rate. It is intended for appropriately sized point-of-use or limited household applications and requires a suitable electrical circuit and professional installation.
help Rheem RTEX-13 FAQ
Is Rheem RTEX-13 a tankless water heater?
Yes. It is a 13 kW electric tankless unit that heats water on demand, does not use gas, and does not need a combustion vent. Rheem lists the model as Professional Classic Tankless Electric RTEX-13. [Rheem RTEX-13](https://www.rheem.com/product/rheem-professional-classic-series-rtex-08-rtex-11-rtex-13-rtex-13/)
What electrical service does Rheem RTEX-13 require?
Rheem's specification sheet lists 240 V, 54 amps, one 60-amp breaker, and 6 AWG copper wire for RTEX-13. That load is substantial, so an electrician should confirm panel capacity before installation. [Rheem specification sheet](https://files.myrheem.com/webpartners/ProductDocuments/BDC5E05F-E035-4BE9-ACED-019C16DEB769.pdf)
How many fixtures can RTEX-13 run at once?
Rheem's product page lists a maximum flow of about 3.17 GPM for RTEX-13, but usable flow falls as the required temperature rise increases. It is generally a point-of-use or modest-demand model, not a promise of several full-flow showers in a cold-climate house. [Rheem product page](https://www.rheem.com/product/rheem-professional-classic-series-rtex-08-rtex-11-rtex-13-rtex-13/)
Can I set the water temperature on RTEX-13?
Yes. The digital thermostat adjusts in 1-degree increments from 80°F to 140°F, and Rheem says the copper immersion elements are threaded for replacement. The product page lists a 5-year leak warranty and 1-year parts warranty, subject to the warranty terms. [Rheem product page](https://www.rheem.com/product/rheem-professional-classic-series-rtex-08-rtex-11-rtex-13-rtex-13/)
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