Warranties 
Rebates 
Tax Credits 
Sustainability 
Careers 
Help 
Professional Classic Series Tankless Electric RTEX-08 kW
MODEL RTEX-08 (208V PERFORMANCE)
Heating Chamber - 5 Years
Parts - 1 Year
- UEF up to .96
- Flow rate 0.8 - 1.4 GPM
- Durable, lightweight engineered polymer shell does not rust or corrode.
- Digital thermostatic temperature controls in 1-degree increments ranging from 80°F - 140°F (26°C - 60°C)
SKU RTEX-08 (208V PERFORMANCE)
Warranty Years 5
Model Professional Classic Series Tankless Electric RTEX-08
GPM 1.4
Depth 3.63"
Height 12.63"
Width 8.25"
Single Shower Minutes 9999
Number Back To Back Showers 9999
Install Location Indoor
High Efficiency Yes
Kilowatts 6
Water Connector Size 32 32
Amps 28
Recommended Breaker Size 1x40
Voltage 208
RecommendedWireSize 8
Minimum Flow GPM 0.8
Maximum Flow GPM 1.4
Adjustable Thermostat False
Professional Classic® tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applications
Performance Features- Saves Space – up to 93% smaller than a standard electric water heater
- Saves Energy – zero standby heat loss when installed near the point-of-use
- More Hot Water – up to 4 times the hot water delivery of a standard electric tank (per hour)
- 99.8% Energy efficient
- Robust copper immersion heating elements with brass top increases durability and are threaded for easy replacement
- Simple Installation
- Copper immersion heating elements improve the thermal performance providing better temperature control and faster recovery of hot water
- Designed to be mounted in an upright position with the inlet and outlet water connections on the side of the unit
- Venting is not required to operate, simplifying the installation process compared to a gas tankless water heater
- Warranty 5 Years - Leaks, 1 Year – Parts
- Standard Hand Sink – 0.5 GPM
- Kitchen Sink – 1 to 2 GPM
- Dishwasher – 1 to 2 GPM
- Washing Machine – 1 to 1.5 GPM
- Water-Saver Shower Head – 1.5 GPM
- Standard Shower Head – 2.0 GPM
Average Gallons Per Minute (GPM) based on 2010 Plumbing Standards
| MODEL NUMBER | MAX FLOW (GPM) |
| RTEX-08 | 1.95 |
| RTEX-11 | 2.68 |
| RTEX-13 | 3.17 |
Heating Chamber - 5 Years
Parts - 1 Year
More Residential Rheem Products
Find additional documentation by viewing these related products.
Performance Series Tankless Electric RETEX-8, RETEX-11, RETEX-13 kW
5-5 GPM
- UEF up to .96
- 8 kW model flow rate up to 2.0 GPM
- 11 kW model flow rate up to 2.7 GPM
- 13 kW model flow rate up to 3.2 GPM
- Digital thermostatic temperature controls ranging from 80°F - 140°F
- Copper heat exchanger
- Side ½” CF water connections
- Warranty 5 Years - Leaks, 1 Year – Parts
Professional Classic Series Tankless Electric RTEX-13 kW
2.3-2.3 GPM
- UEF up to .96
- Flow rate 1.3 - 2.3 GPM
- Durable, lightweight engineered polymer shell does not rust or corrode.
- Digital thermostatic temperature controls in 1-degree increments ranging from 80°F - 140°F (26°C - 60°C)
