Rheem® Classic® Series Tankless Electric Water Heaters
Experience comfort, savings, and convenience with dependable and innovative hot water solutions.
For more information, visit Rheem.com/TESelect.
Key Benefits
- Heats water only as needed, saving up to 50% on water heating costs.
- Delivers on-demand, continuous hot water with no waiting.
- Compact design suitable for whole-home or point-of-use applications.
- Designed for easier installation.
Ideal Applications
- Bathroom sinks, showers, and tubs
- Kitchen sinks and dishwashers
- Detached buildings, cabins, workshops, and barns
- Boat & RV kitchens and bathrooms
Important Consideration
Consult an electrician to confirm your breaker box is ready for your new tankless water heater.
Model Specifications
| Model # | kW | Amps | Volts | Recommended Breaker Size | Height x Width x Depth (inches) |
|---|---|---|---|---|---|
| RHEEM® CLASSIC® POINT-OF-USE TANKLESS | |||||
| RTEX-04 | 3.5 | 29 | 120 | (1x30)A | |
| RTEX-06 | 6 | 29 | 220 | (1x30)A | 5-1/8 x 10-1/8 x 2-4/8 |
| RTEX-08 | 8 | 33 | (1x40)A | ||
| RTEX-11 | 11 | 46 | 240 | (1x50)A | 12-1/8 x 8-1/4 x 3-4/8 |
| RTEX-13 | 13 | 54 | (1x60)A | ||
| RHEEM® CLASSIC® WHOLE-HOME TANKLESS | |||||
| RTEX-18 | 18 | 75 | (2x40)A | 18-1/4 x 14-1/8 x 3-1/8 | |
| RTEX-24 | 24 | 100 | 240 | (3x40)A | |
| RTEX-27 | 27 | 112 | (3x40)A | 18-1/4 x 17-1/8 x 3-1/8 | |
| RTEX-36 | 36 | 150 | (4x40)A | ||
Why Choose Rheem?
Established in 1925, Rheem's mission is to help families enjoy a new degree of comfort with solutions that keep you cool in summer, warm in winter, and enjoying hot water year-round.
360°+1 Design Philosophy
Rheem® Classic® Series Tankless Electric Water Heaters are designed for lasting comfort, developed using the 360°+1 design philosophy. Rheem evaluates every detail from every angle to deliver the best homeowner experience.
Start Saving Today!
Visit Rheem.com/TESelect or ask your local Independent Rheem contractor for more information.
According to the Department of Energy, tankless water heaters can provide significant energy savings. For detailed information on advantages, visit energy.gov.
Refer to the Rheem Warranty Guide on Rheem.com for additional warranty information.
Product Features
Energy & Cost Savings
Heats water only when needed, offering savings of up to 50% for point-of-use applications or 34% for whole-home solutions.
Instant, Continuous Hot Water
Provides ample hot water without delay, saving time and water. Review the selection guide to ensure the model meets your specific hot water needs based on geographic location and climate.
Space Savings
The small, compact design fits conveniently in tight spaces such as closets, under cabinets, and sinks.
Easy Installation
Compatible with 1/2 and 3/4-inch water connectors for flexible hose installation. No venting or T&P valve is required. Professional installation is recommended.
Designed for Peace-of-Mind
Rheem® Classic® Series Tankless Electric Water Heaters are simple to use, easy to own, and backed by an exceptional warranty and features designed for peace-of-mind.
- Great Investment & Value: Enjoy energy cost savings with a 5-year heating chamber warranty and a 1-year limited parts warranty.
- Easy to Adjust: Features electronic temperature control adjustable in 1° increments from 80°-140°F with an easy-to-read display (compatible with Celsius and Fahrenheit).
- Easy to Maintain: Equipped with durable, easy-to-replace heating elements.
- Longer Lasting: Tankless water heaters typically last over 20 years, longer than traditional tank water heaters.
Financing Options
Quick & Easy Financing: KwikComfort® Financing offers flexible credit options available through select independent Rheem contractors.
Selecting Your Tankless Electric Water Heater
Choosing the right Rheem tankless electric water heater is straightforward. Consider your location and seasonal temperature variations, as the average water supply inlet temperature differs by region. Refer to the map to identify the temperature zone for your area.
Based on your location's temperature zone, select a product that meets your hot water demands. The table below provides guidance on maximum Gallons Per Minute (GPM) and approximate usage based on inlet temperatures.
| Model | Inlet Temp. 37-47°F | Inlet Temp. 47-57°F | Inlet Temp. 57-62°F | Inlet Temp. 62-77°F | ||||
|---|---|---|---|---|---|---|---|---|
| Max GPM | Approx. Usage | Max GPM | Approx. Usage | Max GPM | Approx. Usage | Max GPM | Approx. Usage | |
| RETEX-04 | Not Recommended | Not Recommended | 0.6 | 0.9 | ||||
| RETEX-06 | 0.7 | 0.9 | 1.0 | 1.5 | ||||
| RETEX-08 | 0.94 | 1.14 | 1.27 | 1.95 | ||||
| RETEX-11 | 1.30 | 1.57 | 1.75 | 2.68 | ||||
| RETEX-13 | 1.53 | 1.85 | 2.06 | 3.17 | ||||
| RETEX-18 | 2.1 | 2.6 | 2.9 | 4.4 | ||||
| RETEX-24 | 2.8 | 3.4 | 3.8 | 5.9 | ||||
| RETEX-27 | 3.2 | 3.8 | 4.3 | 6.6 | ||||
| RETEX-36 | 4.2 | 5.1 | 5.7 | 8.8 | ||||
Usage Key:
- Faucet: Flow rate of 0.5 GPM
- Shower: Flow rate of 1.5 GPM
- Inlet Temp: The temperature of cold water before it enters your water heater.
- GPM: Gallons Per Minute
- Approx. Usage: Represents the number of faucets and/or showers a model can serve at a temperature setting of 105°F. Higher temperature settings will reduce flow rates.
