Rheem ECO POU 6
Rheem ECO POU 6 is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.94 and a certified flow of 0.5 gal/min at a 67°F rise.
Its certified flow is 0.5 gal/min at a 67°F rise, while Rheem advertises 1.5 gal/min, no rise stated (Read Oct 4, 2026), so a comparison at the same rise is not possible.
- Electric tankless water heater
- 6 listed models
ENERGY STAR certification does not cover this type of water heater.
Certified and advertised figures
- Flow at a 67°F rise
- 0.5gallons per minuteCertified
- Advertised flow
- 1.5gallons per minuteRheem, no rise stated
- UEF
- 0.94Uniform energy factor
Your fixtures at once
Change your hour and flowFlow where you live
Colder incoming water needs a bigger rise, so the heater gives less flow.
- Cold water
- Cold water must be at least 10°F colder than the hot water setting.
- Flow estimate
- The estimate uses the lowest certified flow among the listed models. It is about 0.5 gal/min at a 70°F rise.
Flow limits
- The estimate excludes the flow needed to turn the heater on, heat lost in pipes, and installation.
- Cold water from a well or long pipe run can differ from the temperature you enter.
- Without a stated flow limit, estimates for warmer water may exceed the heater’s actual flow.
Advertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| UEF | 0.94 | 0.94 | The Home Depot | Archived copy, May 20, 2025 |
| Flow | 1.5 gal/min, no rise stated | 0.5 gal/min at a 67°F rise | Rheem | Read Oct 4, 2026 |
| Flow | 1.6 gal/min, no rise stated | 0.5 gal/min at a 67°F rise | The Home Depot | Archived copy, May 20, 2025 |
| Flow | 1.27 gal/min, no rise stated | 0.5 gal/min at a 67°F rise | The Home Depot | Archived copy, May 20, 2025 |
| Flow | 1.27 gal/min at a 35°F rise | 0.5 gal/min at a 67°F rise | The Home Depot | Archived copy, May 20, 2025 |
| Flow | 0.99 gal/min at a 45°F rise | 0.5 gal/min at a 67°F rise | The Home Depot | Archived copy, May 20, 2025 |
| Flow | 0.81 gal/min at a 55°F rise | 0.5 gal/min at a 67°F rise | The Home Depot | Archived copy, May 20, 2025 |
| Flow | 0.68 gal/min at a 65°F rise | 0.5 gal/min at a 67°F rise | The Home Depot | Archived copy, May 20, 2025 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| RETEX-06 | 0.94 | 0.5 | 98% | Very small |
| RETEX-06T | 0.94 | 0.5 | 98% | Very small |
| RMTEX-06 | 0.94 | 0.5 | 98% | Very small |
| RMTEX-06T | 0.94 | 0.5 | 98% | Very small |
| RTEX-06 | 0.94 | 0.5 | 98% | Very small |
| RTEX-06T | 0.94 | 0.5 | 98% | Very small |
UEF is the uniform energy factor. A dash means the model has no such figure.
It warms 0.5 gallons per minute of water from 58°F to 125°F in the test. The median flow among electric tankless models is 0.7 gallons per minute. Its flow at a 67°F rise trails 204 of the 337 electric tankless models.
In the test, 6% of its energy does not reach the hot water (UEF 0.94). Its test ran at the very small level of daily hot water use. Of 272 electric tankless models with the same draw pattern, 187 have a higher UEF. A UEF of 0.96 is the median for its type and draw pattern. When it runs, 98% of the energy it uses reaches the water (its recovery efficiency).
It is sold under 6 model numbers in all. Its test figures match those of 2 other basic models. Those basic models are sold with ECOSMART and EEMAX as their brand names.
Also listed as
They carry every figure in the table above.
- Every Rheem basic model
- Every electric tankless water heater certified below 1.0 gallon per minute
- Every electric tankless water heater
Not covered
- Changes to an advertised figure after the date beside it.