ECOSMART ECO27
ECOSMART ECO27 is in the DOE listing as of Oct 19, 2026.
- Electric tankless water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Its figures are also listed under Rheem ECO27.
Certified and advertised figures
- Flow at a 67°F rise
- 2.5gallons per minuteCertified
- Advertised flow
- 6.5gallons per minuteThe Home Depot, up to, no rise stated
- UEF
- 0.93Uniform energy factor
Your fixtures at once
Change your hour and flowFlow where you live
The heater gives less flow when colder incoming water needs a bigger rise.
- 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 2.4 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 |
|---|---|---|---|---|
| Flow | up to 6.5 gal/min, no rise stated | 2.5 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 13, 2025 |
| Flow | 5.27 gal/min, no rise stated | 2.5 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 13, 2025 |
| Flow | 5.27 gal/min at a 35°F rise | 2.5 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 13, 2025 |
| Flow | 4.1 gal/min at a 45°F rise | 2.5 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 13, 2025 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| ECO27 | 0.93 | 2.5 | 98% | — |
UEF is the uniform energy factor. A dash means the model has no such figure.
It warms 2.5 gallons per minute of water from 58°F to 125°F in the test. The median electric tankless model heats 0.7 gallons per minute by 67°F. Among 337 electric tankless models, 13 give more flow at a 67°F rise.
In the test, 7% of its energy does not reach the hot water (UEF 0.93). While it heats water, 98% of the energy used goes into the water (its recovery efficiency).
All of its test figures are shared by 2 other basic models. Of those, one or more are under the EEMAX and Rheem brands. For the full group, see the Rheem ECO27 page.
Also listed as
They carry every figure in the table above.
- Every ECOSMART basic model
- Every electric tankless water heater certified at 2.0 gallons per minute or more
- Every electric tankless water heater
Not covered
- Changes to an advertised figure after the date beside it.