ECOSMART ECOS 27
ECOSMART ECOS 27 is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.91 and a certified flow of 2.6 gal/min at a 67°F rise.
Its certified flow is 2.6 gal/min at a 67°F rise, while The Home Depot advertises 6.6 gal/min, no rise stated (Archived copy, Aug 27, 2025), so a comparison at the same rise is not possible.
- Electric tankless water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Certified and advertised figures
- Flow at a 67°F rise
- 2.6gallons per minuteCertified
- Advertised flow
- 6.6gallons per minuteThe Home Depot, no rise stated
- UEF
- 0.91Uniform energy factor
Your fixtures at once
Change your hour and flowFlow where you live
A bigger rise from colder incoming water leaves the heater with 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 2.5 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 | 0.91 | The Home Depot | Archived copy, Aug 27, 2025 |
| Flow | 6.6 gal/min, no rise stated | 2.6 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 27, 2025 |
| Flow | up to 6.6 gal/min, no rise stated | 2.6 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 27, 2025 |
| Flow | 5.6 gal/min, no rise stated | 2.6 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 27, 2025 |
| Flow | 5.6 gal/min at a 35°F rise | 2.6 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 27, 2025 |
| Flow | 4.1 gal/min at a 45°F rise | 2.6 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 27, 2025 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| ECOS 27 | 0.91 | 2.6 | 98% | — |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 2.6 gallons per minute of water by 67°F in the test. The median flow among electric tankless models is 0.7 gallons per minute. Of 337 electric tankless models, 12 have a higher flow than this one.
In tests, 91% of the energy went to hot water, so its UEF is 0.91. While it heats water, 98% of the energy used goes into the water (its recovery efficiency).
- 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.