ECOSMART ECOS 12
ECOSMART ECOS 12 is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.95 and a certified flow of 1.2 gal/min at a 67°F rise.
Its certified flow is 1.2 gal/min at a 67°F rise, while The Home Depot advertises up to 3.1 gal/min, no rise stated (Archived copy, Aug 25, 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
- 1.2gallons per minuteCertified
- Advertised flow
- 3.1gallons per minuteThe Home Depot, up to, no rise stated
- UEF
- 0.95Uniform 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 1.1 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 | 0.95 | 0.95 | The Home Depot | Archived copy, Aug 25, 2025 |
| Flow | up to 3.1 gal/min, no rise stated | 1.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 25, 2025 |
| Flow | 2.5 gal/min at a 35°F rise | 1.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 25, 2025 |
| Flow | 1.82 gal/min at a 45°F rise | 1.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 25, 2025 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| ECOS 12 | 0.95 | 1.2 | 97% | Very small |
UEF is the uniform energy factor. A dash means the model has no such figure.
It warms 1.2 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. Among 337 electric tankless models, 64 give more flow at a 67°F rise.
In tests, 95% of the energy went to hot water, so its UEF is 0.95. In the test, daily hot water use was set to very small (its draw pattern). Of 272 electric tankless models with the same draw pattern, 151 have a higher UEF. On its draw pattern, the median electric tankless UEF is 0.96. When it runs, 97% of the energy it uses reaches the water (its recovery efficiency).
- Every ECOSMART basic model
- Every electric tankless water heater certified at 1.0 to 1.9 gallons per minute
- Every electric tankless water heater
Not covered
- Changes to an advertised figure after the date beside it.