ECOSMART ECO24
ECOSMART ECO24 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 ECO24.
Certified and advertised figures
- Flow at a 67°F rise
- 2.4gallons per minuteCertified
- Advertised flow
- 5.8gallons per minuteThe Home Depot, no rise stated
- UEF
- 0.93Uniform 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 2.3 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 | 5.8 gal/min, no rise stated | 2.4 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 24, 2025 |
| Flow | 4.68 gal/min at a 35°F rise | 2.4 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 24, 2025 |
| Flow | 3.64 gal/min at a 45°F rise | 2.4 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 24, 2025 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| ECO24 | 0.93 | 2.4 | 98% | — |
UEF is the uniform energy factor. A dash means the model has no such figure.
It warms 2.4 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 21 of the 337 electric tankless models.
In tests, 93% of the energy it uses ends up as hot water (UEF 0.93). Of the energy it spends heating water, 98% ends up in it (its recovery efficiency).
There are 2 more basic models with the same test figures. Those basic models are sold with EEMAX and Rheem as their brand names. You can find the whole group on the page for the Rheem ECO24.
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.