EEMAX ECO27
EEMAX ECO27 is in the DOE listing as of Oct 19, 2026.
- Electric tankless water heater
- 3 listed models
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
- 5.3gallons per minuteLowe's, 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 2.4 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 | 5.3 gal/min, no rise stated | 2.5 gal/min at a 67°F rise | Lowe's | Archived copy, Apr 22, 2026 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| EEM24027 | 0.93 | 2.5 | 98% | — |
| HA027240 | 0.93 | 2.5 | 98% | — |
| PR027240 | 0.93 | 2.5 | 98% | — |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 2.5 gallons per minute of water by 67°F in the test. The median electric tankless model heats 0.7 gallons per minute by 67°F. Its flow at a 67°F rise trails 13 of the 337 electric tankless models.
In tests, 93% of the energy went to hot water, so its UEF is 0.93. Of the energy it spends heating water, 98% ends up in it (its recovery efficiency).
It is the basic model for EEM24027, HA027240, and PR027240. Its test figures match those of 2 other basic models. The ECOSMART and Rheem brands list one or more of them. You can find the whole group on the page for the Rheem ECO27.
Also listed as
They carry every figure in the table above.
- Every EEMAX 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.