EEMAX ECO36
EEMAX ECO36 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 ECO36.
Certified figures
- Flow at a 67°F rise
- 3.5gallons per minute
- UEF
- 0.94Uniform 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 3.4 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.
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| EEM24036 | 0.94 | 3.5 | 98% | — |
| HA036240 | 0.94 | 3.5 | 98% | — |
| PR036240 | 0.94 | 3.5 | 98% | — |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 3.5 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 2 of the 337 electric tankless models.
In tests, 94% of the energy it uses ends up as hot water (UEF 0.94). While it heats water, 98% of the energy used goes into the water (its recovery efficiency).
It is sold as EEM24036, HA036240, and PR036240. Its test figures match those of 2 other basic models. The ECOSMART and Rheem brands list one or more of them. For the full group, see the Rheem ECO36 page.
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
- Advertised figures. We have none on file for this model.