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EEMAX ECO24

EEMAX ECO24 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 ECO24.

Flow at a 67°F rise
2.4gallons per minute
UEF
0.93Uniform energy factor

Flow where you live

The heater gives less flow when colder incoming water needs a bigger rise.

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.

Certified figures by listed model

Model numberUEFFlow at a 67°F rise (gal/min)Recovery efficiencyDraw pattern
EEM240240.932.498%—
HA0242400.932.498%—
PR0242400.932.498%—

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 electric tankless model heats 0.7 gallons per minute by 67°F. Among 337 electric tankless models, 21 give more flow at a 67°F rise.

In tests, 93% of the energy it uses ends up as hot water (UEF 0.93). When it runs, 98% of the energy it uses reaches the water (its recovery efficiency).

Its 3 model numbers are EEM24024, HA024240, and PR024240. Its test figures match those of 2 other basic models. Of those, one or more are under the ECOSMART and Rheem brands. For the full group, see the Rheem ECO24.

Also listed as

They carry every figure in the table above.

Updated Oct 19, 2026 · Methodology

Not covered

  • Advertised figures. We have none on file for this model.