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Chronomite M

Chronomite M is in the DOE listing as of Oct 26, 2026.

It has a certified UEF of 0.94 and a certified flow of 1.1 gal/min at a 67°F rise.

  • Electric tankless water heater
  • 1 listed model

ENERGY STAR certification does not cover this type of water heater.

Flow at a 67°F rise
1.1gallons per minute
UEF
0.94Uniform energy factor
See it among every electric tankless model

Flow 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.

Certified figures by listed model

Model numberUEFFlow at a 67°F rise (gal/min)Recovery efficiencyDraw pattern
M-40/2770.941.196%Very small

UEF is the uniform energy factor. A dash means the model has no such figure.

It heats 1.1 gallons per minute of water by 67°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 82 of the 337 electric tankless models.

In the test, 6% of its energy does not reach the hot water (UEF 0.94). 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, 187 have a higher UEF. For its type and draw pattern, the median UEF is 0.96. When it runs, 96% of the energy it uses reaches the water (its recovery efficiency).

Updated Oct 26, 2026 · Methodology

Not covered

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