Chronomite R
Chronomite R is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.97 and a certified flow of 1.2 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.
Certified figures
- Flow at a 67°F rise
- 1.2gallons per minute
- UEF
- 0.97Uniform energy factor
Your fixtures at once
Change your hour and flowFlow 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 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 number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| R-48L/240 | 0.97 | 1.2 | 99% | Very small |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 1.2 gallons per minute of water by 67°F in the test. The median flow among electric tankless models is 0.7 gallons per minute. Among 337 electric tankless models, 64 give more flow at a 67°F rise.
In tests, 97% of the energy went to hot water, so its UEF is 0.97. Its test simulated a day of very small hot water use (its draw pattern). Of 272 electric tankless models with the same draw pattern, 37 have a higher UEF and 195 a lower one. For its type and draw pattern, the median UEF is 0.96. When it runs, 99% of the energy it uses reaches the water (its recovery efficiency).
- Every Chronomite basic model
- Every electric tankless water heater certified at 1.0 to 1.9 gallons per minute
- Every electric tankless water heater
Not covered
- Advertised figures. We have none on file for this model.