Stiebel Eltron Mini-E 4-2
Stiebel Eltron Mini-E 4-2 is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.98 and a certified flow of 0.4 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
- 0.4gallons per minute
- UEF
- 0.98Uniform 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 0.4 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 |
|---|---|---|---|---|
| Mini-E 4-2 | 0.98 | 0.4 | 98% | Very small |
UEF is the uniform energy factor. A dash means the model has no such figure.
At a 67°F rise, its flow in the test is 0.4 gallons per minute. The median flow among electric tankless models is 0.7 gallons per minute. Of 337 electric tankless models, 233 have a higher flow than this one.
In tests, 98% of the energy it uses ends up as hot water (UEF 0.98). Its test ran at the very small level of daily hot water use. Of 272 electric tankless models with the same draw pattern, 10 have a higher UEF. For its type and draw pattern, the median UEF is 0.96. When it runs, 98% of the energy it uses reaches the water (its recovery efficiency).
All of its test figures are shared by one other basic model. That one is listed under the Aquapower brand.
Also listed as
They carry every figure in the table above.
- Every Stiebel Eltron basic model
- Every electric tankless water heater certified below 1.0 gallon per minute
- Every electric tankless water heater
Not covered
- Advertised figures. We have none on file for this model.