avalon A18TWH
avalon A18TWH is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.92 and a certified flow of 1.8 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
- 1.8gallons per minute
- UEF
- 0.92Uniform energy factor
Your fixtures at once
Change your hour and flowFlow where you live
A bigger rise from colder incoming water leaves the heater with 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 1.7 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 |
|---|---|---|---|---|
| A18TWH | 0.92 | 1.8 | 98% | — |
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 1.8 gallons per minute. The electric tankless type has a median flow of 0.7 gallons per minute. Among 337 electric tankless models, 33 give more flow at a 67°F rise.
In tests, 92% of the energy went to hot water, so its UEF is 0.92. When it runs, 98% of the energy it uses reaches the water (its recovery efficiency).
- Every avalon 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.