A. O. Smith UPVA-18K 1**
A. O. Smith UPVA-18K 1** is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.94 and a certified flow of 0.2 gal/min at a 67°F rise.
Its advertised flow of 0.2 gal/min at a 67°F rise from A. O. Smith matches the certified 0.2 gal/min at a 67°F rise (Read Oct 4, 2026).
- Electric tankless water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Certified and advertised figures
- Flow at a 67°F rise
- 0.2gallons per minuteCertified
- Advertised flow
- 0.2gallons per minuteA. O. Smith, at a 67°F rise
- UEF
- 0.94Uniform 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 0.2 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.
Advertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| UEF | 0.94 | 0.94 | A. O. Smith | Read Oct 4, 2026 |
| Flow | 0.2 gal/min at a 67°F rise | 0.2 gal/min at a 67°F rise | A. O. Smith | Read Oct 4, 2026 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| UPVA-18K 1** | 0.94 | 0.2 | 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 0.2 gallons per minute. The median flow among electric tankless models is 0.7 gallons per minute. Of 337 electric tankless models, 320 have a higher flow than this one.
In tests, 94% of the energy it uses ends up as hot water (UEF 0.94). Its test ran at the very small level of daily hot water use. Among 272 electric tankless models on its draw pattern, 187 have a higher UEF. A UEF of 0.96 is the median for its type and draw pattern. When it runs, 98% of the energy it uses reaches the water (its recovery efficiency).
There is one more basic model with the same test figures. That one is listed under the State brand.
Also listed as
They carry every figure in the table above.
- Every A. O. Smith basic model
- Every electric tankless water heater certified below 1.0 gallon per minute
- Every electric tankless water heater
Not covered
- Changes to an advertised figure after the date beside it.