A. O. Smith UPVA-55E 1**
A. O. Smith UPVA-55E 1** is in the DOE listing as of Oct 19, 2026.
- Electric tankless water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Its figures are also listed under A. O. Smith UPVA-45E 1**.
Certified and advertised figures
- Flow at a 67°F rise
- 0.5gallons per minuteCertified
- Advertised flow
- 0.5gallons per minuteA. O. Smith, at a 67°F rise
- UEF
- 0.92Uniform 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 0.5 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 | 0.92 | 0.92 | A. O. Smith | Read Oct 4, 2026 |
| Flow | 0.5 gal/min at a 67°F rise | 0.5 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-55E 1** | 0.92 | 0.5 | 98% | Very small |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 0.5 gallons per minute of water by 67°F in the test. The electric tankless type has a median flow of 0.7 gallons per minute. Its flow at a 67°F rise trails 204 of the 337 electric tankless models.
In tests, 92% of the energy went to hot water, so its UEF is 0.92. 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, 249 have a higher UEF and 7 a lower one. For its type and draw pattern, the median UEF is 0.96. While it heats water, 98% of the energy used goes into the water (its recovery efficiency).
All of its test figures are shared by 4 other basic models. The RELIANCE WATER HEATERS and State brands list one or more of them. For the full group, see the A. O. Smith UPVA-45E 1** page.
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.