State ATI-140B-N 1**
State ATI-140B-N 1** is in the DOE listing as of Oct 19, 2026.
- Gas tankless water heater
- 2 listed models
Not listed as ENERGY STAR certified on Oct 19, 2026.
Its figures are also listed under A. O. Smith ATI-140B-N 1**.
Certified figures
- Flow at a 67°F rise
- 3.6gallons per minute
- UEF
- 0.81Uniform 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 3.4 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 |
|---|---|---|---|---|
| STI-140B-N | 0.81 | 3.6 | 84% | Medium |
| STI-140X3-N | 0.81 | 3.6 | 84% | Medium |
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 3.6 gallons per minute. The gas tankless type has a median flow of 4.8 gallons per minute. Its flow at a 67°F rise trails 409 of the 487 gas tankless models.
On Oct 19, 2026, this heater was not listed as ENERGY STAR certified. In tests, 81% of the energy went to hot water, so its UEF is 0.81. The daily hot water use in the test, called its draw pattern, was medium. Its UEF is lower than that of 48 of the 77 gas tankless models with its draw pattern. For its type and draw pattern, the UEF runs from 0.81 to 0.97. Of the energy it spends heating water, 84% ends up in it (its recovery efficiency).
Its 2 model numbers are STI-140B-N and STI-140X3-N. There are 10 more basic models with the same test figures. In all, 4 other brands list one or more of them. You can find the whole group on the page for the A. O. Smith ATI-140B-N 1**.
Also listed as
They carry every figure in the table above.
- Every State basic model
- Every gas tankless water heater certified below 4.0 gallons per minute
- Every gas tankless water heater
- The most-searched gas tankless models side by side
Not covered
- Advertised figures. We have none on file for this model.