Takagi TK-110U-E 2**
Takagi TK-110U-E 2** is in the DOE listing as of Oct 19, 2026.
- Gas tankless water heater
- 1 listed model
Not listed as ENERGY STAR certified on Oct 19, 2026.
Its figures are also listed under A. O. Smith TK-110U-E 2**.
Certified and advertised figures
- Flow at a 67°F rise
- 3.5gallons per minuteCertified
- Advertised flow
- 6.6gallons per minuteSupplyHouse, at a 35°F rise
- UEF
- 0.81Uniform energy factor
Your fixtures at once
Change your hour and flowFlow where you live
Colder incoming water needs a bigger rise, so the heater gives 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 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.
Advertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Flow | 6.6 gal/min at a 35°F rise | 3.5 gal/min at a 67°F rise | SupplyHouse | Archived copy, Apr 18, 2025 |
| Flow | 3.3 gal/min at a 70°F rise | 3.5 gal/min at a 67°F rise | SupplyHouse | Archived copy, Apr 18, 2025 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| TK-110U-E 2** | 0.81 | 3.5 | 83% | 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 3.5 gallons per minute. The gas tankless type has a median flow of 4.8 gallons per minute. Among 487 gas tankless models, 426 give more flow at a 67°F rise.
As of Oct 19, 2026, it 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, 83% ends up in it (its recovery efficiency).
All of its test figures are shared by 6 other basic models. Each of them is listed under a different brand. For the full group, see the A. O. Smith TK-110U-E 2** page.
Also listed as
They carry every figure in the table above.
- Every Takagi 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
- Changes to an advertised figure after the date beside it.