Takagi TK-310CX3 1**
Takagi TK-310CX3 1** 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-310CX3 1**.
Certified figures
- Flow at a 67°F rise
- 4.7gallons 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 4.5 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.
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| TK-310CX3 1** | 0.81 | 4.7 | 83% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
It warms 4.7 gallons per minute of water from 58°F to 125°F in the test. The median flow among gas tankless models is 4.8 gallons per minute. Among 487 gas tankless models, 252 give more flow at a 67°F rise.
It was not listed as ENERGY STAR certified on Oct 19, 2026. In tests, 81% of the energy it uses ends up as hot water (UEF 0.81). Its test simulated a day of high hot water use (its draw pattern). Among 399 gas tankless models on its draw pattern, 327 have a higher UEF. A UEF of 0.93 is the median for its type and draw pattern. When it runs, 83% of the energy it uses reaches the water (its recovery efficiency).
There are 5 more basic models with the same test figures. They are listed under 5 other brands, one each. You can find the whole group on the page for the A. O. Smith TK-310CX3 1**.
Also listed as
They carry every figure in the table above.
- Every Takagi basic model
- Every gas tankless water heater certified at 4.0 to 4.9 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.