Takagi TK-510CX3 1**
Takagi TK-510CX3 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-510CX3 1**.
Certified figures
- Flow at a 67°F rise
- 5.0gallons per minute
- 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 4.8 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-510CX3 1** | 0.81 | 5.0 | 83% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 5.0 gallons per minute of water by 67°F in the test. The gas tankless type has a median flow of 4.8 gallons per minute. Among 487 gas tankless models, 176 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. Its test ran at the high level of daily hot water use. Of 399 gas tankless models with the same draw pattern, 327 have a higher UEF. On its draw pattern, the median gas tankless UEF is 0.93. While it heats water, 83% of the energy used goes into the water (its recovery efficiency).
Its test figures match those of 5 other basic models. Each of the 5 other brands lists one of them. You can find the whole group on the page for the A. O. Smith TK-510CX3 1**.
Also listed as
They carry every figure in the table above.
- Every Takagi basic model
- Every gas tankless water heater certified at 5.0 to 5.9 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.