Mizudo FDG-CF170
Mizudo FDG-CF170 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 Rinnai RE180E (REU-VE2432WD-US).
Certified figures
- Flow at a 67°F rise
- 4.2gallons per minute
- UEF
- 0.82Uniform 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 4.0 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 |
|---|---|---|---|---|
| FDG-CF170AW-LP | 0.82 | 4.2 | 82% | High |
| FDG-CF170AW-NG | 0.82 | 4.2 | 82% | High |
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 4.2 gallons per minute. The gas tankless type has a median flow of 4.8 gallons per minute. Among 487 gas tankless models, 360 give more flow at a 67°F rise.
It was not listed as ENERGY STAR certified on Oct 19, 2026. In tests, 82% of the energy went to hot water, so its UEF is 0.82. The daily hot water use in the test, called its draw pattern, was high. Its UEF is lower than that of 243 of the 399 gas tankless models with its draw pattern. On its draw pattern, the median gas tankless UEF is 0.93. Of the energy it spends heating water, 82% ends up in it (its recovery efficiency).
Its 2 model numbers are FDG-CF170AW-LP and FDG-CF170AW-NG. Its test figures match those of 2 other basic models. Of those, one or more are under the Fogatti and Rinnai brands. You can find the whole group on the page for the Rinnai RE180E (REU-VE2432WD-US).
It may qualify for one rebate program if it meets their other terms.
Also listed as
They carry every figure in the table above.
Rebates
| Program | State | Status | Program page |
|---|---|---|---|
| SoCalGas High-Efficiency or ENERGY STAR Certified Natural Gas Tankless Water Heaters rebate | CA | May qualify if it meets the other terms | Its own page |
Programs change their terms. Check the program's own page before you buy.
- Every Mizudo 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.