Fogatti FDG-CF170
Fogatti FDG-CF170 is in the DOE listing as of Oct 19, 2026.
- Gas tankless water heater
- 4 listed models
Not listed as ENERGY STAR certified on Oct 19, 2026.
Its figures are also listed under Rinnai RE180E (REU-VE2432WD-US).
Certified and advertised figures
- Flow at a 67°F rise
- 4.2gallons per minuteCertified
- Advertised flow
- 8.03gallons per minuteThe Home Depot, no rise stated
- UEF
- 0.82Uniform 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 4.0 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.
Advertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| UEF | 0.81 | 0.82 | The Home Depot | Archived copy, Jan 14, 2025 |
| Flow | 8.03 gal/min, no rise stated | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 14, 2025 |
| Flow | 7.5 gal/min, no rise stated | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 14, 2025 |
| Flow | 8.03 gal/min at a 35°F rise | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 14, 2025 |
| Flow | 6.2 gal/min at a 45°F rise | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 14, 2025 |
| Flow | 5.1 gal/min at a 55°F rise | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 14, 2025 |
| Flow | 4.31 gal/min at a 65°F rise | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 14, 2025 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| FDG-CF170G-LP | 0.82 | 4.2 | 82% | High |
| FDG-CF170G-NG | 0.82 | 4.2 | 82% | High |
| FDG-CF170W-LP | 0.82 | 4.2 | 82% | High |
| FDG-CF170W-NG | 0.82 | 4.2 | 82% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
It warms 4.2 gallons per minute of water from 58°F to 125°F in the test. The median gas tankless model heats 4.8 gallons per minute by 67°F. Its flow at a 67°F rise trails 360 of the 487 gas tankless models.
As of Oct 19, 2026, it was not listed as ENERGY STAR certified. In tests, 82% of the energy it uses ends up as hot water (UEF 0.82). Its test simulated a day of high hot water use (its draw pattern). Of 399 gas tankless models with the same draw pattern, 243 have a higher UEF and 72 a lower one. For its type and draw pattern, the UEF runs from 0.81 to 0.98. When it runs, 82% of the energy it uses reaches the water (its recovery efficiency).
It is sold under 4 model numbers in all. There are 2 more basic models with the same test figures. Those basic models are sold with Mizudo and Rinnai as their brand names. For the full group, see 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 Fogatti 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
- Changes to an advertised figure after the date beside it.