Mizudo FDG-CS120S
Mizudo FDG-CS120S 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 Fogatti FDG-CS120S.
Certified figures
- Flow at a 67°F rise
- 2.9–3.3gallons per minute
- UEF
- 0.82–0.83Uniform energy factor
The 2 listed models differ. A range runs from the lowest figure to the highest.
Your fixtures at once
Change your hour and flowFlow where you live
A bigger rise from colder incoming water leaves the heater with 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 2.8 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 |
|---|---|---|---|---|
| FDG-CS120SBW-LP | 0.83 | 3.3 | 85% | Medium |
| FDG-CS120SBW-NG | 0.82 | 2.9 | 82% | Medium |
UEF is the uniform energy factor. A dash means the model has no such figure.
Its flow at a 67°F rise is 2.9 to 3.3 gallons per minute, by model number. The gas tankless type has a median flow of 4.8 gallons per minute. Of 487 gas tankless models, 451 have a higher flow than this one.
It was not listed as ENERGY STAR certified on Oct 19, 2026. Its listed models turn 82 to 83% of the energy used into hot water (UEF 0.82 to 0.83). Its test ran at the medium level of daily hot water use. Among 77 gas tankless models on its draw pattern, 26 have a higher UEF. For its type and draw pattern, the median UEF is 0.82.
It is the basic model for FDG-CS120SBW-LP and FDG-CS120SBW-NG. All of its test figures are shared by 2 other basic models. Those basic models are sold with Fogatti and Westinghouse as their brand names. For the full group, see the Fogatti FDG-CS120S page.
In one state, one rebate program may accept it 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 below 4.0 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.