Westinghouse HW180
Westinghouse HW180 is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.82 and a certified flow of 4.2–4.5 gal/min at a 67°F rise.
- Gas tankless water heater
- 2 listed models
Not listed as ENERGY STAR certified on Oct 26, 2026.
Certified figures
- Flow at a 67°F rise
- 4.2–4.5gallons per minute
- UEF
- 0.82Uniform 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
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 |
|---|---|---|---|---|
| HW180A0G-LP | 0.82 | 4.2 | 82% | High |
| HW180A0G-NG | 0.82 | 4.5 | 82% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
Its flow at a 67°F rise is 4.2 to 4.5 gallons per minute, by model number. The gas tankless type has a median flow of 4.8 gallons per minute. Its flow at a 67°F rise trails 319 of the 487 gas tankless models.
On Oct 26, 2026, this heater 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 ran at the high level of daily hot water use. Its UEF is lower than that of 243 of the 399 gas tankless models with its draw pattern. 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).
Its 2 model numbers are HW180A0G-LP and HW180A0G-NG.
In one state, one rebate program may accept it if it meets their other terms.
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 Westinghouse 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.