Rinnai RE180E (REU-VE2432WD-US)
Rinnai RE180E (REU-VE2432WD-US) 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 gal/min at a 67°F rise.
Its certified flow is 4.2 gal/min at a 67°F rise, while The Home Depot advertises 8.5 gal/min at a 35°F rise (Archived copy, Jan 20, 2025), so the two figures are not at the same rise.
- Gas tankless water heater
- 1 listed model
Not listed as ENERGY STAR certified on Oct 26, 2026.
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
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 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 | 0.82 | 0.82 | SupplyHouse | Archived copy, Mar 24, 2023 |
| UEF | 0.82 | 0.82 | The Home Depot | Archived copy, Jan 20, 2025 |
| Flow | 8.5 gal/min at a 35°F rise | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 20, 2025 |
| Flow | 6.6 gal/min at a 45°F rise | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 20, 2025 |
| Flow | 5.4 gal/min at a 55°F rise | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 20, 2025 |
| Flow | 4.6 gal/min at a 65°F rise | 4.2 gal/min at a 67°F rise | The Home Depot | Archived copy, Jan 20, 2025 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| RE180E (REU-VE2432WD-US) | 0.82 | 4.2 | 82% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 4.2 gallons per minute of water by 67°F in the test. The median flow among gas tankless models is 4.8 gallons per minute. Of 487 gas tankless models, 360 have a higher flow than this one.
It was not listed as ENERGY STAR certified on Oct 26, 2026. In tests, 82% of the energy it uses ends up as hot water (UEF 0.82). In the test, daily hot water use was set to high (its draw pattern). Among 399 gas tankless models on its draw pattern, 243 have a higher UEF. For its type and draw pattern, the median UEF is 0.93. While it heats water, 82% of the energy used goes into the water (its recovery efficiency).
All of its test figures are shared by 2 other basic models. Of those, one or more are under the Fogatti and Mizudo brands.
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 Rinnai 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.