Noritz NR501-OD-LP
Noritz NR501-OD-LP is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.82 and a certified flow of 3.1 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
- 3.1gallons per minute
- 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 3.0 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 |
|---|---|---|---|---|
| NR501-OD-LP | 0.82 | 3.1 | 84% | Medium |
| NR501-OD-NG | 0.82 | 3.1 | 84% | Medium |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 3.1 gallons per minute of water by 67°F in the test. The gas tankless type has a median flow of 4.8 gallons per minute. Among 487 gas tankless models, 465 give more flow at a 67°F rise.
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 medium level of daily hot water use. Among 77 gas tankless models on its draw pattern, 30 have a higher UEF. For its type and draw pattern, its UEF sits at the median. While it heats water, 84% of the energy used goes into the water (its recovery efficiency).
It is sold as NR501-OD-LP and NR501-OD-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 Noritz 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.