Navien NHW700-180SE-NG
Navien NHW700-180SE-NG 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 A. O. Smith TK-310U-I 2**.
Certified and advertised figures
- Flow at a 67°F rise
- 4.7gallons per minuteCertified
- Advertised flow
- 4.7gallons per minuteNavien, at a 67°F rise
- UEF
- 0.81Uniform 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 4.5 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 | 0.81 | Navien | Read Oct 4, 2026 |
| Flow | 4.7 gal/min at a 67°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 10.0 gal/min at a 30°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 8.5 gal/min at a 35°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 7.5 gal/min at a 40°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 6.6 gal/min at a 45°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 6.0 gal/min at a 50°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 5.4 gal/min at a 55°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 5.0 gal/min at a 60°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 4.6 gal/min at a 65°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 4.3 gal/min at a 70°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 4.0 gal/min at a 75°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 3.7 gal/min at a 80°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 3.5 gal/min at a 85°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 3.3 gal/min at a 90°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 3.0 gal/min at a 100°F rise | 4.7 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| NHW700-180SE-LP | 0.81 | 4.7 | 84% | High |
| NHW700-180SE-NG | 0.81 | 4.7 | 84% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 4.7 gallons per minute of water by 67°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 252 of the 487 gas tankless models.
It was not listed as ENERGY STAR certified on Oct 19, 2026. In tests, 81% of the energy it uses ends up as hot water (UEF 0.81). In the test, daily hot water use was set to high (its draw pattern). Among 399 gas tankless models on its draw pattern, 327 have a higher UEF. On its draw pattern, the median gas tankless UEF is 0.93. Of the energy it spends heating water, 84% ends up in it (its recovery efficiency).
It is sold as NHW700-180SE-LP and NHW700-180SE-NG. All of its test figures are shared by 5 other basic models. Each of the 5 other brands lists one of them. For the full group, see the A. O. Smith TK-310U-I 2** page.
Also listed as
They carry every figure in the table above.
- Every Navien 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.