Navien NHW700-199SE-NG
Navien NHW700-199SE-NG is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.81 and a certified flow of 5.1 gal/min at a 67°F rise.
Its certified flow is 5.1 gal/min at a 67°F rise, while Navien advertises 11.1 gal/min at a 30°F rise (Read Oct 4, 2026), so the two figures are not at the same 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
- 5.1gallons per minute
- 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 4.9 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 | 11.1 gal/min at a 30°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 9.5 gal/min at a 35°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 8.3 gal/min at a 40°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 7.4 gal/min at a 45°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 6.6 gal/min at a 50°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 6.0 gal/min at a 55°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 5.5 gal/min at a 60°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 5.1 gal/min at a 65°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 5.1 gal/min at a 67°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 4.7 gal/min at a 70°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 4.4 gal/min at a 75°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 4.1 gal/min at a 80°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 3.9 gal/min at a 85°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 3.7 gal/min at a 90°F rise | 5.1 gal/min at a 67°F rise | Navien | Read Oct 4, 2026 |
| Flow | 3.3 gal/min at a 100°F rise | 5.1 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 |
|---|---|---|---|---|
| NHW700-199SE-LP | 0.81 | 5.1 | 84% | High |
| NHW700-199SE-NG | 0.81 | 5.1 | 84% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
At a 67°F rise, its flow in the test is 5.1 gallons per minute. The gas tankless type has a median flow of 4.8 gallons per minute. Among 487 gas tankless models, 167 give more flow at a 67°F rise.
As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In the test, 19% of its energy does not reach the hot water (UEF 0.81). The daily hot water use in the test, called its draw pattern, was high. Its UEF is lower than that of 327 of the 399 gas tankless models with its draw pattern. For its type and draw pattern, the median UEF is 0.93. Of the energy it spends heating water, 84% ends up in it (its recovery efficiency).
It is the basic model for NHW700-199SE-LP and NHW700-199SE-NG. All of its test figures are shared by one other basic model.
Also listed as
They carry every figure in the table above.
- Every Navien basic model
- Every gas tankless water heater certified at 5.0 to 5.9 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.