Gas tankless water heaters side by side
The 7 most-searched gas tankless models, with the certified figures of each.
Warmed by 67°F, the slowest gives 4.6 gallons per minute and the fastest 5.8 gallons per minute. At the high end, 5.8 gallons per minute, more than one model ties. Among these models, the Rinnai (RX160I) REU-NB2530FF-US is the one at the low end. An advertised flow sits beside the certified one for 6 of these 7 models, in the table.
Each model here was tested on the high draw pattern, one simulated day of hot water use. Model by model, each unit of energy in gives 0.93 to 0.98 units of hot water energy out. ENERGY STAR certified status goes to 6 of these 7 models.
All 7 models here may qualify for at least one rebate program. Other basic models match every figure of 3 of these 7 models. In all, the figures here belong to 13 basic models.
Every gas tankless model by efficiency and flow
Up is more flow, warmed by 67°F in the test. Right is more efficient. A UEF compares only between models tested on the same draw pattern, so the chart shows one pattern at a time, the most common first.
Certified figures
In order of flow, lowest first, then UEF, highest first.
| Figure | Rinnai (RX160I) REU-NB2530FF-US | Noritz NCC199CDV (GQ-C3261WZ-FF US) | Rheem RTGH-95DVLN-3 | Noritz EZ111DV (GQ-C3260WX-FF US) | Navien NPE-240A2 | Rinnai (RX199I) REU-NB3237FF-US | Navien NPE-240S2 |
|---|---|---|---|---|---|---|---|
| Flow at a 67°F rise (gal/min) | 4.6 | 5.5 | 5.5 | 5.6 | 5.6 | 5.8 | 5.8 |
| Advertised flow (gal/min) | 9.0 Lowe's, no rise stated | 9.2 Noritz, no rise stated | 9.5 Rheem, no rise stated | — | 5.6 Navien, at a 67°F rise | 11.1 Lowe's, no rise stated | 11.2 Navien, at a 35°F rise |
| UEF | 0.97 | 0.98 | 0.93 | 0.96 | 0.95 | 0.98 | 0.96 |
| Draw pattern | High | High | High | High | High | High | High |
| Recovery efficiency | 98% | 98% | 95% | 98% | 98% | 99% | 99% |
| ENERGY STAR | Certified | Certified | — | Certified | Certified | Certified | Certified |
| Listed models | 4 | 6 | 6 | 4 | 1 | 4 | 1 |
| Rebate programs (may qualify) | 6 | 6 | 2 | 6 | 6 | 6 | 6 |
| Also listed as | — | — | 3 basic models | 2 basic models | — | — | 1 basic model |
UEF is the uniform energy factor. A UEF compares only between models with the same draw pattern. A range means the listed models differ. A dash means no such figure, or not listed as ENERGY STAR certified.
Also listed as
Rheem RTGH-95DVLN-3
Noritz EZ111DV (GQ-C3260WX-FF US)
Navien NPE-240S2
Each carries every figure in its column.
Every gas tankless water heater with its certified figures
Not covered
- Price, warranty, and installation.
- Models searched for less often. Each one is on the full list.