Bradford White RTGR150N1 vs Navien NPE-180S2
The Bradford White RTGR150N1 is the more efficient unit: UEF 0.98 versus 0.96 — about 2% less energy for the same hot water. At national average rates that works out to about $251/year for the Bradford White RTGR150N1 against $255/year for the Navien NPE-180S2 — a $4 annual difference. The Navien NPE-180S2 sustains the higher flow (4.4 GPM vs 4.3 GPM under the DOE test).
| Bradford White RTGR150N1 | Navien NPE-180S2 | |
|---|---|---|
| Uniform Energy Factor (UEF) | 0.98 | 0.96 |
| Fuel | Natural Gas | Natural Gas, Propane |
| Max flow rate | 4.3 GPM | 4.4 GPM |
| Draw pattern | High | High |
| Annual gas use (natural gas) | 173 therms/yr | 176 therms/yr |
| Gas input rate | 150 kBTU/h | 150 kBTU/h |
| Max current draw | 2 A | 5 A |
| Vent type | Power Direct Vent | Power Direct Vent |
| Recovery efficiency | 98 % | — |
| Smart / connected capable | No | No |
| Minimum activation flow | 0.5 GPM | 1 GPM |
| Annual propane use | 189.07 gal/yr | 192.35 gal/yr |
| Vent size | 2 / 3 | 2 |
| Height | — | 27 in |
| Width | 17.3 in | 17 in |
| Depth | 14.8 in | 13 in |
| ENERGY STAR certified | Yes | Yes |
Frequently asked questions
Which costs less to run, the Bradford White RTGR150N1 or the Navien NPE-180S2?
The Bradford White RTGR150N1: about $251/year versus $255/year for the Navien NPE-180S2 at national average rates — a $4 annual difference.
Are the Bradford White RTGR150N1 and Navien NPE-180S2 both ENERGY STAR certified?
Yes — every water heater in this database is drawn from the U.S. EPA ENERGY STAR certified water heater datasets.