Rinnai RX180I REU-NB2934FF-US vs State ATHR-180M 1 (STHR-180M 1)
The Rinnai RX180I REU-NB2934FF-US is the more efficient unit: UEF 0.98 versus 0.95 — about 3% less energy for the same hot water. At national average rates that works out to about $251/year for the Rinnai RX180I REU-NB2934FF-US against $258/year for the State ATHR-180M 1 (STHR-180M 1) — a $7 annual difference.
| Rinnai RX180I REU-NB2934FF-US | State ATHR-180M 1 (STHR-180M 1) | |
|---|---|---|
| Uniform Energy Factor (UEF) | 0.98 | 0.95 |
| Fuel | Natural Gas, Propane | Natural Gas, Propane |
| Max flow rate | 5.3 GPM | 5.3 GPM |
| Draw pattern | High | High |
| Annual gas use (natural gas) | 173 therms/yr | 178 therms/yr |
| Gas input rate | 180 kBTU/h | 180 kBTU/h |
| Max current draw | 4 A | 5 A |
| Vent type | Power Direct Vent | Power Vent, Power Direct Vent |
| Recovery efficiency | 98 % | 97 % |
| Smart / connected capable | No | No |
| Minimum activation flow | 0.1 GPM | 1 GPM |
| Annual propane use | 189.07 gal/yr | 194.53 gal/yr |
| Vent size | 2 | 3 / 2 |
| Height | 25.8 in | — |
| Diameter | 11.4 in | — |
| Width | 18.5 in | 17 in |
| Depth | 11.4 in | 16 in |
| ENERGY STAR certified | Yes | Yes |
Frequently asked questions
Which costs less to run, the Rinnai RX180I REU-NB2934FF-US or the State ATHR-180M 1 (STHR-180M 1)?
The Rinnai RX180I REU-NB2934FF-US: about $251/year versus $258/year for the State ATHR-180M 1 (STHR-180M 1) at national average rates — a $7 annual difference.
Are the Rinnai RX180I REU-NB2934FF-US and State ATHR-180M 1 (STHR-180M 1) both ENERGY STAR certified?
Yes — every water heater in this database is drawn from the U.S. EPA ENERGY STAR certified water heater datasets.