A. O. Smith ATHR-180M 1 vs Noritz EZ98DV (GQ-C2861WX-FF-1 US)
The Noritz EZ98DV (GQ-C2861WX-FF-1 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 Noritz EZ98DV (GQ-C2861WX-FF-1 US) against $258/year for the A. O. Smith ATHR-180M 1 — a $7 annual difference.
| A. O. Smith ATHR-180M 1 | Noritz EZ98DV (GQ-C2861WX-FF-1 US) | |
|---|---|---|
| Uniform Energy Factor (UEF) | 0.95 | 0.98 |
| 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) | 178 therms/yr | 173 therms/yr |
| Gas input rate | 180 kBTU/h | 180 kBTU/h |
| Max current draw | 5 A | 0.7 A |
| Vent type | Power Vent, Power Direct Vent | Power Direct Vent |
| Recovery efficiency | 97 % | 99 % |
| Smart / connected capable | No | No |
| Minimum activation flow | 1 GPM | 0.4 GPM |
| Annual propane use | 194.53 gal/yr | 189.07 gal/yr |
| Vent size | 3 / 2 | 2 / 3 |
| Height | — | 26.1 in |
| Diameter | — | 18.1 in |
| Width | 17 in | 18.1 in |
| Depth | 16 in | 11.8 in |
| ENERGY STAR certified | Yes | Yes |
Frequently asked questions
Which costs less to run, the A. O. Smith ATHR-180M 1 or the Noritz EZ98DV (GQ-C2861WX-FF-1 US)?
The Noritz EZ98DV (GQ-C2861WX-FF-1 US): about $251/year versus $258/year for the A. O. Smith ATHR-180M 1 at national average rates — a $7 annual difference.
Are the A. O. Smith ATHR-180M 1 and Noritz EZ98DV (GQ-C2861WX-FF-1 US) both ENERGY STAR certified?
Yes — every water heater in this database is drawn from the U.S. EPA ENERGY STAR certified water heater datasets.