Noritz EZ71DV (GQ-C2661WX-FF US)
Noritz EZ71DV (GQ-C2661WX-FF US) is a gas tankless water heater from Noritz rated 4.7 GPM at a 0.98 UEF.
| Uniform Energy Factor (UEF) | 0.98 |
|---|---|
| Annual gas use (natural gas) | 173 therms/yr |
| Recovery efficiency | 99 % |
| Annual propane use | 189.07 gal/yr |
| Fuel | Natural Gas, Propane |
|---|
| Max flow rate | 4.7 GPM |
|---|---|
| Draw pattern | High |
| Minimum activation flow | 0.4 GPM |
| Gas input rate | 160 kBTU/h |
|---|
| Max current draw | 0.5 A |
|---|---|
| Vent type | Power Direct Vent |
| Vent size | 2 / 3 |
| Smart / connected capable | No |
|---|
| Height | 26.1 in |
|---|---|
| Diameter | 18.1 in |
| Width | 18.1 in |
| Depth | 11.8 in |
| ENERGY STAR certified | Yes |
|---|
Real flow rate by climate
A tankless heater's usable flow depends on how far it must raise incoming water temperature. Sustained hot-water flow of the Noritz EZ71DV (GQ-C2661WX-FF US) at common temperature rises (a typical shower uses about 2 GPM of mixed water):
| Temperature rise | Climate | Sustained flow | Simultaneous showers |
|---|---|---|---|
| 45 °F | Warm climate (~75 °F groundwater) | 4.7 GPM | 2 |
| 55 °F | Mild climate (~65 °F groundwater) | 4.7 GPM | 2 |
| 70 °F | Cold climate (~50 °F groundwater) | 4.5 GPM | 2 |
| 77 °F | DOE test condition | 4.1 GPM | 2 |
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Frequently asked questions
Is the Noritz EZ71DV (GQ-C2661WX-FF US) ENERGY STAR certified?
Yes, the Noritz EZ71DV (GQ-C2661WX-FF US) holds a current ENERGY STAR certification for water heating efficiency (UEF 0.98).
How much does the Noritz EZ71DV (GQ-C2661WX-FF US) cost to run per year?
About $251 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What venting does the Noritz EZ71DV (GQ-C2661WX-FF US) use?
The Noritz EZ71DV (GQ-C2661WX-FF US) uses Power Direct Vent venting with 2 / 3 in vent connections. Matching the existing vent type is usually the cheapest replacement path.
Is the Noritz EZ71DV (GQ-C2661WX-FF US) a smart water heater?
No, the Noritz EZ71DV (GQ-C2661WX-FF US) is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)