Noritz EZ111DV (GQ-C3259WX-FF US)

The 176 therms figure was computed by this site. It does not come from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.96 with the DOE test's daily hot-water draw for the high pattern. The figure holds only at that test draw. It does not describe a household whose daily hot-water use differs from the draw. The source is DOE CCD, retrieved 2026-09-19. Among the 397 models in its class, this unit ranks 12th lowest for energy use, which puts it in the lowest quarter of the class. The gap to the class median is 6 therms a year at the same test draw. The page on how the annual energy and cost figures are calculated sets out each step.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. The 12th ranking and the 6 therms gap apply only to homes of that kind, measured at the test draw. The registry also lists a maximum flow rate in gallons per minute of 5.8 for this unit. That is the most hot water it is rated to deliver at one time. The data does not say whether that rate covers the fixtures a particular home runs together. For a smaller household, the class comparison on this page does not apply, because it covers only the high draw pattern. A plumber or seller checking other units can find a same-class replacement by model number.

This text does not give a running cost. It depends on the average residential natural gas price in the reader's state, so the page computes it from the reader's ZIP. At 176 therms a year, the cost moves in step with that local rate. The 6 therms gap to the class median is converted at the same rate. For the same therms, a state with a higher gas price gives a higher yearly cost. The running-cost calculator for your own ZIP applies your state's rate to this model. This page shows the installed-cost range in a separate block, with its source and date. It is a modeled range, not a quote.