Noritz NR98SV (GQ-2857WX-F US)

This site calculated the 206 therms figure. The registry does not list it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.82 for this unit. It combines that with the DOE test's daily hot-water draw for the high draw pattern. The result describes gas use under the federal test's daily draw, not in any particular home. A household that draws more hot water each day than the test assumes will use more than 206 therms. One that draws less will use less. The underlying registry data comes from DOE CCD, retrieved 2026-09-19. You can see each step on the page explaining how the annual cost is calculated.

The high draw pattern represents a larger household, or one where showers and laundry overlap. This unit's maximum flow rate in gallons per minute is 5.1, according to the registry. Among the 397 gas tankless models registered at the high draw pattern, it ranks 229th for lowest energy use. At 24 therms above the class median of 182 therms, it uses more gas under the same test than the median model in its class. Some readers need a unit whose annual gas use at this draw pattern is at or below the median. For them, this model does not meet that mark. You can list lower-use models of the same class with a same-class replacement search by model number.

The text on this page gives no running cost. The yearly cost of 206 therms depends on your state's average residential gas price, so the page calculates it from your ZIP. The same applies to the 24 therms gap between this unit and its class median, because what that gap costs a year depends on your gas rate. This site does not know your rate until you enter a ZIP, so no cost figure is stated here. The installed-price range on this page appears in its own block with its source and date. It is a modeled range, not a quote. You can work out the running cost with the cost calculator for your own ZIP.