AMERICAN G6-US4040NV 5**

The 264 therms figure is calculated 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 0.64 with the DOE test's daily hot-water draw for the high draw pattern. The UEF comes from the DOE CCD, retrieved 2026-09-19. The page on how the annual figure is calculated sets out each step. Among the 414 gas tank models at this draw pattern, this unit ranks 236th lowest energy use of 414. That places it in the second-highest quarter of its class for energy use. The 4 therms gap to the class median applies only at the test's daily draw. This data does not show how the gap changes at other levels of household use.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. For that kind of use, the registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 83 gallons. The rated volume is 38 gallons. The 264 therms figure applies at the test's draw only. Energy use for a household that draws more or less hot water than the test assumes is not available here. This comparison covers only gas tank models at the high draw pattern, so it does not apply to other fuels or sizes. The water heater selector by fuel, space and size filters on those terms. A same-class replacement search by model number starts from G6-US4040NV 5**.

The running cost is not written in this text. It depends on your state's average residential gas price, so the page uses your ZIP to calculate it from the 264 therms test-draw figure. The cost calculator for your own ZIP shows that result. The same rate also applies to the 4 therms difference from the 260 therms class median. The cost of that gap therefore depends on your rate and is not a fixed amount. The installed price range appears in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote, and its figures are not repeated here.