AMERICAN GUC 40 4**

The figure of 264 therms is computed by this site, not published by 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 registry data comes from the DOE CCD, retrieved 2026-09-19. The number applies only to natural gas and only to that test draw. A household that draws more or less hot water than the test assumes will use a different amount, and measured use in a home is not available in this data. The calculation is described in how the annual cost is calculated.

Among the 414 models registered as a gas tank at the high draw pattern, this unit ranks 236th lowest energy use. That places it in the second-highest quarter of its class for energy use, 4 therms above the class median of 260 therms. The high draw pattern describes a larger household, or one where showers and laundry overlap. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 83 gallons, and the rated volume is 38 gallons. This entry fits a reader confirming a listing for that draw pattern. It fits less well a reader who wants the lowest energy use in the class, because the class median is lower. Whether the first hour rating covers a given household's busiest hour is not available from this data. The selector by fuel, space and size compares other options.

The running cost is not stated here because it depends on your own gas rate. The page computes it from the state average residential gas price for your ZIP, applied to 264 therms. The same rate applied to the class median of 260 therms would give a lower cost, and the gap corresponds to the 4 therms difference shown above. The cost calculator on your own ZIP gives the result. The modeled installed-cost range appears in its own block with its source and date, and it is not a quote. If you need a unit in the same class with a different energy figure, find a same-class replacement by model number.