AMERICAN GCGH-50 2**

The registry lists this model with a UEF, the ratio of hot water delivered to energy used, of 0.63. This site multiplies that value by the daily hot-water draw the DOE test assigns to the high draw pattern, which gives 269 therms per year of natural gas. The registry does not publish that annual figure itself. It is computed here from DOE CCD data retrieved 2026-09-19. The result applies only at the federal test's daily draw. A household that uses more or less hot water than the test assumes will use a different amount of gas, and this page has no value for that case.

The 414 models registered as a gas tank at the high draw pattern have a median of 260 therms. This unit sits 9 therms above that median, at 320th lowest energy use of 414, in the highest quarter of its class for energy use. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 76 gallons, and its rated volume is 48 gallons. Those two values are the ones to compare with a household's peak-hour demand. A reader whose main concern is gas use will find that models ranked below this one use less at the same draw pattern. The methodology page describes the calculation, and the water heater selector filters by fuel, space and size.

The running cost is not stated here because it depends on the state average residential gas price, which differs by reader. The cost calculator applies your own ZIP to the 269 therms figure. That result holds only at the high draw pattern. The installed price range on this page is a modeled range, not a quote. It is shown in its own block with its source and date. To compare GCGH-50 2** with another unit in the same class, the replacement finder searches by model number.