A. O. SMITH GUR-50 4**

The 264 therms figure in the answer above 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, with the DOE test's daily hot-water draw for the high pattern. For this model the UEF is 0.64, as listed in the DOE CCD retrieved 2026-09-19. Ranked by annual energy use at the high draw pattern, it is 236th lowest of 414 gas tank models. That puts it in the second-highest quarter of its class for energy use. The figure applies only at the test's daily draw. Gas use at any other daily draw is not available from the registry, and this page does not estimate it.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 84 gallons. Its rated volume is 48 gallons. The 264 therms figure describes a household whose daily use matches the high pattern. For a smaller household with lighter use, this figure does not apply. The model's gas use at lower daily draws is not available here. If you need a different fuel, space or size, the selector by fuel, space and size filters registered models. To check other gas tank models at the high pattern, find a same-class replacement by model number.

No running cost appears in this text, because it depends on your state's average residential gas price. The page computes it from your ZIP, using the 264 therms of natural gas at the high draw pattern as the input. The cost calculator on your own ZIP runs the same step for your rate. The 4 therms gap to the class median, stated above, is priced at the same rate as the unit's own use. How the annual cost is calculated sets out each step and its sources. The installed price range is shown in its own block, with its source and date. It is a modeled installed-cost range, not a quote, and this text does not restate its figures.