A. O. SMITH GDVT-50 3**

The 260 therms figure is not a registry entry. This site computed it from the UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw. The registry lists 0.65 as the UEF of the GDVT-50 3**. The source is DOE CCD, retrieved 2026-09-19. The figure holds only for natural gas at the high draw pattern. A household that draws more or less hot water than the test day will use a different amount. The method behind the annual figure is documented on its own page. Measured use in a real home is not available from this data.

Among the 414 models registered as a gas tank at the high draw pattern, this one ranks 204th lowest for energy use. Its use equals the class median of 260 therms, so the difference is 0 therms. That places it in the second-lowest quarter of its class for energy use. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 82 gallons. The rated volume is 48 gallons. Both values are the registry's own entries for this model. The data here does not show how these two values compare with other models in the class.

The running cost is not in this text, because it depends on your state's average residential gas price. Multiply 260 therms by your own rate, or enter your ZIP in the cost calculator. The 260 therms applies only at the high draw pattern. A household with a smaller daily draw should not read it as its own use. Other units can be compared with the selector by fuel, space and size. For a same-class replacement, search the replacement finder by model number. The installed price range appears in its own block with its source and date. It is a modeled range, not a quote.