A. O. SMITH GDVNT-50L 1**

The annual figure of 260 therms is not read directly from the registry. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.65 for this model, and from the DOE test's daily hot-water draw for the high draw pattern. The source is DOE CCD, retrieved 2026-09-19. The class median for the 414 gas tank models at this draw pattern is 260 therms, so this model sits 0 therms from the median. Its rank is 204th lowest energy use of 414, in the second-lowest quarter of its class. The figure describes the federal test's daily draw only. It does not describe how much hot water any particular home uses.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. For that use, the first hour rating, the gallons of hot water available in the first hour from a full tank, is 84 gallons for this model. Its rated volume is 48 gallons. Both come from the registry entry and are not adjusted for any home. The listing fits a reader whose usage is close to the high draw pattern. It says little for a household that uses much less or much more hot water than the federal test's daily draw. Actual household usage is not available in this data. 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 260 therms of natural gas is the quantity to combine with your own rate. The cost calculator does this from your ZIP, and the methodology page explains how the annual cost is calculated. Because this model's energy use is 0 therms from the class median of 260 therms, its gas cost at the federal test's draw would match a median model of the class at the same rate. The modeled installed-cost range is shown in its own block with its source and date. To compare units of the same class, you can find a same-class replacement by model number.