AMERICAN GUR-50 4**

The figure of 264 therms is not taken directly from the registry. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.64 for this model. The calculation applies the daily hot-water draw that the DOE test uses for the high draw pattern. The source is the DOE CCD, retrieved 2026-09-19. Among 414 gas tank models registered at the same draw pattern, this unit ranks 236th lowest in energy use. That places it in the second-highest quarter of its class. The method is set out on the methodology page.

The high draw pattern describes a larger household, or one where showers and laundry overlap. For that use, this unit has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 84 gallons. Its rated volume is 48 gallons. The registry lists both values, but the energy figure above rests on the UEF and the test draw, not on them. The unit uses 4 therms more than the class median of 260 therms, so it sits above the median model. A reader whose priority is the lowest gas use may want to compare other models with the water heater selector, which filters by fuel, space and size.

The running cost is not written here because it depends on your state's average residential gas price. Enter your ZIP in the cost calculator and it applies that price to the 264 therms figure. That value holds only for the high draw pattern and the federal test's daily draw. Actual hot-water use in a particular home is not part of this data. The installed price range appears in its own block as a modeled range, not a quote. To compare against another unit of the same class, look up its model number with the replacement finder.