A. O. SMITH GCRX-55 2**

This site computed the 273 therms figure; the registry does not list it. The figure combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw that the DOE test sets for the high draw pattern. This model's UEF is 0.62, from the DOE CCD, retrieved 2026-09-19. The figure holds only at that test draw. A household that draws more or less hot water each day will use more or less gas than 273 therms. Among the 414 models in its class, it ranks 367th lowest in energy use. That puts it in the highest quarter of the class for energy use. The steps behind the figure are set out in how the annual cost is calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. This unit's first hour rating, the gallons of hot water available in the first hour from a full tank, is 83 gallons. Its rated volume is 55 gallons. For a home that matches the high draw pattern, 273 therms is the figure to compare. For a smaller household with lower daily use, the figure does not apply directly, because it is tied to the high test draw. This model's energy use at a lower draw is not available on this page. To compare other gas tank models of a similar size, use the selector by fuel, space and size.

The text does not state a running cost. That cost depends on the average residential gas price in the reader's state, so the page works it out from the reader's ZIP. The gap to the class median does not change with the rate. At the high test draw, this model uses 13 therms more gas a year than the 260 therms median. That extra gas is billed at the same local rate as the rest. To see the yearly cost at your own rate, use the cost calculator for your own ZIP. To check a same-class model with lower energy use, find a same-class replacement by model number. The installed-cost range in its own block is a modeled range, not a quote.