A. O. SMITH GCR-40 410

The figure of 264 therms was computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.64 with the DOE test's daily hot-water draw. The source is the DOE CCD, retrieved 2026-09-19. Its rank is 236th lowest in energy use among 414 gas tank models registered at the high draw pattern. It is 4 therms above the class median of 260 therms. That places it in the second-highest quarter of its class for energy use. All of these comparisons hold only at the high draw pattern.

The registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 80 gallons. The rated volume is 38 gallons. The energy figure applies to a larger household, or one where showers and laundry overlap. A household with a different draw pattern would use a different amount, and that amount is not available on this page. Whether 80 gallons covers a given household's peak demand is not shown by the registry data. For a comparison by fuel, space and size, use the water heater selector. To look up a unit of the same class, use a same-class replacement search by model number.

The running cost is not written here because it depends on the state average residential gas price. The cost calculator on your own ZIP applies that price to the 264 therms shown above. It uses the same high draw pattern, so a result for another pattern would differ. The steps are described in how the annual cost is calculated. The installed price range sits in its own block with its source and date. It is a modeled installed-cost range, not a quote. This page makes no estimate for a household whose hot-water use differs from the federal test's daily draw.