AMERICAN GCFL-40 1**

The figure of 168 therms is computed by this site, not published by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.66 with the DOE test's daily hot-water draw for the medium draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The class is the 288 models registered as a gas tank at this draw pattern. Its median is 185 therms, and this model sits 17 therms below it. A rank of 27th lowest puts it in the lowest quarter of its class for energy use. The steps behind the calculation are set out in how the annual cost is calculated.

The figure of 168 therms applies only to the medium draw pattern. A household whose use is close to that test draw can compare its own consumption with it directly. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 65 gallons for this model, and the rated volume is 38 gallons. Whether that rating covers a particular household's busiest hour is for the reader to check against their own use. A household that draws more than the medium pattern is not covered by this figure, and energy use at other draw patterns is not available for this model on this page. To compare by fuel, space and size, use the water heater selector.

The running cost is not stated in the text because it depends on the state average residential gas price, which differs by reader. Multiplying 168 therms by the price per therm at your location gives the yearly cost at the medium draw pattern. The cost calculator does this from your ZIP. The gap of 17 therms to the class median of 185 therms scales with the same price, so the cost difference from a median model also depends on your rate. The installed price range appears in its own block as a modeled installed-cost range, not a quote. To look for a same-class unit, you can find a replacement by model number.