A. O. SMITH GCGH-50 2**

The 269 therms figure is computed by this site, not the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.63 for this model. It also uses the DOE test's daily hot-water draw for the high draw pattern. The source is DOE CCD, retrieved 2026-09-19. Against 414 gas tank models at the same draw pattern, this unit ranks 320th lowest for energy use. That places it in the highest quarter of its class. Its use sits 9 therms above the class median of 260 therms. The method is set out in the methodology for the annual cost calculation.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 76 gallons. The rated volume is 48 gallons. The high draw pattern applies to a larger household, or one where showers and laundry overlap. This unit's energy figure describes that use. A household with lighter hot-water use is outside that condition, and its annual energy is not available on this page. Someone who puts low energy use first should note the 320th lowest position among 414 models. The selector by fuel, space and size can narrow the comparison.

The running cost is not stated in the text. It depends on your state's average residential gas price applied to 269 therms of natural gas. Enter your ZIP in the cost calculator for your own ZIP to get the result at your rate. That result holds only for the high draw pattern, so a household with different hot-water use will see a different figure. The modeled installed-cost range is in its own block with its source and date. It is a range, not a quote. To find a same-class replacement for GCGH-50 2**, use the replacement finder by model number. Compare its energy use with the class median of 260 therms and this unit's 269 therms.