A. O. SMITH GPVT-40 2**

The 242 therms figure is computed by this site, not by the registry. It starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.7 for this model. It combines that value with the DOE test's daily hot-water draw for the high draw pattern. The source is DOE CCD, retrieved 2026-09-19, and the figure applies to natural gas and to that test draw only. Actual use in a home depends on how much hot water is drawn, so the figure works as a comparison value. The calculation is explained under how the annual cost is calculated.

Against the 414 models registered as a gas tank at the high draw pattern, this model ranks 90th lowest for energy use. That places it in the lowest quarter of its class, with use 18 therms below the class median of 260 therms. It has a first hour rating, the gallons of hot water available in the first hour from a full tank. The registered value is 87 gallons, and the rated volume is 38 gallons. The high draw pattern describes a larger household, or one where showers and laundry overlap. The registry data does not show whether 87 gallons covers your own busiest hour. A household whose hot-water use differs from the test draw will see a different annual figure.

The running cost is not stated in the text, because it depends on the state average residential gas price, which differs by location. That price is applied to the 242 therms figure, which holds for the high draw pattern only. The cost calculator for your own ZIP does that calculation. Apply the same rate to the 18 therms gap below the class median of 260 therms. The result is the yearly difference in gas cost from the class median. The modeled installed-cost range appears in its own block with its source and date, as a range, not a quote. To look for a unit in the same class, find a same-class replacement by model number using GPVT-40 2**.