A. O. SMITH GPVL-40 2**

The figure of 165 therms is computed by this site, not published by the registry. It combines the DOE test's daily hot-water draw for the medium draw pattern with the registry's UEF, the ratio of hot water delivered to energy used, which is 0.67 for this model. The source is the DOE CCD, retrieved 2026-09-19. The result applies only to that test draw. A household that uses more or less hot water than the test assumes will burn a different amount of gas. How the annual cost is calculated sets out the steps.

Against its class, the model sits 20 therms below the median of 185 therms, at 20th lowest energy use of 288 models registered as a gas tank at the medium draw pattern. That places it in the lowest quarter of its class. The comparison covers energy use only and says nothing about capacity. Capacity is described by the first hour rating, the gallons of hot water available in the first hour from a full tank, which is 73 gallons here, with a rated volume of 38 gallons. A household whose busiest hour draws more than 73 gallons is outside what this figure describes. The registry does not show demand in any particular home. The water heater selector filters by fuel, space and size.

Running cost is not written here because it depends on the state average residential gas price, which differs by location. Multiply 165 therms by the gas price that applies to you, or use the cost calculator, which takes your ZIP. The modeled installed-cost range is shown in its own block on this page with its source and date; it is a modeled range, not a quote. Metered use in a specific home is not available in the registry data, so read 165 therms as a test-condition figure for the medium draw pattern, not a forecast. To compare with units of the same class, find a same-class replacement by model number.