AMERICAN GPDX-50L 3**

The figure of 232 therms is computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, which is 0.73 for this model, with the daily hot-water draw the DOE test assigns to the high draw pattern. The source is DOE CCD, retrieved 2026-09-19. Against the class median of 260 therms, the unit sits 28 therms lower. Its rank of 33rd lowest of 414 places it in the lowest quarter of its class for energy use. The figure describes the test's draw only, and this page has no measured value for any specific household. The calculation is explained in how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 118 gallons on a rated volume of 48 gallons. The energy figure of 232 therms applies only to that draw pattern. A household with a different daily use is not described by it, and this page has no energy value for other draw patterns. A low energy figure also does not show whether the first hour rating covers a particular home's peak demand. For a comparison by fuel, space and size, use the water heater selector by fuel, space and size.

The running cost is not written here because it depends on your state's average residential gas price, and this page does not know your location. The 232 therms of natural gas is the fixed part of the calculation; the price per therm is yours. The same price applies to the 28 therms gap from the class median of 260 therms, so the cost difference from a median unit scales with your rate. To see the cost, enter your ZIP in the cost calculator on your own ZIP. The modeled installed-cost range appears in its own block, with its source and date, and is not a quote. To look at another model in the same class, find a same-class replacement by model number.