AMERICAN STANDARD WATER HEATERS GN50T1-3-*

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.63 for this model. This site combined that UEF with the DOE test's daily hot-water draw for the high draw pattern to get 269 therms of natural gas a year. The registry does not publish this figure; the site computes it, and the DOE CCD data was retrieved on 2026-09-19. The class median is 260 therms, so this model sits 9 therms above it. Its rank of 320th lowest of 414 puts it in the highest quarter of its class for energy use. The figure applies only to the test draw, and use in a home will differ with how much hot water is drawn.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 85 gallons, and a rated volume of 47 gallons. Those are the two figures to compare against a household's busiest hour. The data on this page does not say whether they meet any particular household's peak demand. A household with lower demand would fall under a different draw pattern, and the 269 therms figure would not apply to it. To filter by fuel, space and size, use the water heater selector.

Running cost is not stated here because it depends on the state average residential gas price, which differs by reader. Multiplying the 269 therms figure by your own price per therm gives the annual fuel cost at the test draw. The cost calculator does this from your ZIP, and the page on how the annual cost is calculated explains the method. Because this model uses 9 therms more than the class median of 260 therms, its annual fuel cost at any given rate is higher than a median model's by 9 therms multiplied by that rate. The installed price range appears in its own block, with its source and date, as a modeled range and not a quote.