AMERICAN GCFL-50 1**

The registry lists AMERICAN GCFL-50 1** with a UEF, the ratio of hot water delivered to energy used, of 0.69. This site combined that value with the DOE test's daily hot-water draw for the high draw pattern to get 245 therms of natural gas a year. The registry does not publish that annual figure itself. The class median is 260 therms, so this model sits 15 therms below it. Its rank is 130th lowest energy use of 414, which places it in the second-lowest quarter of its class. The source is DOE CCD, retrieved 2026-09-19. The method behind the annual figure is described on the methodology page.

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 78 gallons, and a rated volume of 49 gallons. It fits a household whose busiest hour of hot-water use stays within 78 gallons. It does not fit a household whose busiest hour draws more than that, and this page cannot say whether yours does. The 245 therms figure also assumes the test's daily draw, so a home that uses more or less hot water than the test will use different energy. To compare units by fuel, space and size, use the water heater selector.

The running cost is not written here because it depends on your state's average residential gas price, and that price is not part of this model's data. Applying your rate to 245 therms gives the yearly cost at the test's draw. The cost calculator on your own ZIP does this for you. The result is a test-condition figure, not a forecast of your bill. The gap of 15 therms from the 260 therms median is measured in energy, so its effect on cost depends on the same rate. The installed price appears in its own block as a modeled range, not a quote. To find a unit in the same class by model number, use the same-class replacement search.