AMERICAN GCF-50 1**

This site computed the 245 therms figure. The registry does not publish it. The figure combines the model's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. The registry lists this model's UEF as 0.69, from DOE's Compliance Certification Database (CCD), retrieved 2026-09-19. The figure rests on the test's fixed daily draw, so it describes standard use rather than a specific home. A home whose daily draw differs from the test's would see a different annual figure. This page has no data on any individual home's draw, so that difference is unknown. The calculation steps are set out in how the annual energy and cost figures are 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 84 gallons. That comes from a rated volume of 48 gallons. In its class of gas tank models at the high draw pattern, it ranks 130th lowest for energy use of 414. The models ranked ahead of it use less energy at the same test draw. The figure does not describe a smaller household's use. This data has no energy figure for this model at any other draw pattern.

Running cost is not given here because it depends on your state's average residential natural gas price. The page computes it from your ZIP code. You can also run it in the cost calculator for your own ZIP code. The same rate sets the cost of the 15 therms a year between this model and its class median at the test draw. That means the value of the gap also varies by state. The page shows the installed cost separately, with its own source and date. That figure is a modeled range, not a quote. To check another gas tank model at the high draw pattern against the same figures, use the same-class replacement search by model number.