GE GP40S**AYV01

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.63 for the GE GP40S**AYV01, a gas tank model. This site, not the registry, computed 176 therms per year from that UEF and the DOE test's daily hot-water draw for the medium draw pattern. The figure applies to natural gas at that draw only. Its energy use is 9 therms below the class median of 185 therms. That is the 62nd lowest energy use of 288 models, in the lowest quarter of its class. The source is DOE CCD, retrieved 2026-09-19.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 60 gallons, and the rated volume is 40 gallons. The annual figure does not use either value, since it comes only from the UEF and the test draw. The 176 therms figure suits a household whose daily use matches the medium draw pattern, because that is the draw it was computed for. It does not describe a household with much heavier or lighter use, since no annual figure for other draw patterns is available here. To compare by size and space, use the selector by fuel, space and size. To check a same-class alternative, find a same-class replacement by model number.

Running cost is not written in this text because it depends on the state average residential gas price, which differs by reader. Applying that price to 176 therms gives the yearly cost at the medium draw pattern. The cost calculator on your own ZIP does this, and the page on how the annual cost is calculated sets out the method. The gap of 9 therms to the class median of 185 therms is a difference in energy, not in cost, until a price is applied. Actual use in a home is not available here, because the figure is a computed test value and not a measurement of any household. The installed price range appears in its own block on this page as a modeled range, not a quote.