GE GP40T**AYV01

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.62 for this model. The registry does not list annual energy. This site computed 179 therms from that UEF and the daily hot-water draw of the DOE test. It applies to the medium draw pattern only. The source is DOE CCD, retrieved 2026-09-19. A home that uses more or less hot water than the test draw will use a different amount of gas. The method behind the annual figure is documented on its own page. The registry gives no measured consumption for any single home.

Among the 288 models registered as a gas tank at the medium draw pattern, this one has the 72nd lowest energy use. That puts it in the lowest quarter of its class. Its 179 therms compares with a class median of 185 therms, a difference of 6 therms below. That difference holds only at the medium draw pattern. The registry data used here gives rank and median, but not the full spread of the class. A reader comparing two units should check that both use the same fuel, tank type and draw pattern. A comparison across different classes would not match this ranking.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 68 gallons for this model. The tank holds 40 gallons. A household whose busiest hour draws more than 68 gallons falls outside what this rating covers. A household with a much higher daily draw than the medium draw pattern would also use more gas than 179 therms. Running cost depends on your state average residential gas price, so this text states none. Enter your ZIP in the cost calculator to see it. To look for a same-class unit, use the replacement search by model number. A modeled installed-cost range appears in its own block, with its source and date.