GE GG40T**AYV01

This site calculates the 249 therms figure; the registry does not list it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the high draw pattern. For this model, the UEF is 0.68. The inputs come from the DOE CCD, retrieved 2026-09-19. The class holds 414 gas tank models registered at the high draw pattern. Among them, this unit ranks 164th lowest in energy use. That puts it in the second-lowest quarter of its class, 11 therms below the 260 therms median. The rank compares figures at test conditions only. The registry does not record how the unit performs in a specific home, so that is unknown here.

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 82 gallons. Its rated volume is 40 gallons. The 249 therms figure fits a household whose daily use is close to the test draw. A lighter or heavier household would use a different amount of gas. The registry data does not give that amount. To compare other units, the water heater selector by fuel, space and size lists them by those filters. To find units in this same class, use the replacement search by model number and start from GG40T**AYV01.

This text does not state the running cost. The cost depends on the 249 therms of natural gas at the test draw and on your state's average residential gas price. The page works it out from your ZIP, so the result follows your own rate. You can see that figure in the cost calculator for your own ZIP. The steps are explained on the page about how the annual cost is calculated. The 11 therms gap to the class median applies only at the test draw. What that gap is worth in running cost also depends on your rate. The installed-cost range on this page has its own block, with its source and date. It is a modeled range, not a quote.