STATE GCB-40 4**

The 264 therms figure is calculated by this site. The registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high pattern. For this model the UEF is 0.64, taken from the DOE CCD on 2026-09-19. The figure applies only at that test draw. If a household uses more or less hot water, its gas use will differ, and this page does not have that amount. Among the 414 gas tank models at the high pattern, this model ranks 236th for lowest energy use. That puts it in the second-highest quarter of its class for energy use. The steps are explained in how the annual cost is 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 78 gallons. Its rated volume is 38 gallons. The 264 therms figure describes a household of that pattern using the test's daily draw. A household whose busiest hour needs more than 78 gallons of hot water needs more than this rating covers. A smaller household with lighter use does not match the high-pattern test. This page does not have an energy figure for that household. If you want a unit in the same class, you can find a same-class replacement by model number.

This text does not give a running cost because the cost depends on your state's average residential gas price. The page works it out from your ZIP. It applies that price to the 264 therms of natural gas at the high draw pattern. The same 264 therms leads to a different yearly cost in each state, so no single cost figure is written here. The cost of the 4 therms gap above the 260 therms class median also depends on your local gas price. To see the result for your own rate, use the cost calculator on your own ZIP. The installed-cost range on this page is in its own block with its source and date. It is a modeled range, not a quote.