LOCHINVAR G9-UT4040NVR 5**

The 264 therms figure is not printed in the registry. This site computed it from 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 0.64, taken from DOE CCD data retrieved 2026-09-19. The high draw pattern describes a larger household, or one where showers and laundry overlap. If your household uses a different amount of hot water than the test assumes, your gas use may differ from 264 therms. The data here does not say by how much. The steps behind the figure are set out in how the annual cost is calculated.

Within its class, the model ranks 236th for lowest energy use of the 414 models. That places it in the second-highest quarter of its class for energy use. On capacity, its rated volume is 38 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 83 gallons. That rating is the capacity figure to compare with other gas tank models at the high draw pattern. Readers checking for lower gas use should note that the models ranked ahead of it use less than 264 therms a year at the test's draw. The selector by fuel, space and size filters this class, and you can find a same-class replacement by model number.

The running cost is not written in this text. It depends on your state's average residential gas price, so the page computes it from your ZIP. That calculation starts from 264 therms of natural gas a year, at the high draw pattern and the test's daily draw. To see the result for your own rate, use the cost calculator on your own ZIP. The installed price range appears in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote. This page does not have the model's energy use at other draw patterns.