LOCHINVAR GCRL-40 4**

This site calculated the 191 therms figure. The registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw that the DOE test sets for the medium draw pattern. For this model, the UEF is 0.58 in DOE CCD data retrieved 2026-09-19. Under the same test condition, the model ranks 231st lowest energy use of 288 gas tank models. A household that uses more or less hot water than the test assumes will use a different amount of gas. That amount is not available here. The page does not measure real use in any home. The steps behind the figure are set out in how the annual cost is calculated.

DOE's medium draw pattern represents a typical household's daily hot-water use. The 191 therms figure applies to that pattern only. The model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 67 gallons. Its rated volume is 38 gallons. If your household matches the medium pattern, you can compare this model directly with the rest of its class. If yearly gas use matters most to you, its rank of 231st shows that most models in the class use less at the same draw. The registry data does not show how the model performs outside the test. To look at other models in the same class, use the same-class replacement search by model number or the water heater selector by fuel, space and size.

This text does not state a running cost. The cost depends on your state's average residential gas price. That price is not in the registry data. Once you enter your ZIP, the page applies that price to 191 therms of natural gas a year at the medium draw pattern. The 6 therms gap to the class median of 185 therms works the same way. How much that gap costs depends on your rate. The installed price range appears in its own block on this page, with its source and date. It is a modeled range, not a quote. To see the running cost at your own rate, use the water heater cost calculator for your ZIP.