LOCHINVAR GCRX-55 2**

The 273 therms figure is computed by this site, not taken from the registry. It combines the model's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. For this model the UEF is 0.62, from the DOE CCD retrieved 2026-09-19. Among the 414 models registered as a gas tank at the high draw pattern, it ranks 367th lowest in energy use. That rank places it with the higher energy users in its class. The figure holds only at the test's daily draw. A home that uses more or less hot water than the test assumes will burn a different amount of gas. The methodology behind this site's energy and cost figures sets out each step.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. For that kind of demand, the registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 83 gallons. The rated volume is 55 gallons. A home whose use matches that pattern can read the 273 therms figure as a direct reference. A smaller household drawing less hot water is outside the condition the figure was computed for. Its own gas use is not available from this data. A reader who wants lower gas use at the same pattern can look at models ranked ahead of this one's 367th place. Use the same-class replacement search by model number, or narrow the field with the selector by fuel, space and size.

This page does not state a running cost in the text. The cost of 273 therms of natural gas a year depends on the reader's state average residential gas price. The page computes it from the reader's ZIP, and the cost calculator on your own ZIP shows the same calculation in full. Applying that rate to the 260 therms class median shows what the 13 therms gap costs in the reader's own state. The installed price range appears in its own block with its source and date. It is a modeled range, not a quote. Two things remain unknown here: the actual gas use in a specific home, and how the unit performs outside the DOE test conditions.