LOCHINVAR GCG-50 4**

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. The registry lists a UEF of 0.62 for this model. The source is the DOE Compliance Certification Database (CCD), retrieved 2026-09-19. The figure holds only at that test draw. A household using more or less hot water than the test assumes will use a different amount of gas. How much different is not available from the registry. The steps behind the figure are set out in how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. For that use, the registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 81 gallons. The rated volume is 48 gallons. A household that fits this pattern can set those two values against its own peak demand. A smaller household with lower daily demand falls outside the test condition, so the 273 therms figure would not describe its use. Its own figure is not available from this page. Other fuels and tank sizes are listed in the selector by fuel, space and size.

The class here is the 414 models registered as a gas tank at the high draw pattern. The 13 therms gap to the class median, noted above, places this model at rank 367th for lowest use. That means most models in its class use less gas at the same test draw. A same-class model with lower use can be found through a same-class replacement by model number. The running cost is not stated in this text. It depends on the reader's state average residential gas price, and the page computes it from the reader's ZIP. The cost calculator on your own ZIP applies that same rate to the 273 therms figure. The installed price block on this page shows a modeled range, not a quote.