LOCHINVAR GCRX-50 2**

The 277 therms figure does not appear in the registry itself. This site calculated it from the model's UEF, the ratio of hot water delivered to energy used. For this unit, the UEF is 0.61. The second input is the DOE test's daily hot-water draw for the high pattern. The UEF comes from the DOE Compliance Certification Database (CCD), retrieved 2026-09-19. The result only holds at that test draw. A home that draws less hot water each day will burn less gas than 277 therms, and a home that draws more will burn more. The size of that difference is not available in this data. The steps behind the figure are set out on the page explaining how the annual cost is calculated.

Among the 414 gas tank models at the high draw pattern, the LOCHINVAR GCRX-50 2** ranks 400th lowest in energy use. That places it in the highest quarter of its class for energy use. The high pattern describes a larger household, or one where showers and laundry overlap. The unit's rated volume is 49 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 99 gallons. These two figures describe capacity, not efficiency, so they do not change its rank. If you are verifying a same-class alternative with lower energy use, you can find a same-class replacement by model number.

The yearly running cost is not given in this text because it depends on your state's average residential gas price. The page works it out from your ZIP by applying that price to 277 therms of natural gas at the high draw pattern. The 17 therms gap to the class median is priced at the same local rate, so how much it costs also depends on your ZIP. A smaller household may fit a lower draw pattern. For that household, the 277 therms figure does not apply, and this data has no annual value for the model at another pattern. To run the figures on a different rate, use the cost calculator on your own ZIP. The modeled installed-cost range appears in its own block, with its source and date.