LOCHINVAR GCR-50 2**

This site computed the 264 therms figure. The registry does not publish it. The calculation uses 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. It comes from the DOE Compliance Certification Database, retrieved 2026-09-19. The yearly figure is valid only at the test's daily draw, not at a particular home's usage. Actual gas use in a given home is not available here, because it depends on how much hot water that home draws. The steps behind the energy figure are set out in how the annual energy and cost are calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. Among the 414 gas tank models at that draw pattern, this model ranks 236th for lowest energy use. That puts it in the second-highest quarter of its class for energy use. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 81 gallons. Its rated volume is 48 gallons. A plumber or seller checking a quoted unit can match these rated figures against the unit's label. To compare it with other registered models at the same draw pattern, use the same-class replacement search by model number.

The running cost does not appear in this text. It depends on the average residential natural gas price in your state. The page therefore calculates it from your ZIP, using 264 therms a year at the high draw pattern. The water heater cost calculator for your own ZIP shows that result. The 4 therms gap from the class median is also priced at your state's gas rate, so no single cost gap applies in every state. Your home may draw less hot water than a larger household, or your showers and laundry may rarely overlap. In that case, the 264 therms figure does not describe your use, and this class comparison may not fit. The installed-cost range appears in a separate block as a modeled estimate, not a quote.