LOCHINVAR GUR-50 4**

The registry does not print the 264 therms figure. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used. For this model, the UEF is 0.64. That ratio was combined with the DOE test's daily hot-water draw for the high draw pattern. The source is DOE CCD, retrieved 2026-09-19. The class is the 414 models registered as a gas tank at the high draw pattern. Within it, this unit ranks 236th lowest for energy use, in the second-highest quarter of its class. The figure holds only at the test's daily draw. Energy use at any other daily draw is not available here.

The high draw pattern describes a larger household, or one where showers and laundry overlap. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 84 gallons. The rated volume is 48 gallons. A household that draws less hot water than the test assumes would not use 264 therms a year. The registry does not give its actual figure, so that figure is unknown. A plumber or seller checking a swap can find a same-class replacement by model number. The other unit's rank can then be compared with 236th of 414 in the same class.

This text does not state the running cost of 264 therms of natural gas a year. It depends on the average residential gas price in your state. The page computes it from your ZIP in the cost calculator on your own ZIP. The method behind that figure is set out in how the annual cost is calculated. At any single gas rate, this unit uses 4 therms a year more than the class median, at the test's draw. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote.