RELIANCE WATER HEATERS GCR-40 410

The 264 therms figure is computed by this site. The registry does not publish it. It combines the registry'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 0.64, and the source data is DOE CCD, retrieved 2026-09-19. The page on how the annual cost is calculated sets out the method step by step. Among the 414 gas tank models at this draw pattern, this unit ranks 236th for lowest energy use. That places it in the second-highest quarter of its class for energy use. A home that draws more or less hot water than the test assumes will use a different amount. That amount is not available here.

The high draw pattern fits a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 80 gallons. Its rated volume is 38 gallons. A home whose busiest hour needs more than 80 gallons would need more hot water than this rating shows. A home with lighter daily use sits below the test's draw, so the 264 therms figure would not match its actual use. How far it would differ is not available from the registry. Models in the same class with energy use below the 260 therms median can be looked up through a same-class replacement search by model number.

This text does not give a running cost because the cost depends on your state's average residential gas price. The page works it out from your ZIP, and the cost calculator for your own ZIP applies that rate to the 264 therms figure. The same rate applies to the 4 therms gap between this unit and the 260 therms class median. So the cost of that gap also depends on where you live. The installed price range appears in its own block with its own source and date. It is a modeled range and not a quote. The registry record contains no data on reliability or service life, so this page does not report either one.