RELIANCE WATER HEATERS GDVNT-50L 1**

This site computed the 260 therms figure; the registry does not list it. The calculation 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 pattern. For this model the UEF is 0.65, from DOE CCD data retrieved 2026-09-19. Among the 414 gas tank models at this pattern, it ranks 204th lowest in energy use. That places it in the second-lowest quarter of its class, although its figure is equal to the 260 therms median. If your home draws more or less hot water than the test assumes, your yearly use will differ. The size of that difference is not available here. The page on how the annual cost is calculated explains each step.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The 260 therms figure applies to a home that uses that much hot water. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 84 gallons. That rating comes from a tank with a rated volume of 48 gallons. The registry gives both values, and neither changes the class comparison with the other 414 models. If you are checking a unit against a home's peak morning use, compare your needs with the 84 gallons. The water heater selector by fuel, space and size filters other registered models by those same inputs.

In a smaller household with lighter daily use, the 260 therms figure will not match your own use. It assumes the high draw pattern, and this page has no figure for a lower pattern. The text does not state a running cost because the cost depends on your state's average residential gas price. The page works it out from your ZIP in the cost calculator for your own ZIP, using the same 260 therms input. A separate block shows the installed price as a modeled range with its own source and date, not as a quote. To check another unit from the same class of 414 models, you can find a same-class replacement by model number.