RELIANCE WATER HEATERS GPVL-50 2**

The 235 therms figure was computed by this site, not taken from the registry. It combines the model'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. The UEF here is 0.72, from the DOE CCD as retrieved on 2026-09-19. There are 414 models registered as a gas tank at the high draw pattern. For energy use, this model ranks 50th lowest of them. That places it in the lowest quarter of its class. The gap to the class median is 25 therms a year, under the same test draw. The steps behind the figure are set out in how the annual cost is calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. For that use, the registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 79 gallons. The rated volume is 49 gallons. If your household uses less hot water than the test assumes, the 235 therms figure does not describe your use. This data does not show energy use at other draw levels. The figure also covers natural gas only, so it does not apply to a home without a gas supply. To compare models by fuel, space and size, use the water heater selector.

This page does not state a running cost in the text. The cost of 235 therms a year depends on your state's average residential gas price. The page computes that cost from your ZIP in the cost calculator for your own ZIP, at the same high draw pattern. The page shows an installed price range in its own block, with its source and date. That range is a modeled installed-cost range, not a quote. If you are checking a replacement for this unit, you can find a same-class replacement by model number among other gas tank models at the high draw pattern. You can then read their energy use against the 260 therms class median.