GSW WATER HEATERS GPDX-50L 3**

The figure of 232 therms is natural gas use for one year at the high draw pattern, meaning the federal test's daily hot-water draw for that pattern. It is not a metered reading from a home. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.73 for the GPDX-50L 3** from GSW WATER HEATERS, and from the DOE test's daily draw. The registry itself does not publish an annual figure. The DOE CCD data was retrieved on 2026-09-19. A home with a different draw pattern or different usage will use a different amount, and this page has no figure for those conditions.

Within its class, the unit ranks 33rd lowest energy use of 414 models registered as a gas tank at the high draw pattern. That places it in the lowest quarter of the class, measured against the class median of 260 therms. The comparison covers energy use only and says nothing else about the models. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 118 gallons, and the rated volume is 48 gallons. Both values are inputs to sizing. The figure fits a household that matches the high draw pattern. For a household with a lower draw, the annual energy use is not available here and should not be read from this page.

The running cost is not stated in the text, because it depends on the state average residential gas price, which differs by reader. The cost calculator applies that price for your ZIP to the 232 therms shown here. The steps behind it are described in how the annual cost is calculated. If your household does not match the high draw pattern, the selector by fuel, space and size narrows the options, and a same-class replacement by model number lets you compare another unit. A modeled installed-cost range appears in its own block on this page, with its source and date. It is a modeled range, not a quote.