STATE GPVT-50 2**

The registry does not publish the 235 therms figure; this site calculated 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 draw pattern. This model's UEF is 0.72, taken from DOE CCD data retrieved 2026-09-19. The figure applies only at that test draw. A household that uses more hot water than the test assumes will use more gas, and one that uses less will use less. Among the 414 gas tank models at the high draw pattern, this unit ranks 50th lowest for energy use. That puts it in the lowest quarter of its class. The page on how this site calculates annual energy and cost sets out each step.

The high draw pattern stands for 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 97 gallons. Its rated volume is 48 gallons. A home whose busiest hour needs more than 97 gallons asks for more than the rating covers. For a home with a smaller daily draw, the 235 therms figure does not describe its gas use. An estimate at a lower draw is not available here. A home without a natural gas supply also falls outside this class. To compare other fuels, spaces and tank sizes, use the water heater selector by fuel, space and size.

This text does not state the running cost. It depends on your state's average residential natural gas price, applied to the 235 therms of yearly use. The page works it out from your ZIP, and the cost calculator for your own ZIP runs the same calculation. The 25 therms gap below the class median becomes a cost difference only at your own rate, so this page gives no fixed saving. The installed-cost range on this page is a modeled range, not a quote, and it has its own source and date. If you are matching a unit to the GPVT-50 2**, you can find a same-class replacement by model number.