STATE GPVL-40 2**

The 165 therms figure does not appear in the registry itself. This site computed it from two inputs. The first is the model's UEF, the ratio of hot water delivered to energy used. The second is the DOE test's daily hot-water draw for the medium draw pattern. The registry lists a UEF of 0.67 for this model, from DOE CCD data retrieved 2026-09-19. The result holds only at that test draw. A household that uses more hot water each day than the medium pattern assumes will use more gas than 165 therms. A household that uses less will use less. The size of that difference is not available here, because the registry gives no figure outside the test draw. The steps behind the annual energy and cost figures are set out separately.

In DOE's test, the medium draw pattern stands for a typical household. For peak demand, the registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank. For this model it is 73 gallons, from a rated volume of 38 gallons. A home whose busiest hour needs no more than 73 gallons stays within what DOE measured. A home whose busiest hour needs more than 73 gallons falls outside that measurement. For that home, both the 165 therms figure and the first hour rating describe a lighter load than the tank will actually carry. To compare other units on the same terms, use the water heater selector by fuel, space and size.

Among the 288 gas tank models at the medium draw pattern, this model ranks 20th lowest in energy use. That places it in the lowest quarter of its class. The 20 therms gap to the class median, noted above, is measured in therms of natural gas, not in cost. The running cost depends on your state's average residential gas price, so this text gives no cost figure. The page computes the cost from your ZIP instead, or you can enter it in the running cost calculator for your own ZIP. The installed price range appears in its own block, with its source and date. It is a modeled range, not a quote.