RELIANCE WATER HEATERS GPVT-40 2**

The 242 therms figure is computed by this site, not taken from the registry. It starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.7 for this model. It then applies the DOE test's daily hot-water draw for the high draw pattern. The inputs come from the DOE CCD, retrieved 2026-09-19. Among the 414 models registered as a gas tank at the high draw pattern, this model ranks 90th lowest in energy use. That places it in the lowest quarter of its class for energy use. The figure holds only at the test's daily draw, and the data here gives no figure for other usage. The page on how the annual cost is calculated sets out each step.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The 242 therms figure and the 18 therms gap below the class median both assume that usage. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 87 gallons for this model. Its rated volume is 38 gallons. A household whose peak-hour need exceeds 87 gallons falls outside what this rating covers. A home that draws a different amount than the test assumes will use a different amount of gas than 242 therms. The size of that difference is not available in this data. To compare other fuels or sizes, use the water heater selector by fuel, space and size.

This page does not state a running cost in the text. The cost of 242 therms of natural gas depends on the reader's state average residential gas price. For that reason, the page computes it from the reader's ZIP. The cost calculator on your own ZIP runs the same figure for another location. Homes with this same unit and the same draw can pay different amounts where gas prices differ. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote. To check a replacement against this model's 90th rank of 414, use the same-class replacement search by model number.