RELIANCE WATER HEATERS GCG-50 4**

This site calculates the 273 therms figure; the registry does not publish it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the high pattern. This unit's UEF is 0.62, taken from the DOE Compliance Certification Database and retrieved 2026-09-19. The result applies only at that test draw. A home that uses more or less hot water will burn a different amount of gas. The steps are set out in how the annual energy and cost figures are calculated. The high pattern describes a larger household, or one where showers and laundry overlap. For a home that uses less hot water than the test assumes, this figure overstates its use.

Among gas tank models tested at the high draw pattern, the RELIANCE WATER HEATERS GCG-50 4** ranks 367th lowest in energy use out of 414. That puts it in the highest quarter of its class for energy use, above the class median given in the summary. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 81 gallons. Its rated volume is 48 gallons. If a plumber or seller is checking a listing, these registry values are the ones to match. A reader who needs a same-class model with a lower rank for energy use can find a same-class replacement by model number.

This text does not state the running cost. It depends on your state's average residential natural gas price, so the page calculates it from your ZIP code. The yearly cost at the high draw pattern is 273 therms multiplied by that price. A different price gives a different result. The cost calculator on your own ZIP applies your rate to this model. The installed price range has its own block on this page, with its source and date. It is a modeled range, not a quote. Two things are not available here. One is this model's energy use at draw patterns other than high. The other is its gas use in any specific home, because the registry data covers only the federal test.