RELIANCE WATER HEATERS GCR-30R 4**

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.6 for this model. This site combined that value with the daily hot-water draw of the federal test to compute 185 therms of natural gas per year. The registry itself does not publish that annual figure. It applies only to the medium draw pattern, and the source is DOE CCD, retrieved 2026-09-19. Among the 288 models registered as a gas tank at this draw pattern, the median is 185 therms. This model differs from that median by 0 therms. It ranks 89th lowest in energy use of 288, which places it in the second-lowest quarter of its class.

The figure suits a household whose hot-water use matches the medium draw pattern, a typical household on a busy morning. For that use, 185 therms is the number to check against the registry entry. The tank has a rated volume of 29 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 62 gallons. The figure does not describe a household with a different draw pattern, because it was computed for the medium pattern only, and this page does not estimate any other. A reader comparing options by fuel, space and size can use the water heater selector.

Running cost is not stated in the text, because it depends on the state average residential gas price where the reader lives. The cost calculator applies the reader's ZIP to the 185 therms figure and returns a cost on the reader's own rate. The methodology page explains how that calculation works. An installed price range is also not published for this model. Its ratings, a UEF of 0.6, a first hour rating of 62 gallons and a rated volume of 29 gallons, lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To look for a same-class unit, find a replacement by model number starting from GCR-30R 4**.