STATE FMHR-40 4**

The registry does not print the 191 therms figure. This site computed it from two inputs. The first is the registry's UEF, the ratio of hot water delivered to energy used, which is 0.58 for this model. The second is the DOE test's daily hot-water draw for the medium draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The figure holds only at the federal test's daily draw. A household that uses more or less hot water will see a different yearly total, and the registry data do not say by how much. The steps behind the calculation are set out in how the annual cost is calculated.

The tank has a rated volume of 38 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 59 gallons. DOE uses the medium draw pattern to represent a typical household's daily use, so the 191 therms figure fits a home near that level. It fits less well if lower gas use is the priority. Among the 288 gas tank models at this draw pattern, it ranks 231st lowest for energy use. Its use is 6 therms above the class median. Figures for this model at other draw patterns are not available here. A plumber matching a unit in the same class can find a same-class replacement by model number.

This page does not state a running cost in its text. The cost of 191 therms a year depends on the reader's state average residential gas price. The page computes it from the reader's ZIP, and the cost calculator on your own ZIP shows the result. The same rate applies to the 6 therms gap between this model and the 185 therms class median. Multiplying that gap by the reader's rate gives the yearly cost difference from a median model. The installed-cost range appears in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote.