STATE FMDV-50 2**

The 194 therms figure is computed by this site. The registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the medium pattern. For the FMDV-50 2**, the UEF is 0.57, as listed in the DOE CCD retrieved 2026-09-19. The yearly figure therefore holds only at the federal test's daily draw. A household that draws more hot water than the test assumes will use more gas than 194 therms, and one that draws less will use less. The registry does not report measured use in real homes, so field consumption for this model is not available. The steps from UEF to a yearly figure are set out in how the annual cost is calculated.

The FMDV-50 2** lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 67 gallons. Its rated volume is 47 gallons. These figures describe a unit tested against a typical household's busy-morning demand. It fits a reader whose peak use stays within 67 gallons in the first hour and who accepts gas use 9 therms above the class median. It fits less well where lower gas use is the aim. Ranked 278th lowest of 288, it uses more gas than most gas tank models at this pattern at the same test draw. A plumber or seller checking alternatives can find a same-class replacement by model number.

This page does not state a running cost in the text. The cost of 194 therms a year depends on the reader's state average residential gas price, so the page computes it from the reader's ZIP. The cost calculator on your own ZIP applies that rate to this model's yearly figure at the medium pattern. The result holds only at the federal test's daily draw, as noted above. An installed price range for the FMDV-50 2** is not published. Its ratings lie outside the range the cost database's model was fitted on. The site does not stretch that model past its fitted range, so no installed price is estimated here.