STATE FMDV-40 2**

The 188 therms figure comes from this site, not from the registry. 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. This unit's UEF is 0.59. The figure holds only at that test draw. A household that uses more or less hot water will use a different amount of gas. The UEF source is the DOE CCD, retrieved 2026-09-19. The steps from UEF to a yearly figure are set out in how the annual energy and cost figures are calculated.

Within its class, the STATE FMDV-40 2** ranks 186th of 288, counted from lowest energy use. That puts it in the quarter of the class just above the median, 3 therms over the 185 therms median. The medium pattern represents a typical mid-sized household. For a home whose use matches that pattern, the 188 therms figure applies as stated. The tank's rated volume is 38 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 57 gallons. A household that needs more than 57 gallons in its busiest hour would go beyond this rating. Registered models in the same class can be compared through a same-class replacement search by model number.

The text on this page does not state a running cost. The cost of 188 therms of natural gas depends on your state's average residential gas price. For that reason, the page computes it from your ZIP. The 3 therms gap to the class median becomes a cost difference only at your own rate. Without that rate, the cost difference is not available here. You can enter your ZIP in the running cost calculator for your own ZIP. The installed price range appears in its own block with its source and date. It is a modeled range, not a quote. How far a real invoice differs from that range is not known from the registry data.