AMERICAN FMDV-40 2**

The annual figure of 188 therms is calculated by this site, not published by the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.59. It also uses the daily hot-water draw that the DOE test assigns to the medium draw pattern. The source is the DOE CCD, retrieved 2026-09-19. This model sits 3 therms above the class median of 185 therms. Its rank of 186th lowest among 288 models places it in the second-highest quarter of its class for energy use. The steps of the calculation are set out on the water heater methodology page.

This figure applies only to the medium draw pattern, which the registry describes as a typical household using hot water on a busy morning. The model 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 57 gallons. A household whose use resembles that pattern can compare 188 therms directly with the class median of 185 therms. A household that draws more or less hot water than the test assumes cannot rely on this figure. The registry data here gives no annual energy for other draw patterns. The water heater selector filters by fuel, space and size.

Running cost is not stated in this text because it depends on the state average residential gas price, and the text does not know your rate. The 188 therms of natural gas is the quantity that your price per therm is applied to, and the cost calculator for your own ZIP does that step. The modeled installed-cost range appears in its own block with its source and date. It is a range, not a quote, and it is not repeated here. This page does not measure use in a home: 188 therms and the 3 therms difference from the median of 185 therms both come from the federal test's draw. For a same-class unit, you can find a replacement by model number starting from FMDV-40 2**.