LOCHINVAR FMHR-30 4**

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.6 for this model. The registry does not publish an annual energy figure. This site computes 185 therms of natural gas per year from that 0.6 and the DOE test's daily hot-water draw for the medium draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The class median for the 288 gas tank models at this draw pattern is 185 therms, so the difference is 0 therms. The model ranks 89th lowest in energy use of 288, which puts it in the second-lowest quarter of its class. This page does not show how many models share the median value. The calculation method describes each step.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 63 gallons for this model, and the rated volume is 29 gallons. The energy figure applies to a typical three- or four-person household using the medium draw pattern. For a household that matches that pattern, 185 therms is the number to check against the registry entry. It does not describe a household whose daily hot-water use is well above or below the medium draw pattern, because the test does not measure that use. Whether 63 gallons covers your busiest hour depends on your own fixtures and habits, which this data does not include. The water heater selector filters by fuel, space and size.

Running cost is not stated in this text because it depends on your state's average residential gas price. To estimate it, apply the price per therm that covers you to 185 therms; the cost calculator does this from your ZIP. The result holds only for the medium draw pattern, so a household that draws more or less hot water than the test's daily draw will see a different total. An installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To look at other units in the same class, find a same-class replacement by model number.