Midea MGWH150ISPN

The registry lists this model with a UEF, the ratio of hot water delivered to energy used, of 0.82. This site combines that UEF with the daily hot-water draw the DOE test assigns to the medium draw pattern. The result is 135 therms of natural gas a year, computed by this site and not published by the registry. The source is the DOE CCD, retrieved 2026-09-19. The figure holds only for the medium draw pattern, which describes a typical household on a busy morning. A household that draws more or less hot water than the test day will use a different amount, and this page cannot say how much. The method for the annual cost sets out each step of the calculation.

Among the 80 models registered as a gas tankless unit at the medium draw pattern, this unit ranks 32nd lowest in energy use. Its 135 therms equals the class median of 135 therms, so the difference is 0 therms. That places it in the lower part of the ranking, below the middle position. The registry also lists a maximum flow rate in gallons per minute of 3.7. That figure describes how much hot water the unit can deliver at once, and the annual energy figure does not measure it. A household that runs several fixtures together should compare 3.7 with its own peak demand, which this page does not have.

The running cost is not stated here, because it depends on the state average residential gas price where you live. The cost calculator on your own ZIP applies that price to the 135 therms figure. Because the energy figure equals the class median of 135 therms, the cost at a given gas price is the same as for a median model in the class. The installed price appears in its own block as a modeled range, not a quote. If your household's hot-water use differs from the medium draw pattern, the selector by fuel, space and size may fit better. To compare other units in this class, find a same-class replacement by model number.