Midea MGWH180IXNP

The 178 therms figure is computed by this site, not published by the registry. The inputs are the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for this draw pattern. The UEF for this model is 0.95. The registry data comes from DOE CCD, retrieved 2026-09-19. The figure holds only for natural gas at that test draw. A household that uses more or less hot water than the test assumes will use a different amount, and this page has no measured figure for that.

Among the 397 models registered as a gas tankless unit at the high draw pattern, this model has the 45th lowest energy use. That places it in the lowest quarter of its class. Its 178 therms is 4 therms below the class median of 182 therms, a gap that is small compared with the median itself. The figure applies to a larger household, or one where showers and laundry overlap. It does not describe a household with a smaller draw, and no figure for another draw pattern is available here. The maximum flow rate in gallons per minute is 5.2; the annual figure is not derived from it. To compare by fuel, space and size, use the water heater selector, or find a same-class replacement by model number.

The running cost is not stated in the text, because it depends on the average residential gas price in your state. The cost calculator on your own ZIP applies that price to the 178 therms figure for the high draw pattern. The method behind the annual cost explains how the registry's UEF and the test draw are combined. The same price also decides what the 4 therms gap to the class median of 182 therms amounts to, so that gap has no fixed cost on this page. The installed price range appears in its own block with its source and date, as a modeled range and not a quote, and it is not repeated here.