Midea MGWH199IXNN

This site computed the 178 therms figure. The registry does not publish it. The figure 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 high pattern. For this model the UEF is 0.95, taken from the DOE CCD as retrieved on 2026-09-19. Among the 397 models registered as a gas tankless unit at the high draw pattern, it ranks 45th lowest for energy use. That puts it in the lowest quarter of its class, below the class median given above. The inputs and steps behind the figure are set out in how the annual cost is calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. A plumber or seller checking a match for that kind of home can compare the 178 therms figure directly with that use. The data lists this unit's maximum flow rate in gallons per minute as 5.7. The figure does not describe a household whose daily hot-water use differs from the federal test draw. Such a home will use a different amount of gas, and this page does not have that amount. The 4 therms gap to the class median is also measured only at the test draw, not at other usage levels.

This text gives no running cost because the cost depends on the reader's own gas rate. The page works it out from the reader's ZIP, using the state average residential gas price, and applies that price to 178 therms a year at the high draw pattern. The cost calculator on your own ZIP shows that result. The installed-price range appears in its own block with its source and date. It is a modeled range, not a quote. To compare this unit with others in its class, you can find a same-class replacement by model number among the 397 gas tankless models at the high draw pattern.