Midea MGWH199IXNP

The figure of 178 therms is computed by this site, not published by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, which is 0.95 for this model, with the DOE test's daily hot-water draw for the high draw pattern. The source is DOE CCD, retrieved 2026-09-19. Among the 397 models registered as a gas tankless unit at this draw pattern, this one ranks 45th lowest in energy use, which is in the lowest quarter of its class. The class median is 182 therms, so this model sits 4 therms below it. No figure for any other draw pattern is available on this page.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The figure of 178 therms belongs to that kind of use, so it is the relevant comparison for a household that matches it. For a household with lighter use, a different draw pattern applies, and this page has no energy figure for it. The registry lists the maximum flow rate in gallons per minute as 5.7. The data here does not state how many fixtures that rate can serve at once, so that is unknown. To compare by fuel, space and size, use the water heater selector, or look up a same-class replacement by model number for MGWH199IXNP.

The running cost is not stated here because it depends on the state average residential gas price where you live. Multiply 178 therms by your own price per therm to get a yearly figure at the high draw pattern. The cost calculator on your own ZIP does this for you, and how the annual cost is calculated explains the method. A model at the class median of 182 therms would use 4 therms more per year than this one at the same draw pattern, so the difference in cost at any rate is 4 therms multiplied by that rate. The modeled installed-cost range is shown in its own block, as a range and not a quote, and is not repeated here.