Midea MGWH199IXPP

This site calculated the 178 therms figure; the registry does not publish it. The calculation uses the registry's 0.95 UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the high draw pattern. The registry data come from the DOE CCD and were retrieved on 2026-09-19. The figure applies only at that test draw, and this page does not have the gas use for any particular home. Among the 397 gas tankless models registered at the high draw pattern, this unit has the 45th lowest energy use. That puts it in the lowest quarter of its class, 4 therms a year below the 182 therms median. The method behind the annual energy and cost figures lists each input.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The 45th rank and the 4 therms gap apply only within that comparison. This unit's registered maximum flow rate in gallons per minute is 5.7. A household whose use matches a lower draw pattern falls outside this comparison. The registry data on this page do not include this model's energy use at a lower pattern. A reader comparing it with a unit of another fuel or heater type is also outside this class. The water heater selector by fuel, space and size covers those cases. The same-class replacement search by model number lists other models in this class.

The text on this page does not state a running cost. The cost depends on the reader's state average residential gas price, so the page calculates it from the reader's ZIP. It uses two inputs: the 178 therms a year and that local rate. The 4 therms gap to the class median is priced the same way, so its cost also varies by state. Both results assume the high draw pattern at the DOE test's daily draw. The running-cost calculator for your own ZIP gives the result for your rate. The installed price appears in a separate block as a modeled range, not a quote. That block also shows its source and date.