Midea JSW40-20VHUS-NG

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.82 for this unit. This site computed 135 therms of natural gas a year from that UEF and the daily hot-water draw the DOE test assigns to the medium draw pattern, which describes a typical three- or four-person household on a busy morning. The figure applies only under that draw. It does not describe a household that uses more or less hot water than the test assumes. The calculation is this site's, not the registry's; its inputs come from DOE CCD, retrieved 2026-09-19.

Among the 80 models registered as a gas tankless unit at the medium draw pattern, this one ranks 32nd lowest in energy use, in the second-lowest quarter of its class. Its 135 therms is equal to the class median of 135 therms, so the difference is 0 therms. That suits a reader who wants to confirm where a listed unit sits for gas use at this draw. It suits a heavier-use household less, because the annual figure would then understate real consumption. The maximum flow rate in gallons per minute is 3.8; the data here do not show how that compares with a particular home's simultaneous fixtures.

The running cost is not written out here because it depends on your state's average residential gas price. Multiply 135 therms by your own rate per therm, or enter your ZIP in the cost calculator. The steps behind that figure are described in how the annual cost is calculated. The modeled installed-cost range appears in its own block on this page, with its source and date. To compare another unit in the same class, find a same-class replacement by model number. Your gas price and your household's actual draw are unknown here, so no estimate is made.