Mizudo FDG-CS120

This site computed the 132 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 daily hot-water draw in the DOE test for the medium draw pattern. For this model the UEF is 0.84, taken from the DOE CCD and retrieved 2026-09-19. The result holds only at that test draw. A household that uses more or less hot water than the medium pattern will have a different annual figure. The registry does not say what that figure would be. The conversion steps are explained in how the annual cost is calculated.

This model ranks 23rd lowest for energy use among the 80 models registered as a gas tankless unit at the medium draw pattern. Its 132 therms sits 3 therms below the class median of 135 therms. That places it below the median but not at the lowest end of the class. The comparison fits a household whose daily use is close to the medium pattern, which DOE treats as a typical household. Its maximum flow rate in gallons per minute is 3. A home that often runs several outlets at once may need more than 3 gallons per minute. This page does not show how the unit performs above that rate. To compare against other fuels, spaces and sizes, use the selector by fuel, space and size.

The running cost is not written here because it depends on the average residential gas price in your state. Enter your ZIP in the cost calculator on your own ZIP, and the page multiplies the 132 therms of natural gas by that price. The result still assumes the medium draw pattern, so it reflects test conditions, not your bill. The registry does not record your actual rate, tariff tiers or hot-water habits, so this page cannot know them. The installed price has its own block, with its source and date. It is a modeled range, not a quote. To check other units in this class, use find a same-class replacement by model number.