TAKAGI T-H3J-DV-N 1**

The 180 therms figure is computed by this site, not published by the registry. It combines this model's UEF, the ratio of hot water delivered to energy used, of 0.94 with the DOE test's daily hot-water draw for the high draw pattern. The UEF comes from DOE's Compliance Certification Database (CCD), retrieved 2026-09-19. The figure holds only at that test draw. A household that uses more or less hot water than the test assumes will burn a different amount of gas. The page on how the annual energy and cost figures are calculated sets out each step. The registry does not give actual gas use in a particular home, so that value is not available here.

Among the 397 gas tankless models at the high draw pattern, this unit ranks 165th lowest for energy use. Its 180 therms sits 2 therms below the class median of 182 therms. The high draw pattern stands for a larger household, or one where showers and laundry overlap. For a home that matches that pattern, the 180 therms figure is the relevant comparison. For a home with lighter use, the figure does not describe expected consumption. The registry lists a maximum flow rate in gallons per minute of 4.7 for this model. The registry does not say whether that flow covers several fixtures running at once in a given home. To compare other units at the same draw pattern, use find a same-class replacement by model number.

The running cost is not stated in this text. The cost of 180 therms of natural gas a year depends on the reader's state average residential gas price. For that reason, the page computes it from the reader's ZIP code rather than printing one figure for every reader. The cost calculator for your own ZIP code applies your state's price to the same high-draw-pattern figure. The installed price on this page appears in its own block with its source and date. It is a modeled installed-cost range, not a quote. Neither the running cost nor the installed range changes the 180 therms test figure or the 165th rank among 397 models.