AMERICAN T-H3J-DV-N 1**

The 180 therms figure 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, with the DOE test's daily hot-water draw for the high draw pattern. For this model the UEF is 0.94. The figure holds only at that test draw. A household that uses more or less hot water than the test assumes will use a different amount of gas. This page cannot say how much different. The registry data comes from the DOE CCD, retrieved 2026-09-19. The steps behind the figure are set out in how the annual energy and cost figures are calculated.

This model is compared with the 397 models registered as a gas tankless unit at the high draw pattern. It ranks 165th lowest in energy use among them, which places it in the second-lowest quarter of its class. Its use is 2 therms a year below the class median of 182 therms at the test draw. It is below the median but not in the lowest quarter. The high draw pattern describes a larger household, or one where showers and laundry overlap. For a smaller household, the high-pattern figure does not match its conditions, and a figure for a lower pattern is not available here. The registry lists a maximum flow rate in gallons per minute of 4.7. To compare models in the same class, use the same-class replacement search by model number.

The running cost is not written in this text, because it depends on your state's average residential natural gas price. The page computes it from your ZIP, using the 180 therms figure at the high draw pattern. For the same reason, no cost is given for the 2 therms gap to the class median; that gap would also be priced at your own rate. The installed price range appears in its own block with its source and date. It is a modeled installed-cost range, not a quote. To see the running cost at your own rate, use the running cost calculator for your ZIP.