STATE T-H3J-DV-N 1**

The 180 therms figure is calculated by this site. It is not taken directly from the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.94 for this model. That ratio is applied to the DOE test's daily hot-water draw for the high draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The result applies only at the federal test's draw. This data does not show how much hot water your own household uses, so your actual gas use is not known here. To check each step, see how the annual cost is calculated. This data has no figure for this model at any other draw pattern.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. This model is compared only with the 397 models registered as a gas tankless unit at that pattern. Its rank of 165th, noted above, puts it in the second-lowest quarter of its class for energy use. A smaller household with lower daily use falls outside the condition behind the 180 therms figure. For that household, this page cannot say what the unit would use. Its maximum flow rate in gallons per minute is 4.7. Whether that covers several fixtures running at once depends on their flow rates, which this page does not have. To compare other units by fuel, space and size, use the water heater selector.

The running cost does not appear in this text. It depends on your state's average residential gas price, so the page calculates it from your ZIP. The calculation starts from this model's 180 therms of natural gas a year at the high draw pattern. You can run it on your own rate with the cost calculator for your ZIP. The installed price range has its own block, with its source and date. It is a modeled installed-cost range, not a quote. If you are matching a unit already in place, find a same-class replacement by model number, starting from T-H3J-DV-N 1**.