STATE T-H3-DV-N 1**

This site computes the 182 therms figure; the registry does not publish it. The calculation starts from the model's UEF, the ratio of hot water delivered to energy used, which is 0.93. That UEF is applied to the daily hot-water draw the DOE test sets for the high draw pattern. The UEF comes from the DOE Compliance Certification Database, retrieved 2026-09-19. The result holds only at that test draw. A home that draws more or less hot water each day will use more or less gas. Among the 397 gas tankless units registered at the high draw pattern, this model ranks 183rd lowest in energy use. That places it in the second-lowest quarter of its class. The steps are set out in how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model's maximum flow rate in gallons per minute is 5.8. Its 182 therms figure fits a home whose daily hot-water use is close to the test draw for that pattern. For a smaller household that draws less hot water, the annual figure would likely overstate real gas use. How much it would overstate is not available, because the registry reports only the test condition. A home whose fixtures running at once need more than 5.8 falls outside what this rating describes. 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 computes it from your ZIP. Because this model's use differs from the class median by 0 therms, its running cost at any given gas price matches that of a median model in the class. The gap in cost only widens or narrows with the energy gap, and here that gap is 0 therms. To see the figure for your own rate, use the cost calculator on your ZIP. The installed price range sits in its own block with its source and date. It is a modeled installed-cost range, not a quote.