A. O. SMITH T-H3-DV-N 1**

This site computed the 182 therms figure. The registry does not publish it. The calculation starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.93 for this model. It then applies the DOE test's daily hot-water draw for the high draw pattern. The registry values come from the DOE CCD, retrieved 2026-09-19. As a result, the 182 therms figure holds only at the federal test's daily draw. Your household's actual hot-water use is not in the data, so this page cannot give a figure for it. The steps behind the number are set out in how the annual cost is calculated.

The unit is rated at the high draw pattern. That pattern describes a larger household, or one where showers and laundry overlap. Its maximum flow rate in gallons per minute is 5.8. Whether 5.8 covers your fixtures running at the same time depends on their flow rates, and those are not in the data. The comparison class is the 397 models registered as a gas tankless unit at the high draw pattern. Within that class, this model sits in the second-lowest quarter for energy use. For a household with lower daily use, the registry figure does not show this model's energy use. To check other models in the same class, use the same-class replacement finder by model number.

The running cost is not stated in this text. It depends on your state's average residential gas price, so the page computes it from your ZIP. That calculation uses the 182 therms figure at the high draw pattern. This model's use is equal to its class median of 182 therms, a difference of 0 therms. At any given gas price, its running cost therefore matches the cost of a model at the class median. The installed-cost range on this page is a modeled range, not a quote, and its own block shows its source and date. To apply the 182 therms figure to your own rate, open the water heater cost calculator for your ZIP.