AMERICAN ATI-199B-N 1**

The figure of 206 therms 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, of 0.82 with the federal test's daily hot-water draw for the high draw pattern. The registry data comes from the DOE CCD, retrieved 2026-09-19. The result describes the test's draw only, so a household that uses more or less hot water than that draw will use a different amount of gas. The class median is 182 therms, which puts this model 24 therms above it. The steps behind the calculation are set out in how the annual cost is calculated.

Ranked by energy use from lowest, this model is 229th of 397, in the second-highest quarter of its class for energy use. Its maximum flow rate in gallons per minute is 5.2. The high draw pattern describes a larger household, or one where showers and laundry overlap, so this comparison fits that kind of use. At that draw, the unit uses 24 therms more gas a year than the median model of 182 therms. The registry data used here does not show whether a flow of 5.2 covers a particular home's simultaneous fixtures. Annual energy at a lower draw pattern is not available on this page, so the figure should not be applied to a smaller household.

The running cost is not stated in the text because it depends on the state average residential gas price, which differs from reader to reader. The cost calculator on your own ZIP applies that price to the 206 therms shown here. To compare ATI-199B-N 1** with other units in the same class, use a same-class replacement search by model number. The modeled installed-cost range appears in its own block on this page, with its source and date. It is not a quote and is not repeated here. This page reports registry values and one computed figure. It does not report metered use in any home, so actual gas use can differ from 206 therms.