AMERICAN ATM-160M-N 1**

The 178 therms figure is calculated by this site. The registry does not publish it. 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 pattern. This model's UEF is 0.95. The source is the DOE Compliance Certification Database, retrieved 2026-09-19. The figure holds only at the federal test's draw, so a home using a different amount of hot water will use a different amount of gas. The steps are set out in how the annual cost is calculated. Among the 397 gas tankless models at the high draw pattern, this unit ranks 45th lowest for energy use.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. A home that matches that description is the case the 178 therms figure describes. For this unit, the capacity figure is the maximum flow rate in gallons per minute, listed as 4.8. The registry does not say how many fixtures that flow can supply at once, so that figure is not available here. A household with lower daily hot-water use falls outside the test's high draw. For such a home, the 178 therms figure does not describe its use, and this data gives no replacement figure. To compare this unit only with others at the same draw pattern, use find a same-class replacement by model number.

The text gives no running cost. The cost depends on the reader's state average residential gas price applied to the 178 therms used at the test draw. The page therefore computes it from the reader's ZIP, and the result appears in the cost calculator on the reader's own ZIP. The 4 therms gap below the 182 therms class median has a cost value only at the reader's own gas rate. That value is not stated here. The installed-cost range appears in its own block with its source and date. It is a modeled range, not a quote, and this commentary does not restate its figures.