LOCHINVAR ATHR-160M 1**

The 178 therms figure is computed 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 draw pattern. This model's UEF is 0.95, from DOE CCD data retrieved 2026-09-19. The result holds only at the federal test's daily draw. A home that uses more or less hot water will have a different yearly total. This page does not have data on how far any one home differs from that draw. The steps are set out in how the annual cost is calculated.

The model ranks 45th lowest in energy use among the 397 gas tankless units registered at the high draw pattern. That rank places it in the lowest quarter of its class, with the gap to the median noted above. The high draw pattern stands for a larger household, or one where showers and laundry overlap. A home of that kind matches the condition behind this figure. The model's maximum flow rate in gallons per minute is 4.8. The registry data does not show whether that covers the fixtures a given home runs at the same time. To check other units in the same class, use the same-class replacement search by model number.

A smaller household that draws less than the federal test's daily volume falls outside the condition behind 178 therms. This page does not state how much energy such a home would use. The class comparison above also applies at the high draw pattern only. The running cost is not given in this text. It depends on your state's average residential natural gas price, so the page computes it from your ZIP. The cost calculator on your own ZIP applies that rate to the 178 therms figure. The installed price range appears in its own block on this page. It is a modeled range with its source and date, not a quote.