Westinghouse HS180

The 206 therms figure is computed by this site, not taken from the registry. 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 0.82, from DOE CCD data retrieved on 2026-09-19. The yearly figure holds only at that test draw. A household using more or less hot water than the test assumes will use a different amount of gas, and that amount is not available here. Ranked by energy use, the model is 229th lowest of the 397 in its class. That places it in the second-highest quarter of the class for energy use. The page on how the annual cost is calculated sets out these inputs step by step.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The HS180 has a maximum flow rate in gallons per minute of 4.5. That value is the one to set against the fixtures expected to run at the same time. Flow rates for individual fixtures are not in this data, so whether 4.5 covers a given home is not stated here. A reader who wants lower energy use at the same draw pattern can compare other registered models through a same-class replacement search by model number. For a different fuel, space or size, the selector by fuel, space and size covers other classes. Neither tool changes the 206 therms figure for this model.

The running cost is not written in this text, because it depends on the reader's state average residential gas price. The page computes it from the reader's ZIP, using the 206 therms yearly figure at the high draw pattern. The cost calculator on your own ZIP shows that result. Because of the 24 therms gap to the class median noted above, this model's yearly gas cost at any one rate is higher than a median model's at that same rate. The installed price range appears in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote.