ARISTON GN40T1-3-*

The figure of 188 therms is computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.59 with the daily hot-water draw that the federal test assigns to the medium draw pattern. The source is DOE CCD, retrieved 2026-09-19. The result holds for natural gas and for the medium draw pattern only. The daily draw value itself is not shown in this data, and no figure for another draw pattern is available here. The method behind the annual figure is documented on its own page.

Among the 288 models registered as a gas tank at the medium draw pattern, this unit ranks 186th lowest in energy use. That places it in the second-highest quarter of its class for energy use. Its 188 therms sits 3 therms above the class median of 185 therms, both measured at the medium draw pattern. The data does not show how the other models are spread around the median, so no wider comparison is made. The figure suits a household whose hot-water use matches the medium draw pattern, or anyone checking a listing against the registry. It does not describe a household whose daily use differs from the test's draw, because the 188 therms would then not apply.

Two capacity figures come from the same registry entry. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 68 gallons, and the rated volume is 38 gallons. Running cost is not written in the text because it depends on the state average residential gas price where the reader lives. The cost calculator applies a ZIP to the 188 therms figure. The installed price range appears in its own block, as a modeled range and not a quote. To compare against another unit of the same class, find a same-class replacement by model number using GN40T1-3-*.