Lennox WHGS030T35NANS****

It holds 29 gallons in the test, 1 gallon less than its 30-gallon sold size. It delivers 70 gallons of hot water in the test's first hour. Its tank holds 29 gallons, so reheating adds 41 gallons during the first hour. Among 763 gas storage models, 510 have a higher first-hour rating. The median gas storage model gives 78 gallons in the first hour of the test.

As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In tests, 60% of the energy it uses ends up as hot water (UEF 0.60). Its test ran at the medium level of daily hot water use. Among 288 gas storage models on its draw pattern, 88 have a higher UEF. Its UEF is the median for its type and draw pattern. The water took in 78% of the energy used to reheat it (its recovery efficiency).

All of its test figures are shared by 2 other basic models. Those basic models are sold with AMERICAN STANDARD WATER HEATERS and Ariston as their brand names. You can find the whole group on the page for the AMERICAN STANDARD WATER HEATERS GN30T1-3-*.