Ariston GN50T2-3-*

It holds 47 gallons in the test, 3 gallons less than its 50-gallon sold size. Starting full, it gives 86 gallons of hot water in its first hour of use. Reheating lets it give 39 gallons beyond the 47 gallons in its tank. Among 763 gas storage models, 162 have a higher first-hour rating. Among gas storage models, the median first-hour rating is 78 gallons.

It was not listed as ENERGY STAR certified on Oct 26, 2026. In tests, 66% of the energy it uses ends up as hot water (UEF 0.66). The daily hot water use in the test, called its draw pattern, was high. Among 434 gas storage models on its draw pattern, 213 have a higher UEF. For its type and draw pattern, its UEF sits at the median. The water took in 80% of the energy used to reheat it (its recovery efficiency).

Its test figures match those of 2 other basic models. Of those, one or more are under the AMERICAN STANDARD WATER HEATERS and Lennox brands. For the full group, see the AMERICAN STANDARD WATER HEATERS GN50T2-3-*.