State GCRX-50 2**

It holds 49 gallons in the test, 1 gallon less than its 50-gallon sold size. Starting full, it gives 99 gallons of hot water in its first hour of use. Its tank holds 49 gallons, so reheating adds 50 gallons during the first hour. In the first hour, 89 of the 763 gas storage models give more hot water. Among gas storage models, the median first-hour rating is 78 gallons.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In tests, 61% of the energy it uses ends up as hot water (UEF 0.61). Its test ran at the high level of daily hot water use. Among 434 gas storage models on its draw pattern, 419 have a higher UEF. For its type and draw pattern, the UEF runs from 0.61 to 0.90. Of the energy spent to reheat water, 75% goes into it (its recovery efficiency).

It is sold under 6 model numbers in all. All of its test figures are shared by 4 other basic models. Each of them is listed under a different brand. You can find the whole group on the page for the A. O. Smith GCRX-50 2**.