State GCRL-50 2**

It holds 49 gallons in the test, 1 gallon less than its 50-gallon sold size. Over one hour from a full tank, it gave 78 gallons in the test (its first-hour rating). That is 29 gallons more than its tank holds, since it reheats during the hour. Of 763 gas storage models, 366 give more hot water in the first hour. Its first-hour rating matches the median for gas storage models.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In tests, 62% of the energy it uses ends up as hot water (UEF 0.62). Its test ran at the high level of daily hot water use. Among 434 gas storage models on its draw pattern, 386 have a higher UEF. On its draw pattern, the median gas storage UEF is 0.66. The water took in 73% of the energy used to reheat it (its recovery efficiency).

It is the basic model for GS6-50-BCS 2** and GS6-50-BCS 2*1. Its test figures match those of 3 other basic models. Of those, one or more are under the A. O. Smith, American, and Lochinvar brands. For the full group, see the A. O. Smith GCRL-50 2**.