A. O. Smith GCRL-40 2**

It holds 38 gallons in the test, 2 gallons less than its 40-gallon sold size. Starting full, it gives 64 gallons of hot water in its first hour of use. Reheating lets it give 26 gallons beyond the 38 gallons in its tank. Of 763 gas storage models, 629 give more hot water in the first hour. The median gas storage model gives 78 gallons in its first hour.

It was not listed as ENERGY STAR certified on Oct 26, 2026. In tests, 58% of the energy went to hot water, so its UEF is 0.58. In the test, daily hot water use was set to medium (its draw pattern). Of 288 gas storage models with the same draw pattern, 230 have a higher UEF and 11 a lower one. On its draw pattern, the median gas storage UEF is 0.60. Of the energy spent to reheat water, 74% goes into it (its recovery efficiency).

Its 2 model numbers are GCRL-40 2** and GCRL-40 2*1. There are 8 more basic models with the same test figures. Each of them is listed under a different brand.