State GCR-30R 4**

It holds 29 gallons in the test, 1 gallon less than its 30-gallon sold size. Starting full, it gives 62 gallons of hot water in its first hour of use. Its tank holds 29 gallons, so reheating adds 33 gallons during the first hour. In the first hour, 671 of the 763 gas storage models give more hot water. 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, 60% of the energy went to hot water, so its UEF is 0.60. The daily hot water use in the test, called its draw pattern, was medium. Of 288 gas storage models with the same draw pattern, 88 have a higher UEF and 103 a lower one. Its UEF is the median for its type and draw pattern. When it reheats water in the test, 73% of the energy it uses ends up in the water.

It is sold as GS6-30-OCTR 4**, GS6-30-OCTR 4*1, and GSX-30-OCTR 4**. Its test figures match those of 5 other basic models. Each of the 5 other brands lists one of them. You can find the whole group on the page for the A. O. Smith GCR-30R 4**.