State FMHR-30 4**

It holds 29 gallons in the test, 1 gallon less than its 30-gallon sold size. Over one hour from a full tank, it gave 63 gallons in the test (its first-hour rating). Reheating lets it give 34 gallons beyond the 29 gallons in its tank. In the first hour, 655 of the 763 gas storage models give more hot water. The median gas storage model gives 78 gallons in the first hour of the test.

As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In the test, 40% of its energy does not reach the hot water (UEF 0.60). Its test ran at the medium level of daily hot water use. Among 288 gas storage models on its draw pattern, 88 have a higher UEF. On its draw pattern, its UEF is also the median gas storage UEF. Of the energy spent to reheat water, 79% goes into it (its recovery efficiency).

It is the basic model for GS6 30 MHG 4** and SCI 30 MHG 4**. All of its test figures are shared by 5 other basic models. Each of the 5 other brands lists one of them. For the full group, see the A. O. Smith FMHR-30 4** page.