Richmond RHE40S

It holds 37 gallons in the test, 3 gallons less than its 40-gallon sold size. Over one hour from a full tank, it gave 87 gallons in the test (its first-hour rating). Reheating lets it give 50 gallons beyond the 37 gallons in its tank. In the first hour, 143 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, 17% of its energy does not reach the hot water (UEF 0.83). Its test simulated a day of high hot water use (its draw pattern). Of 434 gas storage models with the same draw pattern, 46 have a higher UEF. For its type and draw pattern, the median UEF is 0.66. When it reheats water in the test, 92% of the energy it uses ends up in the water.

Its test figures match those of 3 other basic models. The ECOSENSE, Rheem, and Ruud brands list one or more of them. For the full group, see the Rheem RHE40S page.

In 2 states, 2 rebate programs may accept it.