ECOSENSE RHE40SP

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 68 gallons in the test (its first-hour rating). Reheating lets it give 31 gallons beyond the 37 gallons in its tank. Of 763 gas storage models, 529 give more hot water in the first hour. The median gas storage model gives 78 gallons in its first hour.

As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In the test, 25% of its energy does not reach the hot water (UEF 0.75). Its test simulated a day of medium hot water use (its draw pattern). Among 288 gas storage models with its draw pattern, none reaches a higher UEF than this one. A UEF of 0.60 is the median for its type and draw pattern. When it reheats water in the test, 87% of the energy it uses ends up in the water.

Its test figures match those of 3 other basic models. Of those, one or more are under the Rheem, Richmond, and Ruud brands. For the full group, see the Rheem RHE40SP page.

In 2 states, 2 rebate programs may accept it.