Richmond RHE40SP

It holds 37 gallons in the test, 3 gallons less than its 40-gallon sold size. It delivers 68 gallons of hot water in the test's first hour. Its tank holds 37 gallons, so reheating adds 31 gallons during the first hour. Of 763 gas storage models, 529 give more hot water in the first hour. Among gas storage models, the median first-hour rating is 78 gallons.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In tests, 75% of the energy went to hot water, so its UEF is 0.75. The daily hot water use in the test, called its draw pattern, was medium. Among 288 gas storage models with its draw pattern, none reaches a higher UEF than this one. For its type and draw pattern, the median UEF is 0.60. Of the energy spent to reheat water, 87% goes into it (its recovery efficiency).

There are 3 more basic models with the same test figures. Those basic models are sold with ECOSENSE, Rheem, and Ruud as their brand names. You can find the whole group on the page for the Rheem RHE40SP.

It may qualify for 2 rebate programs.