Friedrich PROG40-40N RH67 PDV

It holds 38 gallons in the test, 2 gallons less than its 40-gallon sold size. It delivers 67 gallons of hot water in the test's first hour. That is 29 gallons more than its tank holds, since it reheats during the hour. Of 763 gas storage models, 552 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 the test, 37% of its energy does not reach the hot water (UEF 0.63). In the test, daily hot water use was set to medium (its draw pattern). Among 288 gas storage models on its draw pattern, 61 have a higher UEF. For its type and draw pattern, the median UEF is 0.60. Of the energy spent to reheat water, 79% goes into it (its recovery efficiency).

There are 3 more basic models with the same test figures. Those basic models are sold with Rheem, Richmond, and Ruud as their brand names. You can find the whole group on the page for the Rheem PROG40-40N RH67 PDV.