Ruud PROUH40 T2 RU400-SO

It holds 36 gallons in the test, 4 gallons less than its 40-gallon sold size. It delivers 60 gallons of hot water in the test's first hour. That is 24 gallons more than its tank holds, since it reheats during the hour. Of 481 heat pump models, 371 give more hot water in the first hour. The median heat pump model gives 72 gallons in its first hour.

Its single model number, PROUH40 T2 RU400-SO, is ENERGY STAR certified. In the test, it delivered 3.83 units of hot water energy for each unit used (its UEF). It moves heat from the air rather than making it, so its UEF passes 1. The daily hot water use in the test, called its draw pattern, was medium. Of 226 heat pump models with the same draw pattern, 23 have a higher UEF. A UEF of 3.68 is the median for its type and draw pattern. When it reheats water in the test, the water gains 434% of the energy it uses.

All of its test figures are shared by 28 other basic models. Those basic models are sold with Friedrich, Rheem, and Richmond as their brand names. You can find the whole group on the page for the Rheem PROPH40 T2 RH375-SO.

It may qualify for 21 rebate programs in 20 states. It may qualify for 7 more if it meets terms its figures do not show.