Rheem PROPH50 T2 RH400-15

It holds 45 gallons in the test, 5 gallons less than its 50-gallon sold size. It delivers 52 gallons of hot water in the test's first hour. That is 7 gallons more than its tank holds, since it reheats during the hour. Among 481 heat pump models, 439 have a higher first-hour rating. Among heat pump models, the median first-hour rating is 72 gallons.

It is ENERGY STAR certified under its single model number. In the test, it delivered 3.75 units of hot water energy for each unit used (its UEF). Pulling heat from the air lets its UEF pass 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, 59 have a higher UEF and 129 a lower one. A UEF of 3.68 is the median for its type and draw pattern. While it reheats, the water gains 423% of the energy it uses (its recovery efficiency).

Its test figures match those of 10 other basic models. The Friedrich, Richmond, and Ruud brands list one or more of them. For the full group, see the Rheem PROPH50 T2 RH375-15 page.

It may qualify for 17 rebate programs. Another 5 rebate programs may accept it if it meets their other terms.