Richmond 10CE50-HP5U30

It holds 45 gallons in the test, 5 gallons less than its 50-gallon sold size. It delivers 67 gallons of hot water in the test's first hour. Its tank holds 45 gallons, so reheating adds 22 gallons during the first hour. Of 481 heat pump models, 287 give more hot water in the first hour. The median heat pump model gives 72 gallons in the first hour of the test.

The single model number sold under it is ENERGY STAR certified. For each unit of energy it uses, 3.88 units end up in the hot water (its UEF). It moves heat from the air rather than making it, so its UEF passes 1. In the test, daily hot water use was set to medium (its draw pattern). Of 226 heat pump models with the same draw pattern, 6 have a higher UEF. For its type and draw pattern, the UEF runs from 2.59 to 4.23. When it reheats water in the test, the water gains 430% of the energy it uses.

All of its test figures are shared by 13 other basic models. The Friedrich, Rheem, and Ruud brands list one or more of them. You can find the whole group on the page for the Rheem PROPH50 T2 RH375-SO.

It may qualify for 21 rebate programs in 20 states. Another 7 programs may accept it if it meets their other terms.