Rinnai REHP65C

It holds 60 gallons in the test, 5 gallons less than its 65-gallon sold size. Over one hour from a full tank, it gave 80 gallons in the test (its first-hour rating). Reheating lets it give 20 gallons beyond the 60 gallons in its tank. In the first hour, 146 of the 481 heat pump models give more hot water. 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. In the test, it gives 3.90 units of hot water energy per unit it uses (its UEF). Pulling heat from the air lets its UEF pass 1. Its test simulated a day of high hot water use (its draw pattern). Among 237 heat pump models on its draw pattern, 97 have a higher UEF. On its draw pattern, the median heat pump UEF is 3.88. When it reheats water in the test, the water gains 450% of the energy it uses.

There are 13 more basic models with the same test figures. In all, 9 other brands list one or more of them. For the full group, see the Rinnai REHP65.

It may qualify for 20 rebate programs in 19 states. Another 7 programs may accept it if it meets their other terms.