Rinnai REHP65W*

It holds 61 gallons in the test, 4 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 19 gallons beyond the 61 gallons in its tank. Among 481 heat pump models, 146 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 4.00 units of hot water energy for each unit used (its UEF). A UEF above 1 is possible because it moves heat from the air into the water. Its test simulated a day of high hot water use (its draw pattern). Of 237 heat pump models with the same draw pattern, 70 have a higher UEF and 141 a lower one. A UEF of 3.88 is the median for its type and draw pattern. When it reheats water in the test, the water gains 450% of the energy it uses.

There are 2 more basic models with the same test figures. Those basic models are sold with Midea as their brand names.

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