ACIQ ACIQ-80G-HP-WH

It holds 74 gallons in the test, 6 gallons less than its 80-gallon sold size. Starting full, it gives 91 gallons of hot water in its first hour of use. That is 17 gallons more than its tank holds, since it reheats during the hour. Among 481 heat pump models, 43 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). It moves heat from the air rather than making it, so its UEF passes 1. 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. 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 16 more basic models with the same test figures. Besides this brand, 15 brands list one or more of them. For the full group, see the 1HVAC ACIQ-80G-HP-WH page.

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