State HPTA-80 2**

It holds 81 gallons in the test, 1 gallon more than its 80-gallon sold size. Starting full, it gives 95 gallons of hot water in its first hour of use. Its tank holds 81 gallons, so reheating adds 14 gallons during the first hour. Among 481 heat pump models, 17 have a higher first-hour rating. Among heat pump models, the median first-hour rating is 72 gallons.

It has 2 model numbers that are ENERGY STAR certified. In the test, it gives 3.88 units of hot water energy per unit it uses (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, 112 have a higher UEF. Its UEF is the median for its type and draw pattern. Its recovery efficiency is 428%, because it takes heat from the air as it reheats water.

Its 2 model numbers are CSHP-80 2** and HPAX-80-DHPT 2**. All of its test figures are shared by 4 other basic models. They are listed under 4 other brands, one each. For the full group, see the A. O. Smith HPTA-80 2** page.

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