American HPTU-66N 1**

It holds 67 gallons in the test, 1 gallon more than its 66-gallon sold size. Over one hour from a full tank, it gave 79 gallons in the test (its first-hour rating). That is 12 gallons more than its tank holds, since it reheats during the hour. Among 481 heat pump models, 165 have a higher first-hour rating. The median heat pump model gives 72 gallons in the first hour of the test.

It has 3 model numbers that are ENERGY STAR certified. For each unit of energy it uses, 3.45 units end up in the hot water (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, 199 have a higher UEF. A UEF of 3.88 is the median for its type and draw pattern. While it reheats, the water gains 265% of the energy it uses (its recovery efficiency).

It is the basic model for HPHE10266H045DVCTA-1**, HPHE10266H045DVDR 1**, and HPHE10266H045DVN 1**. All of its test figures are shared by 5 other basic models. They are listed under 5 other brands, one each. For the full group, see the A. O. Smith HPTU-66N 1** page.

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