State HPTU-50N 1**

It holds 46 gallons in the test, 4 gallons less than its 50-gallon sold size. It delivers 66 gallons of hot water in the test's first hour. Reheating lets it give 20 gallons beyond the 46 gallons in its tank. Of 481 heat pump models, 330 give more hot water in the first hour. The median heat pump model gives 72 gallons in its first hour.

Of its 3 model numbers, 2 are ENERGY STAR certified. In the test, it gives 3.45 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. In the test, daily hot water use was set to medium (its draw pattern). Of 226 heat pump models with the same draw pattern, 185 have a higher UEF. On its draw pattern, the median heat pump UEF is 3.68. While it reheats, the water gains 407% of the energy it uses (its recovery efficiency).

It is the basic model for HPX-50-DHPTCTA 1**, HPX-50-DHPTDR 1**, and HPX-50-DHPTNE 1**. Its test figures match those of 5 other basic models. They are listed under 5 other brands, one each. You can find the whole group on the page for the A. O. Smith HPTU-50N 1**.

It may qualify for 21 rebate programs in 20 states. It may qualify for 7 more if it meets terms its figures do not show.