American HPTU-50N 1**

It holds 46 gallons in the test, 4 gallons less than its 50-gallon sold size. Starting full, it gives 66 gallons of hot water in its first hour of use. Its tank holds 46 gallons, so reheating adds 20 gallons during the first hour. Among 481 heat pump models, 330 have a higher first-hour rating. Among heat pump models, the median first-hour rating is 72 gallons.

All 3 of its model numbers are ENERGY STAR certified. In the test, it gives 3.45 units of hot water energy per unit it uses (its UEF). It moves heat from the air rather than making it, so its UEF passes 1. The daily hot water use in the test, called its draw pattern, was medium. Of 226 heat pump models with the same draw pattern, 185 have a higher UEF and 35 a lower one. On its draw pattern, the median heat pump UEF is 3.68. When it reheats water in the test, the water gains 407% of the energy it uses.

Its 3 model numbers are HPHE10250H045DVCTA-1**, HPHE10250H045DVDR 1**, and HPHE10250H045DVN 1**. There are 5 more basic models with the same test figures. Each of the 5 other brands lists one of them. For the full group, see the A. O. Smith HPTU-50N 1**.

It may qualify for 21 rebate programs. Another 7 programs may accept it if it meets their other terms.