American HPTV-50 2**

It holds 46 gallons in the test, 4 gallons less than its 50-gallon sold size. Over one hour from a full tank, it gave 52 gallons in the test (its first-hour rating). Reheating lets it give 6 gallons beyond the 46 gallons in its tank. Among 481 heat pump models, 439 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 3.00 units of hot water energy for each unit used (its UEF). A UEF above 1 is possible because it moves heat from the air into the water. The daily hot water use in the test, called its draw pattern, was medium. Of 226 heat pump models with the same draw pattern, 208 have a higher UEF and 5 a lower one. For its type and draw pattern, the UEF runs from 2.59 to 4.23. While it reheats, the water gains 457% of the energy it uses (its recovery efficiency).

Its test figures match those of 4 other basic models. Each of them is listed under a different brand. You can find the whole group on the page for the A. O. Smith HPTV-50 2**.

It may qualify for 19 rebate programs. It may qualify for 5 more if it meets terms its figures do not show.