State FPTU-50 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. Among 481 heat pump models, 330 have a higher first-hour rating. The median heat pump model gives 72 gallons in its first hour.

The single model number sold under it is ENERGY STAR certified. For each unit of energy it uses, 3.35 units end up in the hot water (its UEF). Pulling heat from the air lets its UEF pass 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, 193 have a higher UEF. For its type and draw pattern, the median UEF is 3.68. When it reheats water in the test, the water gains 407% of the energy it uses.

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 FPTU-50 1** page.

In 17 states, 17 rebate programs may accept it. Another 5 rebate programs may accept it if it meets their other terms.