Friedrich PROH40 T2 FD400-30

It holds 36 gallons in the test, 4 gallons less than its 40-gallon sold size. It delivers 60 gallons of hot water in the test's first hour. Its tank holds 36 gallons, so reheating adds 24 gallons during the first hour. Of 481 heat pump models, 371 give more hot water in the first hour. Among heat pump models, the median first-hour rating is 72 gallons.

Its single model number, PROH40 T2 FD400-30, is ENERGY STAR certified. For each unit of energy it uses, 3.83 units end up in the hot water (its UEF). It moves heat from the air rather than making it, so its UEF passes 1. In the test, daily hot water use was set to medium (its draw pattern). Among 226 heat pump models on its draw pattern, 23 have a higher UEF. On its draw pattern, the median heat pump UEF is 3.68. Its recovery efficiency is 434%, because it takes heat from the air as it reheats water.

All of its test figures are shared by 28 other basic models. Of those, one or more are under the Rheem, Richmond, and Ruud brands. You can find the whole group on the page for the Rheem PROPH40 T2 RH375-SO.

In 20 states, 21 rebate programs may accept it. Another 7 programs may accept it if it meets their other terms.