Novair US3-RSJ-15/250RDVN3-L3

Starting full, it gives 80 gallons of hot water in its first hour of use. Its tank holds 60 gallons, so reheating adds 20 gallons during the first hour. Of 481 heat pump models, 146 give more hot water in the first hour. Among heat pump models, the median first-hour rating is 72 gallons.

It is ENERGY STAR certified under its single model number. For each unit of energy it uses, 3.90 units end up in the hot water (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 high. Among 237 heat pump models on its draw pattern, 97 have a higher UEF. For its type and draw pattern, the UEF runs from 2.85 to 4.95. Its recovery efficiency is 450%, because it takes heat from the air as it reheats water.

All of its test figures are shared by 13 other basic models. Between them, those basic models carry 9 other brand names. For the full group, see the Rinnai REHP65.

It may qualify for 19 rebate programs in 19 states. Another 8 rebate programs may accept it if it meets their other terms.