Fordguy64,
You may want to look into why the evap coil is freezing up on your "stock" unit. Unless you are running it in a cold environment, the evap coil shouldn't freeze if you have a correct charge in the system and correct airflow.
Some of the efficiency gain of these hpwh's is directly tied to the relatively low input energy. As you know, a phase change system is most efficient when it runs nonstop. Keeping the capacity low prevents short cycling, but prolongs recovery time.
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