Thats impressive what is stated about the Willis. Still Apples to Apples, once the Pro-Heat did work I have been more than happy with it and its savings it gives me, does what I need it to do even if it only produces 4,000 watts.
Keeps the sleeper cool in the heat of the summer, and warm in the cold of the winter, as for three cyl. vs two one cannot kill the Kabota engine as for noise the humm is comforting when another truck or Refeer is next to you.
I also have found out that there is new key pad that will run the heat and AC with Shore Power.
