The Autoformer get warm, yet not very hot. I don't know if they have a BTU rating, but my guess is they do not consume a lot of power, yet consumes more when you are using more power - such as running the A/C's and a lot of other stuff.
So if the transformer is putting out about 3,000 watts, it might itself consume about 30 watts in the process. 30 watts X 3.4 Btu's is about 90 Btu's per hour. Not a significant load.
I would not worry to much about burying it behind the refrigerator. Yet it might become difficult to wire. I guess I would extend all the Autoformer wires with some #8 (or is it #6 wire). Then you will establish a input red and black wire, along with input white. Then you will need to have a input red and black and white wire as well, that will connect to your power panel.
Then with blue wire connectors, the REALLY large ones, you can one at a time disconnect the red and black and white shore power wires from the main panel, and wire nut them to the new wires. Then extend the new output wires to the correct locations in the power panel.
Hopefully it will be easy to shove the autoformer into it's new home, without dislodging any of the wires.
Fairly straight forward process.
Fred.
