John is this circuit something that should be installed in addition to the recall device that is installed on dometic refrigerators that are supposed to shut them down when the piping gets too hot?

The answer I would give to the Dometic recall is this:


The Dometic recall is retroactive in the sense that it only works after there is a failure.  The folks from Dometic stated that the recall is to protect the electrical wiring, gee who needs wiring if the fridge does not work?  If you note the Dometic recall is a snap switch that is mounted outside the boiler housing.  Therefore it reads ambient conditions better than the boiler conditions because there is insulation between the boiler process pipe and the sheet metal housing it is attached to.