[Lynn Eades]

A quick look in an English manual Says that the system releases pressure at 4.5 psi to 5.5 psi, (it is adjustable with the screw, which should be resoldered afterwards) which means it's boiling point is raised to 228 degrees F.
Nothing shows, in the book, with regards which type of thermostat, but it does say that normal operating temp is between 180 to 190 degrees F.
Each water pump impellor is supposed to move 37.5 gallons of water per minute at 3000 rpm.
I dont know, but I suspect it should have the 180 degree thermostats.
Someone with a parts book should be able to clear this up.

UC F1 states on page P-10, at the bottom, They should start to open at 160, and be fully open at 180 degrees F. so ask the supplier which is correct.
I would always use a wax type thermostat. They usually fail in the open position, and are physically more durable.
A bellows type usually fails in the closed position, and are more fagile. The dangers of chaffing referred to in the text of UC F1 are talking about a bellows type thermostat