My Mantra has no thermostat, and runs about 120 degrees. There is some type of valve at the beginning of the supply line coming from the pump to the engine. I'm guessing it's a pressure reducer, but I'm still new to all of this. I've read until I'm cross eyed all of the arguments about how to run your water lines. It seems like it'd be better on the engine to run at 180 or so. I've looked at the thermostat kit on Rex.
Should I put a thermostat in it? If so, what kit do you like?