Did you put a thermostat on your heater cores so the fans won’t come on until the water is above 110 degrees
The simple answer is yes. I didn't add it, it came as part of the heater. It's just some sort of sensor with two spades and it is tie wrapped to the inlet tube of the heater. I can't find anything like it or get any useful numbers off of the unit itself. Since the heater uses small muffin fans this can handle the current.
Any suggestions on where to find a replacement. One of my heaters didn't have one and I would like to add it.