How are you heating? If youre using a tank + Under tank heater, the herpstat probe should be on the outside of the tank, between the glass and the UTH, in the center.
If you are using flexwatt, the herpstat probe can be foil taped anywhere on the flexwatt, preferably close to the middle.
Your thermometer probes are the ones that will be hot glued inside the tank or tub.
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