Heres how it works, the UTH plugs into the thermostat and then the thermostat plugs into the wall. The thermostat uses a temperature probe to read what the temperature of the UTH is then adjust the amount of power is going to the UTH.
Here are some graphical examples:
UTH on one of my cages:
UTH's plugged into my thermostat:
This picture shows the white UTH power cord and the black thermostat probe cord
Thermostat probe
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