Hey guys thanks for all the help.
Just for more clarification. There are three heater units all with their own thermostat wired to one breaker.
In the picture the white and black on the right are dead and go to the heater.
The wires on the left: two go to the next heater on the floor and are dead. And the other two most likely come from the first heater and are hot.
(breaker is off)
Here is the back of the thermostat.