That is one of old ones. Mats are wired together per watt usage And each set had its own thermostat. Flex watt was wired together and hooked up to a rheostat. One for hot spot and for ambient. But I am trying out a rack system with back heat. Of I like it then I will buy it and the one just like it for the other 5. But the plastic shelves I have been using for 8 months with no problems.

Sent from my LGLS996 using Tapatalk