Patent ID: 8217316

Claim:
A heating system comprising: a cabinet having at least two walls defining an interior heating chamber, wherein the at least two walls are respectively associated with at least two heating zones within the interior heating chamber; at least two sensors attached to an surface of the walls and each positioned to monitor the temperature in different of the at least two heating zones; at least two heating pad subassemblies attached to the exterior surface of the walls and positioned to generate heat in different of the at least two heating zones, each of the heating pad subassemblies surrounding a corresponding sensor and including: a pad having an attachment face coupled to the exterior surface of the walls; and a heating element coupled to the pad; and a controller in electrical communication with the heating elements and the sensors, the controller configured to independently monitor the temperature from each of the sensors and further configured to independently control each of the heating elements; wherein the heating pad subassemblies are positioned on the exterior side of the walls and the heating system compensates for loading variations in the interior heating chamber affecting heat transfer across the heating zones, within the interior heating chamber.