Heater bundles with local power switching

A heater system comprising:

• a heater bundle comprising:
• at least one heater assembly comprising a plurality of heater units, more than one of the heater units defining at least one independently controlled heating zone;
• a plurality of power conductors electrically connected to the independently controlled heating zones;
• means for determining at least one of heating conditions and heating requirements;
• an enclosure;
• at least one power switch disposed within the enclosure;
• a temperature regulation device that cools the enclosure;
• and
• at least one controller configured to provide a control signal to the at least one power switch such that the power switch modulates power to the independently controlled heating zone through the power conductors based on the at least one of heating conditions and heating requirements to provide a desired power output along a length of the at least one heater assembly,
• wherein the enclosure is sealed from an outside atmosphere.

A heater system comprising:

• a heater assembly comprising a plurality of heater units, more than one heater unit defining at least one independently controlled heating zone;
• a plurality of power conductors electrically connected to the heater units;
• an enclosure;
• at least one power switch disposed within the enclosure;
• a temperature regulation device that cools the enclosure;
• and
• at least one controller configured to provide a control signal to the at least one power switch such that the power switch modulates power to the independently controlled heating zone through the power conductors based on at least one of heating conditions and heating requirements to provide a desired power output along a length of the heater assembly,
• wherein the enclosure is sealed from an outside atmosphere.