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Old 09-08-2012, 01:17 PM
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Join Date: Jan 2011
Location: Cody, WY
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Default RE: Large volume hotbox

Extruded polystyrene insulation foam isn't very stable about 165*F.

I would frame the box just like you would a wall.  I would line the interior with fiber cement tile underlayment.  You should be able to get it from Home Depot or Lowes.  You can insulate it with regular house insulation.

I would heat it with a 120 volt baseboard heating unit.  You can get 30" ones for around $20.  You will will have to jump/disable the heat protection circuit breaker or put a breaker with a higher temp rating into the unit.  If you want to get to 180*F then you want to use at least a 200*F breaker.

You'll want to install a fan to the inside that can circulate the air to eliminate hot spots.  You will need a fan that uses bearings that can handle the higher temps.

You can control the heating unit with a Ranco controller.  These wire up very easily and already contain the relay and temp sensor.  There are other heat controllers out there on ebay but you will need to wire them up to a relay to turn the heating element on and off.