I have a 5'x5'x5' oven that I built and have been trying to figure out what I want to use to heat it. It has a 3" frame that will house the insulation the interior walls are a 18 guage steel. I have been trying to figure out what to use to heat this monster. I tried using standard heating elements from a kitchen oven (4 to be exact) it only managed to pull the oven up to 140*. However this is with no insulation. I plan to use foil backed insulation and then wire the elements in. Any suggestions would be great.
