A soldering iron.
I don't know if they work on a DC current but if they do then you could butcher an old one up replace the tip with a heat die shaped one, and give it current through a circuit with capsitors (to regulate) and resistors (to alter the current).
They CAN get up to VERY hot temperatures and run for hours (well at least the ones I have do... I'm allways leaving them on.)
Worth looking into?
~ Boli
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