Like Vermin says, nichrome, and contrary to what he says an electrical dunce like me can (has) done it. I simply sourced a suitable gauge of wire, and at a suitable length to go with the power supply I use (12 volts). In most I make it a semi permenant fixture, by sheathing the nichrome, and attaching it with electrical tape, in a neat fashion. Wires leading from the nichrome to the other heaters all finish at a plug, and this gets fed to 12 volts. The only trick is the right length/gauge to allow a warming, and alo the fact that you can't solder Nichrome, bummer.
Gary
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