Oh, and what "the right length" is, I don't know sorry - it comes down to how hot you want it - the longer the length for the same input voltage & amperage, the colder it is. So you will need someone to pop up and explain how long it should be. My cousin worked it out for me, he's knowledgeable in such things. If you don't get help, I can ask him. I think it's a pretty simple case of dividing the resistance of the wire in to the output of the 16v power pack, or something like that...
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