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I found some products that seem to be what you described. They use a temperature sensitive paraffin foam to actuate an arm that can be adjusted for the desired temperature. Thanks for the tip.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Sun Mar 11th, 2012 at 07:56:23 PM EST
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