I was slightly confused about the wattage rating being its transfer capability and not its power draw, however my point remains that all your theories are assuming that the peltier is a perfect insulator (for the heat not transfered thermoelectrically). Do you believe that you will fry your cpu if you simply unplug your peltier? essentially making it a 0-watt peltier. No. The excess heat not transfered thermoelectrically is transfered via conduction, like a heatsink.
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