The instructions say not to overlap cords. I would go the store and get a cheap shoebox. cut a piece of the shoebox a little bigger than the probe. Affix the probe to the plastic, and then put the probe on the heat cord plastic side down. This should cause the temp that reaches the probe to be pretty close to what is in your tubs. Monitor the temps for a while and adjust as needed until desired temperature is reached. Good luck.

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