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if my pond frezzes we're all in troulble. lol, i don't remember when the last time we had temp under 35 degrees for more the 10 hours( and I'm old) I was thinking about my tipalia mainly. I ran power to both end of my ponds. I'm a Mechanical Contractor so a temp stat that would work in a cooling tower would fit just right in this applacation. Now look what happen an other dang project.