From my experience 3/4 horsepower is the way to go. The Ice eaters when you buy them usually there is an attachment for a thermostat that you can but to use with it. There are also companys in the area that will monitor for you during the winter if you are not here to keep an eye on it.
Just so you know if a piece of ice or something gets lodged in one and the propeller breaks or the motor dies, you will end up with the exact problem you are trying to prevent.
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