Depending on room temp, I've had to run as high as 107 degrees indicated, to achieve 90 ish degrees in the tub.
That's with with 3 inch heat tape. Right now, sitting unboxed in the back of my Blazer is a new rack from RBI with 4 inch heat tape. I'll be interested to see if there's as big a difference between indicated and measured with the wider tape.
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