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Ok, here's what I found. "Easy Heat" #AHB-124. Only thing is I called 5 Lowe's stores in Houston area and none carry the product. Amazon.com has it for $9.00 less, but charges $7.50 for shipping.
Foremost Insurance has an article on installing heat tape which confirms what all you have said, i.e., not crossing it over itself, etc. It comes on at 38 degrees and shuts off at 45 degrees. 24' of the stuff ought to be just right for a 25' hose. EBAY wants $23 + S&H which is probably the best price I found.
Around 1950, it got down to 10 degrees and stayed there for 5 days in Freeport were I grew up. I don't remember the exact year, but do remember the cold. About 100 miles north of Houston is where I would be protecting the water supply.
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