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Can't help you on where I saw it. But to prevent freezing at point of use, the smaller tube carrying the hot water went beyond the last waterer pushing the cold water back to the cooler. Since I'm in the same climate I was thinking about having a freeze guard to turn the heater and pump when...

The design I saw used a 13 gal cooler with drain spout. The drain spout accommodates an off the shelf compression fitting. All lines were insulated with black foam wrapped in duct tape and terminated with nipple fixtures. What I liked was a small pump was located in the cooler and the line of...