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update
Here's a pic of the feed and return from the veggie filter to the valve. I used some insulating sleeves originally designed to go over plug wires and slid them over both feed and return hardlines in series and tapped the joints with alum. tape. Under the 'socks' on the feed portion closest to the valve is where I settled on strapping the trace heater. It traces the hard SS feed line from the valve back almost to where the lines have surface contact with the heat exchanger. It appears that feed line will be plenty hot and since the return /purge hard line is in the same route it should consolidate the heat in the loop. I put a ball valve in the purge line so I can adjust the pressure so as not to starve the IP.
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