Thanks for the review Old300D
I'm going to run insulated HIH for supply AND return to an insulated wvo tank. Even the wvo rubber lines between the filter and the IP will be insulated. It is a little over the top, but I want the system to work at any temperature (and besides I tend to do everything a little over the top

).
My wvo filter is the high point in the wvo supply and return line system, and it has a bleeder screw and primer pump. I hope to be able to purge air bubbles there if necessary...
Other thoughts?
Chuck