The next two pictures below show the run in the attic at both the point where it penetrates the roof decking and where it comes up from the garage. You can also just barely see the `bell' wire hanging down from the upper pipe in the first picture. This is temperature sensor line that goes to the Steca controller. I plan on running this through the rubber gasket on the Oatey flashing with the return pipe, then running it under the outside pipe insulation.
The above photo shows, from top to bottom, the 3/4" EMT conduit (future PV?), return and delivery lines. That 10" galvanized stack vents our gas furnace and hot water heater. This attic is very low, full of itchy fiberglass and has knob and tube electrical lines that make an electric fence that I'm forced to limbo around. I can't wait to be done up here!