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[sphelps]

I'd run 1.5" for the return as well, even if you're reducing it to 1" at the tank. A 1" line that long will add a significant amount of head pressure from friction alone.

[jason604]

Oh man this will b awesome. My goal one day to build a house around a tank. If I were u I would go bigger. Since UR still in the design phase go for a huge tank it will be worth it and u won't ever be urged to upgrade. Make sure u make a tank journal n document each step of the way I would rly like to see how it all plays out. But yea I would also suggest a 1.5 on the return line as well. A return distant that far will have problems with a smaller piping