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Hello friends, recently I posted about my tankless system and onix tubing causing severe rusting of my black pipe and causing issues with my system. If I wanted to keep my onix and use a heat exchanger to isolate that tubing from the regular side, how do you go about it? I assume the onix side would need inhibitor, stainless pump and possibly an expansion tank? How does it get wired to a taco controller if the secondary pump on the first side has to run in addition to the onix side? Thanks