Many years ago I added a extra bed room with bathroom. This extension was plumed with copper. The existing house was galvanized. To connect the two together the building inspector told me to use a 6" bronze pipe between the copper and galvanized connection. 15 years later the galvanized connector is showing signs of corrosion ( hot water side ) the cold water side is still OK. I was looking to eventually re-plum with PEX but because there is indirect sunlight under the house apparently PEX may not work without completely covering the plastic pipe.
So the question I want to know is if I replace the bronze pipe with a small PVC pipe. This is on the hot water side and will not be potable just for showers. Will that be a long term problem. The copper is still grounded via the cold water side, will I need to run a jumper to ground the hot water copper side against electrolysis.