Dear Readers,
The supply/return pipes that come out of my furnace (I've learned not to call it a boiler) are threaded black pipe. Only after the circulators and expansion tank are they changed to copper. I assume this is to help bear the weight of these pieces of equipment on the line. Am I correct? Or is it that copper pipe cannot be within a certain distance to the furnace due to heat or possibility of galvanic action or some other reasons? Any ideas?
Thank you. Regards, Anthony