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...usually mean old, thin walled, corroded copper hot water lines that need to be replaced.
*Not that I've tried this myself, but someone once told me it worked for them. Take a sharpened pencil and break the point off in the pinhole, then wrap with duct tape. Seems like it could work at least for a temp fix.
*There are some areas where the water causes pinholes in copper. Do a search over at http://www.plbg.com, they have lots of info on this.-- J.S.
*Mike - more info for you:http://www.wssc.dst.md.us/cfdocs/copperpipe/pinholescroll.cfmI had this problem in a previous home and replaced/spliced in CPVC where I could. My own opinion is that this is a synergistic problem i.e. it doesn't have a particular cause but several conditions/situations have gotten together and do a darn good job of promoting/causing these pinhole leaks. For example: grounding the electrical service on the plumbing line, dissimilar metals in the water supply system, thin-wall copper vice thick, hard water, less than optimum water ph, and on and on.
*coppor borers, a rare but distructive insect.Rich Beckman
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