We had a new Weil-McLean boiler and hot water tank added five years ago as part of a re-modeling project. The gas boiler heats my hot water. The hot water is circulated to the faucets - this provides instant hot water. Starting last winter we have had four pinhole leaks in the hot water loop. Two of the holes are in the copper pipe that is only five years old. The circulator runs 24/7. I suspect there is a problem with this hot water loop. The water is supplied by the town - it is not from a homeowners well. There have not been any pinholes in the cold water pipes (most of the house has 55 year old copper pipes).
Could the circulater pump be operating too fast?
Could the circulater pump be operating too fast?