Pinholes in Hot Water Loop

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by 9000cs, Aug 17, 2005.

  1. 9000cs

    9000cs New Member

    Aug 17, 2005
    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?
  2. thezster

    thezster New Member

    Jul 18, 2005
    Retired young... day trade stocks - and to keep bu
    Fort Collins, Colorado
    Check the post down the page titled "Pinhole leaks"... it offers many suggestions as to this very problem..... Good Luck
  3. Sponsor

    Sponsor Paid Advertisement

  4. Gary Slusser

    Gary Slusser That's all folks!

    Aug 31, 2004
    Wherever I park the motorhome.
    Yes the velocity could be too high and resulting in erosion corrosion. Usually a few inches from fittings. Another cause is excessive flux or nonwater soluble flux or, not reaming the ends of pipe when using a tubing cutter. Other causes would be water quality related and could be high TDS and/or clorides content.

    If the bad spot was cut out, what did the leaking spot look like? If an elongated streak type groove, that's erosion corosion.

    Quality Water Associates
Similar Threads: Pinholes Water
Forum Title Date
Plumbing Forum, Professional & DIY Advice Pinholes in CU piping Sep 30, 2012
Plumbing Forum, Professional & DIY Advice pinholes in copper Jan 21, 2009
Plumbing Forum, Professional & DIY Advice Pinholes in copper vent pipe Nov 12, 2007
Plumbing Forum, Professional & DIY Advice Pinholes in copper pipes Dec 13, 2005
Plumbing Forum, Professional & DIY Advice pinholes Sep 20, 2005

Share This Page