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Post in 'The Boiler Room - Wood Boilers and Furnaces' started by bmblank, Jan 22, 2013.

  1. Fred61

    Fred61 Minister of Fire

    Nov 26, 2008
    Southeastern Vt.
    You're right. But what concerns me is that the copper coils would be happier with a PH sightly lower than 8 - 10.

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  2. bmblank

    bmblank Minister of Fire

    Jan 17, 2013
    Well, my brothers is nearly identical and gone for 10 years so far. Should probably check it out, but there's Ben no problems. Mine's easy enough to drain and get into, I'll be keeping an eye on it.
  3. jebatty

    jebatty Minister of Fire

    Jan 1, 2008
    Northern MN
    This isn't a significant issue. Copper is adversely affected with pH below 7.0 (acidic). Copper dissolves in acidic solutions, and blue/green stain is evidence of this. Copper pitting can occur in high pH water with low dissolved inorganic carbon and in the presence of chloride. While ideal pH for copper is 7-8, the ideal pH for steel is in the 8-9 level (and can be higher) to prevent steel corrosion, which is the major problem with steel boiler systems. 8.8 to 9.2 pH might be the best compromise for both. Water treatments are available for both steel and copper which address these problems, thus my statement of 8-10 pH. Also, the relatively low temperature of water in a home boiler system (much less than 400F) results in minimal impacts on copper. For more info than you might want to know, take a look at this article.


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