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Thread: Type of soldering for installing a zone valve

  1. #1
    DIY Junior Member Arepa's Avatar
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    Oct 2011
    New York

    Question Type of soldering for installing a zone valve

    I purchased some honeywell zone valves and in there I found this notation:

    "Sweat copper models, do not use silver solder because of the high melting temperatures required" Can someone tell me exactly what "silver solder" is? Is that a brand? What type of solder do I need to use in order not to damage this unit... I was surprised on the luck of information in the directions indicating what type of soldering I should be using.

    I thank you in advance for your reply,


  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Sep 2004
    New England


    Potable water systems used to use a lead based solder...all new solder designed for potable water systems is silver based (i.e., silver solder) and not lead. So, since a heating system's water isn't used for drinking purposes, a lead based solder is okay, and, because it melts at a lower point than silver solder, is the preferred material when temperature is an issue. Now, where to find it is the harder issue. Maybe a good plumbing supply store.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    In the Trades Jerome2877's Avatar
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    Aug 2009


    I believe their referring to brazing rod, sometimes called silver solder. The 95/5 lead free should be fine.
    Last edited by Terry; 11-03-2011 at 11:21 AM.

  4. #4
    DIY Junior Member electrichillbilly's Avatar
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    Nov 2011
    turtlepoint, pa


    i believe the instruction refer to remove the valve from the housing to eliminate any damage to ther valve during soldering. by the way, if you use mapp gas it is much hotter than propane which makes soldering very quick and easy

  5. #5
    Forum Admin, Expert Plumber Terry's Avatar
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    Aug 2004
    Bothell, Washington
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    Silver soldering is brazing.

    Standard soldering is done with tin. Most of the time it's in the 95% tin and a few other metals thrown.

    Since this is for heating, you might be able to get by with 50/50 which is half lead and half tin.
    I haven't carried any 50/50 in thirty years.

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