tankless coil leak

Discussion in 'HVAC Heating & Cooling' started by pete c, Feb 16, 2008.

  1. pete c

    pete c Member

    Dec 14, 2007
    I installed a tempering valve last week. In doing so, I stressed the output fitting on the tankless coil and it started leaking boiler water.

    I had my yearly boiler service done a few days later. He said have it welded. The guy at the plumbing supply company said, yeah, that might work....for awhile. Replace the tankless coil.

    So, I ordered a new coil. It came in yesterday. When I pulled the old coil, it looked to be in very good condition, but, the weld or braze just looks like it let go. I thought to myself, self, you could fix that. Then I figured, screw it, I got a new one here. Let's be done with it.

    So, I start taking the fittings off the old one, but the fitting that holds theremometer absolutely refuses to come out.

    So.... I get to thinking again (I hate it when that happens). I figure, well, I could patch this old one up for now and throw it in and see what happens. If it fails, oh well, I got a new one.

    So last night I clean everything up as best I can and I used a good sized wad of clear silicone along the inside of the leaky fitting. This stuff is rated for 300 degrees. Since boiler water can't get past 212 degrees, it should work. On the outside I used jb weld and let it sit overnight.

    I figure the silicone will be up to keeping any leaks at bay and the jb will provide the strength to keep the fitting from moving around.

    I am gonna throw this thing together and cross my fingers. What do you folks think. That dang coil was over 300 bucks. I was real close to buying an indirect, but, when I found out they wanted 75 bucks just for a blockoff plate, I said screw it.

    If it holds for a few days, I may just return the new one. I will probably have to eat a 10% restock fee, but, it just might be worth it.

    One other thing. This has got to be about the bazillionth time I've found myself saying, damn, I need to get me a welder. You can find a decent one on fleabay pretty cheap. I think I'm gonna do it soon.
    Last edited: Feb 16, 2008
  2. Master Plumber Mark

    Master Plumber Mark Master Plumber

    Feb 6, 2005
    Sensitivity trainer.. plumber of mens souls
    indianapolis indiana - land of the free, home of
    the silicone wont work for long

    dont take back that coil.....

    if tha silicone works on that coil it will be
    a miracle....

    learn to braze
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  4. BigLou

    BigLou New Member

    Nov 7, 2007
    So why are we still debating about fixing an old, poorly performing inefficient way of heating water ? I just don't get it your going to have more hot water using less oil and a cooler basement in summer when the unit can shut off for hours at a time. You remind me of my father in law how won't put one in. All the BTU's that can't go in to heating up the few gallons of water in the boiler go right up the chimney

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