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Hot water coil or side arm?

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by mikeyny, Oct 30, 2009.

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  1. mikeyny

    mikeyny Feeling the Heat

    Joined:
    Nov 16, 2007
    Messages:
    294
    Loc:
    upstate ny
    I just re- plumbed my old tarm boiler after moving it inside to my basement. It used to be out in the detatched garage. I need to do some thing for domestic hot water. I used to use part of an old steel boiler with a coil in it as a side arm but it's just too shabby now. Once again I would like to do this on the low budget side. Can someone direct me to the home made "tube in tube" thread. I may try to build one. If I remember correctly there are several different ways to fabricate one. Are there any other ways to do it other than the traditional flat plate hx?
    Mike

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  2. kabbott

    kabbott Member

    Joined:
    Nov 19, 2007
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    384
    Loc:
    Hampstead,Maryland
  3. rowerwet

    rowerwet Minister of Fire

    Joined:
    Sep 2, 2008
    Messages:
    1,093
    Loc:
    Merrimack Valley, MA
    I just bought pipe at HD and sweated it all together, my inside pipe is 3/4, and the outer is 1 1/4, the inner pipe on mine is the DHW pipe. my shell heater is a preheater for a tankless hot water heater.
    I found I couldn't get the whole joint hot a once, I had to work around the joints with the torch and solder. I also bent the cold water (middle) pipe slightly so when the cold water made the inner pipe shrink it wouldn't put tension on the ends. I read somewhere on here about someone making their own and that the ends kept failing from thermal differences.
    here is a thread with pics.http://www.hearth.com/econtent/index.php/forums/viewthread/8168/P0/

    also http://ecorenovator.org/forum/solar-hot-water/636-diy-solar-hot-water-heat-exchanger.html
    shows someone making one.
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