Cast Iron Radiator Heat Exchangers

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by Norwegian Wood, Mar 5, 2013.

  1. Norwegian Wood

    Norwegian Wood
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    I'm halfway through building my 1000 gallon water storage tank.
    With the cost of copper being what it is, I was wondering if I could use two or three reconditioned thin wall cast iron radiators as heat exchangers for the EKO loop.
    I know copper has a way higher thermal conductivity than cast iron, about 6-7 times, but I will have a much larger surface area than coil tubes, and my intuition tells me this should work just fine, at a much lower cost.
    I've seen a couple posts where this is mentioned, but apparently nobody has tried it.
    Or has someone?
    Any thoughts from the forum?
    Thanks.
     
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  2. bmblank

    bmblank
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    Minister of Fire

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    I'd be concerned with air lock. Other than that they're probably fine. Maybe if they're mounted upside down airlock won't be an issue.
     
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  3. tom in maine

    tom in maine
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    They will corrode. There is also a risk of damaging your liner given the weight.
    Copper is a cheap date for a heat exchanger. Another option is to use a plate hx. You would need a second pump, but
    it might be a bit less expensive.
     
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  4. Norwegian Wood

    Norwegian Wood
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    Would powder coating stop them from corroding? The insides are built specifically to carry pressurized high temp water, and they last 100 years +.
    The outside I get, but I figured powder coating would buy me thirty years or so.
    I can distribute the weight using picnic cooler tops. They last forever.
     
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