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Garn Owners - please give me some advice

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by sjfrench, Nov 8, 2013.

  1. maple1

    maple1 Minister of Fire

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    That won't work very good when just heating DHW from storage (or the Garn between firings) in the summer though will it?

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  2. sjfrench

    sjfrench New Member

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    Missouri
    That is very interesting idea! I've got a plumber who is going to do the DHW hook up for me. Considering that I'm having all of my loops on a continuous loop, that should be a real possiblity. So two questions:
    1. Where do if find an example of the plate you used?
    2. I'd still like more info on that Garn sweater you mentioned in an earlier post. How do I get pricing and ordering info?
  3. heaterman

    heaterman Minister of Fire

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    The HX we used is just a standard flat plate type heat exchanger 5" x12" with 10 plates or sections. It has 1" pipe threads on all 4 corners, one side being for the domestic and one side being for boiler water.
    Use a greater number of plates for less flow resistance on the boiler side of things and more heat transfer if you anticipate higer GPM draws from the water heater.

    A kit shipped to your location would be $1,355 for a model 2000. It consists of ridgid fiberglass board for the front and back and fiberglass blanket for the sides. The front piece is pre cut to fit around the door/air collar and the draft motor and is covered with a heavy aluminum scrim to resist punctures a little better than the reinforced poly coating used on the sides and back.
    The back piece is also precut for the openings back there. It comes with both aluminum seam tape for the front and a large roll of reinforced poly tape for the back and sides. Stick on "nails" are used to hold the blanket tight to the bottom of the Garn on the sides.
    It is made to offer decent insulating qualities and be very easy to install. A couple guys can usually do it in less than an hour.
    It also allows 360* access around the Garn for ease of service and future maintenance.
  4. sjfrench

    sjfrench New Member

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    Missouri
    How do I place an order, and I'd like to ask some details on the R-value of the product. Do I contact Fabrication Solutions?
  5. heaterman

    heaterman Minister of Fire

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    Dial BR-549.....


    kidding..

    You would simply give me the word and I'll get in touch with you personally to hash out the details.

    The R-values are in the 15 range for the whole kit. Not as high as you can achieve building an enclosure from scratch but the kits have proven adequate to say the least. The blanket fiberglass used in the kit is about 4 times the density of typical stock used to insulate a house. They are pretty air tight once the seams are sealed.
  6. woodsmaster

    woodsmaster Minister of Fire

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    Why would he be disappointed ? I wouldn't say it is the best option but why the disappointment ? I have a side arm and heat my water all summer. I can usually go 4 to 7 days between fires with 1000 gallon storage depending on demand.
  7. maple1

    maple1 Minister of Fire

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    I think I explained my reasons in post #24 - just one point of view.

    Do you pump the DHW side of your exhanger? Do you measure all the temps in & out of it? Just curious on your exact setup & what you are seeing for approach temps.
  8. woodsmaster

    woodsmaster Minister of Fire

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    I didn't read the other post. I agree that it does take longer to recover when temps drop below 150. Mine is also convection. If you pump the domestic side it will increase transfer and recovery time a lot so I've heard. My ideal setup would be a flat plate on demand type. I don't use as much hot water as I did. Got rid of the wife and my step daughter is only here once in a while so the sidearm works great for me, 2 kids and girl friend. New girl friend don't stay in the shower for a half hour like the wife did. lol

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