garn

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    Garn Flue Temp Shutting Down Prematurely

    Hello folks, I have a Garn 2000 heater that heats a radiant slab in a horticultural greenhouse. The unit is 12 years old, but ive only owned it for 2. Recently the flew temperature sensor has been shutting the unit down prematurely. I have witnessed it shutting down as high as 309° down to 200...
  2. R

    Oxygen diffusion in closed and open hydronic systems

    Hi Folks, I am considering getting a wood fired boiler to help with root zone heating and other hydronic heating needs. I have been reading up on units like Econoburn and Garn and trying to best deal with minimizing oxygen corrosion in theses systems. The basic problem is that I can use pex...
  3. surefire

    Garn Owners: What are your Annual Costs?

    What are your annual maintenance costs to running your GARN? Chemicals, lab sample shipping, parts, etc. Not including firewood and electricity, of course :) Is anyone still using anode rods, and if so, how often are you having to replace them? Thanks!
  4. surefire

    Heatmaster G200 vs Garn

    I discovered the GARN four years ago and have been excitedly planning and prepping the installation ever since. But yesterday I discovered the Heatmaster G200, thanks to "3fordasho," "hondaracer2oo4" and "Karl_northwind," on the post "Heatmaster G200 + 550 gallons storage." I like the Garn for...
  5. T

    New Install design - getting started with TACO HSS

    My first post here! I am starting my design for a new wood boiler (GARN 1500). I've playing with the TACO HSS software, and thought I was doing great. For example, as I changed the load or distance between house and boiler, I could see the pipe size increase from 1" to 1.25", and I was happy...
  6. S

    Yikes...lost my water pressure/heat to slab...air in the lines?

    The questions: Do I need to re-pressurize the expansion tank to clear out the air? Should I close all lines in the slab and run one at a time to clear the air? The back story: I noticed that the small blue (expansion?) tank read 0 psi...so I hooked up a hose and turned on the water to...
  7. S

    flue temps

    With the GARN 2000 I've been advised to keep the flue temp between 300 and 400 degrees. What's happening if it's higher or lower? Does lower mean either I'm burning wood with too much moisture, thus increasing the chance of Creosote, or the fire is too small? Can the temps get much higher? I'm...
  8. S

    Calculating btu's- how does this pertain to boiler ratings.

    My understanding is that it takes 8.33 btus to raise 1 gal of water 1 degree f. If so, an 1800 gallon tank needs (at least) 8.33 x 1800 = 15,000 btu's? If the mfg. states 1 firing will raise the water temp approx. 30 degrees (with no load)...then 1 firing is 450,000 btu's. This unit is rated...
  9. S

    3 way mixing valve questions

    I'm using a Caleffi 5231 3 way mixing valve and having trouble understanding how these things work. This style has the numbered knob on top...e.g. 1 is coolest, 7 is hottest. It was set by plumber upon install at #3 on the dial (supposedly 117 degrees)...I've moved it to 4.5 (125 degrees) The...
  10. S

    Just fired a Garn 2000

    and I see the occasional wood spark and the smell of wood smoke coming into the room through the air fins on the blower. I'm surprised it doesn't suck air from the room rather than blow air into it. Otherwise it seems to be running fine...though the blower sounds like you're living next to a jet...
  11. S

    Just fired a Garn 2000

    and I see the occasional wood spark and the smell of wood smoke coming into the room through the air fins on the blower. I'm surprised it doesn't suck air from the room rather than blow air into it. Otherwise it seems to be running fine...though the blower sounds like you're living next to a jet...
  12. S

    When to use Heat Exchanger

    Our prior stove had one pump to the heat exchanger and one from the exchanger to the slab. Using an open system, such as the Garn, is there a benefit to going direct? The Garn sits 4' higher than the slab I hope to hook up additional buildings if there is available heat in the future Regards...
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