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Steve - regarding the talk of building a shed for wood storage or to house the boiler - I carefully covered my wood with Wal-mart tarps the first winter until a friend convinced me I was wasting my time. Those furnaces will burn wet, snow covered wood with no trouble. Now I just thump the end of each chunk on the ground to dislodge the snow and pitch it in the firebox. It's bound to lower the efficiency of the system, but I can't tell it in the house. The Hardy folks recommend no shed over the furnace. Mine looks as good as the day I bought it. If it's raining and I don't want to get wet, I just wait a while for it to quit. Regarding the installation of the wire in the pipe along with the hot tubing - I worried about that myself, but the dealer assured me that there was nothing to worry about. The water temperature is probably not much hotter than the inside of my attic on a hot day, and the wire in the attic stands it. My insurance company was happy that I moved my heat source from the basement to the outside. Their only concern was that I locate it at least ten feet from the house. The rates dropped slightly. I don't think I'd inject the foam into the 4" pipe in case I ever needed to pull the lines for some unfortunate reason. Besides, the insulation sleeves only cost $53 in my setup. The foam might be higher than that. My water temperature drops around ten degrees on the trip from the boiler to the house. I added two, three foot sections of stack on our Hardy to get the smoke a little higher. One of my grandsons has a touch of asthma, and my wife worried that the smoke would bother him. I had trouble with creosote buildup in the top section (probably from burning wet, snow covered wood) and removed the top section. No more trouble. The higher you get from the firebox, the cooler the pipe temperature, and more buildup. I got the stainless steel stack sections from Hardy for about $20 each. My total cost, three years ago, was $4200. I poured my own slab, dug the trench, and installed the 4 inch PVC. The dealer supplied all the remaining material and the installation. Sorry again for rambling.
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