I thought I'd pass along some information about my Outdoor Wood Furnace. This past fall I bought an Aspen 175 made by Greenwood. My unit sits on a slab around 120 feet from the house (2500sqft). We have been warm and cozy all winter here in Maine, using only 5.5 cords of wood by the last week of February. Installation was fairly simple, the unit is an easy plug and play. Last time I checked the EPA website it was the cleanest OWB on the market.
After having burned wood in the basement for a few years I've been delighted with only having to fill this unit twice a day and no lugging wood into the basement anymore. I'd be interested in hearing from others that might have an Aspen just to compare notes. I was so pleased with this unit I decided to get into the business and would be more than happy to answer questions in email to those that might be interested. Please feel free to post here or drop me a line at xxxxxxxxxxxxxxxxxxxxxxx.com and I will be glad to get back to you.