I have been researching outdoor wood furnaces. From what I can see, there are 2 basic types, pressurized and atmospheric (non pressurized). A pressurized system would hook up directly to my FHW system to make a closed system. An atmospheric system would transfer heat via a Flat Plate, water to water heat exchanger. This would keep the 2 systems separate, hence avoid any contamination/corrosion issues associated with atmospheric systems. My question is, How well do the exchangers work? I realize they can't be as effective as a direct link to my FHW system, but are they close?
Also any opinions on outdoor wood furnace brands would be a great help.
Thanks,