I'm considering a wood furnace (I have central LP heating, and 2 wood inserts but I don't like the mess or lack of central heat using the inserts), but not sure what type is best. I know some furnaces have water jackets (central boiler, Hardy, etc) and a few do not (Fire Chief, etc), but I don't know the advantages one has over the other. Either type would have to be set outside or possibly in the garage as I don't have space in the house. It would seem the waterless furnace would have fewer maintenance problems than the water boiler type as there are no water-related issues to contend with--leaking tanks or radiator-type apparatus needed (I assume) in the existing LP furnace, cleaning, etc. Not sure about heating efficiencies, installation issues, or wood consumption. One question I don't see discussed is how much electricity is typically used in operating blowers/pumps that I assume is necessary to circulate the heat and/or hot water, particularly with the water boiler type which I assume requires both a blower and a pump? I also don't know if it makes sense to have either furnace in SW MO where the winter temps fluctuate, might be in the single digits a few days/nights and in the 30s-50s the next few days. Temps get below 0 maybe one season out of 4 or 5. I use about 800 gallons of propane a year, but keep the house colder than I would like. I live in the country with an abundance of free wood.