Are wood gasification boilers too expensive, or are they actually free? Or to phrase it another way, do 10 -15 thousand dollar gasification installations actualy make practical, economic sense? This might border on heresy, but none-the-less, lets explore. It might turn out that gasification boilers are not so expensive at all. Given their greater efficiency, maybe they turn out to be free after a few years. Further, 'expensive' is a relative term -- expensive compared to what? Either way -- expensive or free -- it would be interesting to hear from peole who know about this stuff -- dealers, plumbers, deadicated science-experimenters, data collectors -- do gasifiers actually 'pencil out?' Where do they make sense? And where are they clearly pretty extravagant? Dealers must know right off if the expense of a gasifier makes sense in any given circumstance. All you really need to know is the person's exisiting cost of heat, and the price of firewood. That, plus the Interest Rate. In the last analysis, what else is there? And lately I've begun to wonder about the interest rate. If gasifiers actaully save significant amounts of money, why don't dealers offer to finance the boilers, with payback coming from the fuel savings. If the savings are actually there, wouldn't that be a great way to sell lots of units. Maybe add some insurance to proctect all concerned. What do people consider a reasonable payback period, and what kinds of input numbers do you have to put in to achieve that magic number? If it were possible to go out an borrow the money, and pay it back via fuel savings over a reasonable period.... I'd be sorely tempted. As it stands, lets say I have a yearly fuel oil expense of $3200. Quality firewood around here costs 270/chord. What would be a realistic interest rate these days? How many years might it take to cover the cost of an hypothetical 12-15 thousand dollar installation? Could it really be done with no cash outlay on my part - i.e. barrow the whole thing and pay it back with the savings? Seems too good to be true. What do you think?