I just finished project today. My fuel oil furnace gave up the ghost three years ago . We have a fireplace with an insert stove with blowers . Also we have the heat pump ,,,,,,and an old house that only has insulation in the attic .
Friend of mine gave me a fine wood burner with a blower system on it . I cut the bottom off my old fuel oil tank , and hinged a door in each end . The trash heap at work had a plate of steel with 1 1/2 inch angleiron welded to it . It turned out that the cut off oil tank fit right on the plate . The stove sits on the plate , and the oil tank is nothing more than a small house to keep most of the elements off the stove and blower . Chimney pipe on one side and the blower pushes hot air through an insulated 6 inch pipe into my crawl space . The floor is not insulated and the heat warms the floor and comes right on up . It's a lot cheaper to run that little fan than the heat pump ,,,,,,,,,,,and I have access to unlimited firewood .