Hey guys! New to the board and have a question about trying to replace a pre fab heatalator with a more efficient insert. I have called a couple of different places locally and they all say that you can't do it and need a zero clearance to install inside the heatalator. I don't want this. I have an 8" flue creekstone hearth, 3000 sqft. A frame style house with 25ft ceilings. I have looked at the buck model 81. Also the quadra fire but they seem to be quite pricey. Any suggestions????