I currently have a Heatilator 42c that is 9 years old and want to replace it with something more efficient. From my research, I think the easiest (cheapest) would be a zero clearance insert. My problem is locating exactly which would work best. I've called a few local fireplace stores and they don't seem interested in this project or don't understand what I want. Can you guys give me some suggestions. I know this wont be cheap but don't have an unlimited budget.