Great forum - have learned alot but would like some advice. We built 5 years ago and our fireplace in the Great room is one of the typical small-low cost units. Works fine but someday I want to upgrade the unit for more efficient BTUs. I checked out inserts but the only insert that would fit is very small and produced less than 20000 BTUs. My thought is to remove the existing fireplace and replace it with...??? This unit will serve to assist my geothermal furnance in bitter weather as well as be enjoyed throughout the winter season. I have plenty of wood (15 acres) so I am looking for a stove type unit. Upstairs is 2000 sq ft - sort of open. Any ideas / suggestions...? Thx...!