Hello friends. Ordered my Osburn 1800 insert yesterday from Tate bld supply in Cincinnati,OH should be installed in the next couple of wks. I live in a 2400sq/ft spilt level home. I wanted to go with something alittle bigger but the installer said dew to the height of my existing fireplace the 1800 would be a tight fit. Does anyone else heat with the 1800 in a split level?and if so how does it do?