Hello to all. I currently have a Harman P61 in my downstairs family room. It is a 2100 sq ft bi-level ranch. I was going to put a wood stove upstairs, but the wife talked me out of it and wanted to deal with just one type of fuel. She does make sense for once! Anyway, I was looking at the XXV and the P43. Its going to be a corner installation in my living room with cathederal ceilings. Its about 1400 to 1500 sq ft up there. I have been running the P61 for 6 plus years trouble free. Just looking for some insight. Thanks to all!