Ive been lurking on this site soaking up as much as I can and first I just want to say thanks for all the information. It is a touch daunting though and I finally joined after reading posts since october trying to figure out what I needed to do. Yeah. I meant my title too. I have a Hardy H4 at the 100 year old 3000sq ft poorly insulated house I just purchased. Apparently everything appears to be updated except the darn insulation. Very frustrating, but I am starting there and foaming in the crawl space,etc and I found out there is NO attic, they sealed in the rafters just like the walls for extra space. So, im loosing quite a bit of heat there. But doing my best. The first priority is replacing the propane furnace as it is 20 years old and my wife says I "must" do that first. I am looking to figure out the best option for a replacement for the Hardy (still have lines and heat exchangers that function "reasonably" given they were installed in 1990. I measured not ideal but about 5% temp loss over the run (so double that for both ways). I know this needs to be fixed but it isn't "horrible" but the Hardy is terribly inefficient and literally eating wood. Propane would make me bankrupt of course. What are some reasonable alternatives to upgrade the Hardy without dropping 10K+? Assuming I can just plug it up to what I have? I may upgrade to something very high end but it will be another 5-10 years. I also cant find any dealers locally cause I don't know where to look I guess except standard OWB like Bryant (forced air, Hardy is EVERYWHERE, and a various others that don't even appear to have a secondary burn chamber. For a frame of reference when I say "forest eater" the Hardy is literally eating slightly more than a cord a WEEK since Dec 9 when I first cut it on. Heats the house well, but Dang man.