I had a rudd silouette II installed Sept.21 01 in a +100 yr. old house and it works very well. my only concern is the cheap fifter that comes with the unit, that I had have to cut to fit in the filter compartment with up-flow circulation. you cannot go to your local home store and buy a standard multi-stage filter either, because they won't fit. when they designed these furnaces they didn't put any thought into the air filters! and good luck trying to contact RUDD online the web site has no contact info. For good or bad news. The 800 # they give is a promo for a sex number 1 800 848 rudd-7833. it sounds like a good price for the job anyway. depending on where you live. in n.j. I paid $2000.00 for 50k.btu silouette II installed. and no chimney liner.