Hello everyone! I am new to the wood burning insert arena and have a few questions. I would like to put a wood burning insert into my existing fireplace. I have come across a used Drolet Escape 1800-i with the faceplate and the chimney liner included. Is it ok to put in a used insert and chimney liner assuming it all fits the fireplace dimensions and chimney opening that I have? If it is, what should I look for when inspecting the unit and chimney liner? Any and all info that may help me out would be appreciated. I would like to use this insert to heat my house most of the time if possible. The main level of the house is 1250 sq. ft.