In the process of installing my used NC30 now. I have a tight fireplace opening and a lined chimney....I'm going with one of theseNC30 is probably the best bang for your $$, plus its a longer rectangle type stove so you can have the rear of the stove into the existing fireplace to ease with hooking up the liner. I highly recommend stuffing roxal or other fire proof insulation in the upper part of the fire place then make a simple block off plate to keep the heat from going up the chimney.