Does anyone out there have a Stoll Heat Champion fireplace heat exchanger? Does it produce any heat? I know it would not be as efficient as a insert. I have a metal heatform fireplace which is in good condition. I do not want to cut out the damper to run a reline for a insert because is would make the fireplace useless if I moved for the next homeowner. (I would want to take the insert with me) If anyone has one of these let me know if you like it