Sorry, I didn't answer that question about MeMco's. There are quiet a few of them around here. They were available cheap because everyonetook them out after putting them in during the 70's energy shortage. Most of them were installed improperly and just chewed up wood. Or they over heated the house and blew steam everywhere. I put a boiler plate in the top of mine just under the "tongue" that sticks out from the back wall. This just delays the hot smoke/gases a little longer in making a real hasty exit up the chimney. It has made a big difference in efficiency I believe. Can't prove it. As far as coal is concerned, the fire box is to wide,long, and shallow to be good as a coal stove. However, I have tinkered with it and found that I can still get better results with a mixture of nut(to keep the pea from going down through the grates) and pea then with wood alone. I sometimes use wood on the sides to "narrow" up the firebox. The addition of a Barometric damper that I would never us with an all wood stove is really helping. The infomation available on this excellent forum has been super. I am looking to have an auger feed coal boiler of some sort by next winter. Then a few of you will be answerering tech questions about how to run that I am sure.