Not sure if this is the correct forum but it seems to make sense. So this is our first year of burning and we don't have a ton of seasoned wood. A friend of mine, who seems to know everyone, has access to coal lumps. The way it sounds they may be coming free, so tough to pass up. I am wondering if there would be any ill effects to mixing coal with wood. I have a Clayton 1600m which states I can burn either or, but I am thinking if I had some lumps I could just throw them in there as needed. Seems I have read that they burn hot and long. Thanks for the info.