Merry Christmas to all. Hope you all had a great day with family and friends. Here in Minnesota it was almost 40* today and no snow, can't beat that. I had a top shelf on top of the refractory block that made the heat all travel around the front and long path to the exit, but alas it finally broke and I don't have any more of that refractory board or know where to get it. Just wondering if others have used this shelf and what was your opinion of its effectiveness on efficiency and burn times. Mine has been gone so long now I wonder if I should get another shelf or not. Just trying to limp along with this not so old Adobe as long as I can. Would like to get a different boiler but don't really want to spend the money required and not real sure what I would get anyway since this part of MN really doesn't have anybody selling gassers.