Marcello is an elegant furnace. It has a size and form that makes it suitable for many types of homes, not at least modern homes. The technical design makes that it, despite its relative small size, can retain heat for many hours. Its esthetics are characterized by stone, glass, and clear lines, such that the old, traditional principles ensuring that the heat is retained at its best, without the furnace becoming too large, is combined with modern design trends. The furnace can be placed in a corner, along a wall, or in the middle of the room. The furnace can have smoke exit from the side, back or from the top.