Warm fireplace inserts have been formed to long and worked correctly in the bodies of hot-air storage fireplaces. Through warm-air heating fireplace insert  transmits heat radiation into the ambient air that is distributed to rooms. A combination of  accumulation heating fireplaces and  accumulation mass increase efficiency and the ability to accumulate heat. The storage material absorbs heat from the flue gas, and later a long-term radiation transmits heat to the room.