Inset Stoves and insert / cassette stoves are fitted into or built into a suitable opening. Similar to Convector Stoves they have an air layer around the main stove body and are designed to heat the room just as effectively and efficiently as freestanding stoves. Inset stoves can sit on a hearth with a three sided frame or off the floor, in the wall, with a four sided frame. Often we install inset stoves into existing fireplace surrounds/ mantle pieces where the opening can be formed with natural stone slips and header.