An inset stove is built into a wall or false chimney breast. Inset stoves give you a ‘window of flame’ in your wall and are available in many different types, for example double sided inset stoves, ones with curved fronts, or huge wide letterbox insets with doors that slide up and into the wall. Inset stoves are sometimes called insert stoves. A cassette stove on the other hand is an inset stove with a second layer of metal around the firebox which forms an air gap around the stove allowing heated air back into the room. Cassette stoves may sometimes be a little simpler to install.