These electric heaters mount on walls and ceilings to provide spot, supplementary, or primary heat without taking up floorspace. Recessed and drop-in heaters install inside an opening in the wall or ceiling. Surface-mount heaters are positioned directly on the wall or ceiling. Suspended unit and infrared radiant heaters hang from the wall or ceiling. Hazardous-location heaters are used in environments where potentially explosive or flammable vapors may be present. Washdown heaters are used where equipment frequently needs to be washed or hosed off. Heater thermostats and accessories are used to mount and install heaters, replace worn or damaged parts, and control the temperature.