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A Built in Electric Wall Fireplace A built-in electric wall fireplace is a device that is installed inside an existing opening. It is not movable or removed without tearing down an area of the wall. These units typically plug into standard outlets and have a variety of flame and heat settings. Some units have a rain or thunder setting to provide additional atmosphere. Size Built-in electric wall fireplaces are able to be attached directly on the wall, reducing space and creating a focal point