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A Built in Electric Wall Fireplace A built in electric wall fireplace is a device that is installed in an existing opening, either partially or fully. It is not movable or removed without tearing down the wall. They typically plug into standard outlets and have a variety of flame and heat settings. Some units have a rain or thunder setting for added ambience. Size Built-in electric wall fireplaces are able to be attached directly to the wall, saving space and creating a focal point for