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5 Best in Wall Electric Fireplaces A plug-and-play electric fireplace adds warmth and ambiance to any room. Our top choices have adjustable features, like various flame bed and LED colors, as well as a non heat mode for a calming glow. These thin wall-mount electric fireplaces can be built into the wall or attached to an existing mantelpiece. Some require complex installation that may require expertise in carpentry or expert assistance. 1. Dimplex Revillusion Revillusion is changing how electric fireplaces are seen.