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How to Choose the Best Wall Mounted Electric Fireplaces Wall-mounted electric fireplaces are basic appliances that plug into a standard outlet. You can select a stand-alone unit that you can move around as needed, or a hearth or insert-style unit that can be mounted inside an existing fireplace cutout. The latter requires direct wiring to your home's electrical system and should be done by a professional. You can also find models that can be hard-wired or plug into. Size Electric fireplaces are cheaper to install than wood-burning or gas fireplaces.