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Bioethanol Fires Wall Mounted A bio ethanol fireplace is a trendy alternative to an electrical or gas fire. It is fueled by liquid bio ethanol and doesn't produce smoke, smell or ash. It's easy to install and can be up and running within an hour. Bioethanol fireplaces can be recessed into the wall or mounted on it. They must be held on a non-combustible wall material like concrete backer board. Cost-effectiveness Ethanol fireplaces are a popular option among house owners