- Fri. 9:00 am - 6:00 pm (EST) a Read these instructions completely before beginning installation. Failure to follow them could cause a heater malfunction resulting in serious injury and/or property damage. WARNING: All electric heaters have hot and arcing or sparking parts inside. Do not use it in areas where gasoline, paint or flammable liquids are present. WARNING: This electric fireplace is tested and listed for use only with the optional accessories listed in these instructions. Use of