The best fan heater on the market is the Lasko 754200 Ceramic Heater with Adjustable Thermostat. This heater has an adjustable thermostat so you can set it to your desired temperature, and it also features a fan-only setting for when you just need a little bit of airflow. It's compact and lightweight, making it easy to move from room to room, and it comes with a 3-year warranty.