A fan heater includes a heater body, an electric unit, a plurality of fan assemblies, and a heating element. Each of the fan assemblies is mounted with the adjacent fan assembly to form a fan unit within the receiving cavity, wherein the fan unit is operatively coupled with the electric unit for being driven to rotate by the electric unit. The heating element is mounted within the receiving cavity in a vicinity of the air outlet, and electrically connected with the electric unit for being heated up at an elevated temperature, wherein the fan assemblies are adapted to draw air flowing from an air inlet to an air outlet via the heating element, so as to heat up the air drawn by the fan unit, and deliver the heated air to a predetermined heating zone from the air outlet.