PURPOSE: To fix and maintain a nozzle cleaning rod at a nozzle position and a reverse nozzle position even if any action from the outside is not given by providing fixed permanent magnets for adsorbing the base end portion of the nozzle cleaning rod.

CONSTITUTION: The base end portion of a nozzle cleaning rod 10 is movably supported in the center portion of a housing 20, a drive portion 11 composed of a metal body is connected to the reverse nozzle side of the cleaning rod 10 and the magnetic force of drive coils 40 and fixed permanent magnets 50 provided in the inside of the housing 20 is acted on respectively. Accordingly, the nozzle cleaning rod 10 is fixed and maintained at a nozzle position A and a reverse nozzle position B by the magnetic suction force of the fixed permanent magnet 50 even if the supply of electric power for the drive coil 40 is stopped. Thereby, the drive coil 40 is miniaturized to produce a small-sized and high performance oil fan heater at low cost.