Patent ID: 8173940

Claim:
A high-power plastic heater installed in an aquarium for heating water in said aquarium, comprising: a tubular plastic casing, said tubular plastic casing having a bottom side sealed and an opening formed in a top side thereof; a mica tube inserted through said opening of said tubular plastic casing into the inside of said tubular plastic casing, said mica tube comprising a bottom cap sealing a bottom side thereof, a top cap sealing a top side thereof, and a nickel-chrome steel strip wound round the periphery thereof; a circuit board affixed to the top side of said mica tube and adapted to control power on/off status of said nickel-chrome steel strip by means of a temperature control thereof; a top cover assembly mounted in said tubular plastic casing to seal said opening of said tubular plastic casing; an electrical power wire inserted through said top cover assembly in a watertight manner and electrically connected to said circuit board; an anchoring device provided at said tubular plastic casing for fastening said tubular plastic casing to an inside wall of said aquarium; and a thermal conductive filler filled in said tubular plastic casing around said mica tube.