Patent ID: 8242419

Claim:
An aquarium heater for an aquarium comprising: a tubular plastic housing having a closed bottom side and an opening in a top side thereof; an anchoring device connecting said tubular plastic housing to an inside wall of the aquarium; a top cover adapted to close said opening of said tubular plastic housing; a power cable inserted through said top cover in a watertight manner and suspending in said tubular plastic housing; a positive temperature coefficient element electrically connected to said power cable and longitudinally positioned in the longitudinal center of said tubular plastic housing for generating heat when said power cable is electrically connected to a power source; two metal radiation fins, each metal radiation fin of the two radiation fins has a shape of a semi-circular tube including a flat surface and a curved surface, each curved surface of the metal radiation fin has an opening located at a middle section of the curved surface and extending a length of the metal radiation fin, said positive temperature coefficient element is located between the two metal radiation fins; and a thermal conductive filler filled in said tubular plastic housing around said positive temperature coefficient element and said two metal radiation fins.