Patent ID: 7318553

Claim:
A fluid heating device comprising a housing having an internal chamber and a fluid inlet and a fluid outlet in fluid communication with said chamber; a rotor disposed centrally in said chamber and mounted for rotation within said chamber about an axis of rotation, said rotor in spaced relation to said housing to provide a generally annular passage for fluid to travel from said inlet towards said outlet, said rotor having a plurality of interior passageways formed therein and a plurality of openings formed on an exterior surface thereof confronting fluid in said passage and disposed in a plurality of circumferential rows spaced about said rotor along the longitudinal axis of said rotor, wherein said exterior surface of said rotor terminates at first and second planar end faces on said rotor, and wherein one of said plurality of interior passageways is a longitudinal passageway extending along said axis of rotation for a distance greater than the distance between said first and second planar end faces, wherein rotation of said rotor causes said plurality of openings to impart heat-generating cavitation to a fluid entering said chamber.