Patent ID: 6959669

Claim:
A fluid heating apparatus comprising a housing having a main chamber; a central member within said main chamber and movable relative to said housing about an axis of rotation; said central member comprising an outer surface confronting an inner surface of said main chamber and defining an annular fluid volume therebetween; a fluid inlet communicating with said annular fluid volume and situated nearer one end of said main chamber and a fluid outlet communicating with said annular fluid volume and situated nearer an opposite end of said main chamber, said fluid inlet and said fluid outlet each opening exteriorly of said housing, wherein at least one of said inner and outer surfaces is angularly inclined relative to said axis of rotation, further comprising a plurality of openings circumferentially spaced about said outer surface over a majority of length of said central member for confronting fluid entering said chamber, and wherein rotation of said central member causes said plurality of openings to impart heat-generating cavitation to a fluid entering said chamber.