Abstract: A heat generator having first and second members disposed around a shaft. One of the members has an electrically conducting portion and the other of the members has magnets mounted thereon opposite the electrically conducting portion. A passage for fluid to be heated between the magnets and the electrically conducting portions is thus formed. The magnets are arranged so that their magnetic fields intersect the electrically conducting portions. The heat generator includes an impeller and heats liquid as the high pressure drive of a hydraulic motor.

Abstract: A heat generator comprises a fluid input and fluid output, an electrically conducting disc mounted on a shaft, a plurality of magnets with their N-S axis aligned parallel to the plane of the first disc are mounted either side of the disc, a plurality of runner vanes upstanding from the disc and forming a plurality of widening fluid paths towards the magnets and allow fluid to flow over a vane free portion of the disc to exit the heat generator though the output. Drive systems are described in which high pressure fluid from a hydraulic motor connected to a turbine or Archimedean screw is used to drive the disc.

Abstract: A heat generator comprises a rotatable magnetic field and a heat exchanger (26) including a fluid path (45) for water set into an electrically conducting disc. An entry to and exit from the fluid path is provided for the water. Heat generated by rotating the magnetic field is transferred to water passing though the fluid path in the electrically conducting disc.