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Induction heating has by far been the most successful technique to date. This method uses a simple sine-wave oscillator
to generate a magnetic field in a simple coil.

When a magnetic material, such as steel, tinplate, or stainless-steel is placed inside this coil, the magnetis field cases the container to heat up rapidly. Temperatures of hundreds of degrees have been obtained within a minute or so of immersion inside the coil.
This is more than adequate to heat the material and obtain water extraction.

2wireheater  water extractor
2-wire coil with steel core                                                water extractor first prototype using 3-wire coil

watercopper        water3

water collected on copper plate                                water collected on copper and aluminium plates

Circuit diagram of induction heater circuit, first used to test the process:

induction heater circuit
induction heater circuit