Mechanical Heaters


There are two classes of machines that transform a small amount of mechanical energy into a large amount of heat. The best of these purely mechanical designs are the rotating cylinder systems designed by Frenette (USA) and Perkins (USA). In these machines, one cylinder is rotated within another cylinder with about an eighth of an inch of clearance between them. The space between the cylinders is filled with a liquid such as water or oil, and it is this "working fluid" that heats up as the inner cylinder spins. Another method uses magnets mounted on a wheel to produce large eddy currents in a plate of aluminum, causing the aluminum to heat up rapidly. These magnetic heaters have been demonstrated by Muller (Canada), Adams (NZ) and Reed (USA). All of these systems can produce more heat than standard methods using the same energy input.

Below are two patents relating to this technology that you might want to look up.


  • Frenette -USP #4143639
  • Perkins - USP #4424797

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