Friction heat generator
Friction heat generator
Friction heat generator
Friction heat generator
Friction heat generator
Friction heat generator apparatus
Friction heat generator suitable for automobile vehicles
Friction heat space heater
Friction space heater
Heat generating apparatus by use of multistage rotary means
Heat generator apparatus
Heat generator for a circulating heating system
Heating device
Hydraulic friction heat generator
Hydraulic friction heater
Impellers and apparatus for use therewith
Kinetic heater
Liquid heating device
Method and apparatus for heating a liquid medium
Method and apparatus for heating a liquid medium