Thermal Convection Stirrer as sold in Australia
24 volts 6 watt heater/light
Does not have magnets, does not use a spinner or spin bar.
How does it work?
A bit of heat is applied the the bottom, warm rises to the top through the center, spreads out contacting the cooler sides and sinks down along the outside edge forming a torrid [doughnut] shaped stir pattern.