We decided to buy a stove top fan, to speed up the circulation of warm air around our living room, as it can take a while for the heat that radiates from the surface of our wood burning stove to reach other parts of the room.
We identified two types of stove top fans that are free to run, and don’t require batteries or mains power. Both use heat from the stove (or more precisely heat differentials) to drive the fan and are based on elegant, albeit different, scientific principles.
1. A Seebeck effect fan is driven by an electrical current, which is generated by a thermoelectric effect (i.e. a current is produced when the junctions between different metals are at different temperatures).
2. A fan, which uses a Sterling engine to convert heat from the stove into mechanical energy. In this device, a column of air is heated, it expands, pushing a piston upward, the air is then rapidly cooled, it contracts, pulling the piston downward. The up and down movement of the piston, rotates an arm which turns the fan.
We chose a Sterling engine stove top fan, made by Kontax, a boutique engineering company based in Maidenhead, Berkshire. The fan is beautifully designed in stainless steel, glass and graphite.
This wonderful gadget works a treat. The living room now gets warm and cosy soon after we light the stove. Heat also circulates to the rest of the house. We have lots of fun and get an enormous amount of satisfaction watching the little engine bobbing elegantly up and down. It has been a great talking point with visitors too. We would highly recommend this ingenious device.