Rice cookers have two modes:
- Cook – Cooks rice until there is no water left. When that is done, switches to warm.
- Warm – Maintains a fraction of the heat.
This bugs me for two reasons:
- Warm causes the bottom layer of rice to get crispy or even burnt.
- You need to unplug it to turn it off.
My goal was to disable the warm function, giving it the modes cook and off.
By removing the warming element and disconnecting the input to the warm light, once the thermal switch triggers, no power is consumed.
The mode switching is actually quite clever. Water boils at 100ºC, and acts as a heat sink to anything above this. Once the water evaporates, the temperature can rise above 100ºC, and the thermal switch retracts. This means that when the water evaporates, my rice maker now turns off.