The fireless cooker or food warmer is built with locally available materials and is used to keep food warm and to allow the cooking of food with less fuel.
To use a fireless cooker, first bring food to the boiling point using a three stone or modified stove. The stove can now be extinguished and the food is put into the fireless cooker which is well insulated and keeps the food from cooling down.
The food cooks slightly slower than if it was directly on the stove, but the saving in firewood can be large. The fireless cooker is portable, and can be carried around easily. A well made fireless cooker can keep food and water warm for up to 8 hours after it has been heated.