As we make progress with the rating testing of our institutional improved cook stove different models, Rose at Chemiphar explains how a good stove can boil water for 30 minutes or more, without the need of adding any extra fuel. In this short demo, she is boiling 70 litres of water in a 100 litres saucepan, using a locally manufactured rocket stove.

Because the internal combustion chamber is hot from the previous two phases (the cold and hot start), the heat contained is enough to keep the water (of food) boiling for a period of time without adding more firewood, thus proving that the stoves are very efficient indeed in saving firewood.