b) Rocket Stoves: Downside the wood needs to be chopped into small pieces. I have not seen one in SL. Does not mean there are none around.
We/I use the double stove, readily available all over the country for around 150-250 LKR. It really cuts down on the firewood use and can have two pots being cooked at the same time. Unhappily I rarely see households using the double stove in this part of the country. The women walk half or more kilometer (depending on economic status) and gather firewood even though this area borders jungle. Thats because the village proper, is urban in the sense there are very few trees/firewood within the village. Some villagers have have even commented after seeing the double clay stove why I bother. Yes some of those houses will have 50K sound setup or 30K flat screen TV, but not a 150-250 LKR stove that will cut down on firewood usage.