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Sadly even coal is expensive in the rural areas of South Africa. They turn to Paraffin for a cheaper fuel to burn but it doesn't always help. A friend of mine showed me a rocket-geyser for hot water, it was amazing how much hot water you can get from just a cup of burning paraffin. But burning coal or wood has serious complications not only for the people with health issues (you have to see what it looks like when everyone in a camp burns wood on a cold winter evening) but also for the the environment.