I have recently become very attracted to the idea of owning an old style charcoal samovar. Why? Because they are really neat. Unfortunately quite expensive too. But they are a marvel of efficiency. You can have constant hot water and brew tea with one. And they use very little fuel and apparently are 70% efficient with the fuel they use. You can use charcoal, pine cones, bark, twigs, whatever to fuel one. I am thinking that once I'm on the road again this would be a very useful thing to have. I did manage to pull up a diagram of how the interior of one works, but being that it's made entirely of metal I'm not sure if I will be able to fashion one or not. I might have to have a friend of mine take a look and see if he thinks it can be done. He's done some metal working so he's got a better chance of fashioning one than I do I think.