Warm a Room with Only a Candle and a Few Terra Cotta Pots.The terra cotta pots concentrate the heat using convection. While you won’t heat a whole house with it, it can definitely warm your hands and make a cold night much more bearable .
This is a picture of a what a typical cup of yerba mate looks like in Argentina. The mate is served warm in a gourd and it is drank with a bombilla. Yerba mate isn't just for special occasions, it can be enjoyed on a daily basis.