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this design is to slove the problem of getting hot water from country family.
The principle of the hearth is add another brass to the middlle of the original
hearth, the fill water to the brass.When you make fire and cook something, the
brass will absorb the quality of heat, then heating the water of the brass.Not only
save your time but also save the energy.It will be more convennent !
Chengdu university of technology