By placing the fire and chimney on opposite sides of the house and constructing a tunnel between them, heat is pulled through the tunnel, heating the floors and helping distribute heat more evenly.
this post was submitted on 07 Oct 2023
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as far as i'm aware (not korean, never been there, just an internet weirdo) ondol heating of a sort is still used for the floors in korea. i assume it's more of a radiator system now though?
Yes. (Linked article is Korean)
Modern ondol systems use piped hot water. One of the pleasures of being in Korea in winter is finding a literal hot spot to sit or lie on, since the heating is not perfectly even.