Apocalyptic landscape with burnt tree stumps and a tramp

Looking for a movie or made-for-TV movie of period ca. 1965 to 1975, probably in black & white (or the TV was b/w when I saw it as a kid in the late 1970s).

Apocalyptic landscape with burnt tree stumps which were caused by a tramp who set everything on fire to keep warm. A group of adults (2-3 men, 1 women) moved through the landscape and encountered the hobo. Later all were trapped in an iron chamber which was heated underneath, causing everybody to sweat except for the hobo who rolled on the floor and could not get enough of the heat.

Don’t know why but this scene has stuck with me for decades. What on earth is it?

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