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WW2 German style vehicle battery or bunker heater. These were used extensively on the Eastern Front during WW2 to keep vehicle glass betteries, diesel tanks and also bunkers, tents etc warm. This specific example does not have German but Czech inscriptions, so it could have been delivered to Czechoslovakia before the war, or it is a post war remake from captured German tooling.
https://www.worthpoint.com/worthopedia/1943-ww2-wwii-german-vehicle-heater-burner-kein
https://www.worthpoint.com/worthopedia/czech-t-german-army-wwii-ww2-alcohol-103243042