How does the ondol floor-heating system continue to be used in South Korean homes?

The traditional Korean ondol system, which historically utilized smoke from a kitchen fire to heat stone floors, has evolved into a modern form of radiant heating. In contemporary South Korean homes, this system typically employs hot-water pipes embedded directly into the floor structure.1

This method functions as a form of panel heating, where the entire floor serves as a large radiant surface that operates at modestly warm temperatures. By heating the floor, the system provides consistent warmth throughout the living space without the need for visible equipment like radiators or convectors, which is considered a significant aesthetic advantage in interior design. While modern installations are highly efficient, they remain a direct technological descendant of the ancient ondol, maintaining the cultural preference for floor-based heating in Korean architecture.1