Ondol (ON-dol; / ˈɒn.dɒl /, [1] Korean: 온돌; Hanja: 溫突/溫堗; Korean pronunciation: [on.dol]) or gudeul (구들; [ku.dɯl]) in Korean traditional architecture is underfloor heating that uses direct heat transfer from wood smoke to heat the underside of a thick masonry floor.

The system that Wright had experienced in Japan was the Ondol (or Gudeul), a traditional Korean method of underfloor heating. Thanks to Ondol, even the poor can pass winter in warmth. Because Korea's history of heating technology goes back to prehistoric times, it is impossible to be precise about the Ondol (or Gudeul)'s date of origin.

Jan 5, 2025 · Ondol, also known as Gudeul, is an incredible underfloor heating system that’s existed for centuries in Korea. The general idea of an Ondol system is that it harnesses the power and pressure of the flow of smoke from the fireplace (traditionally used to cook meals and rice) to heat up the house, rather than using heat directly from the fire ...

"Ondol" is the Chinese character for the Korean term "gudeul," which literally means "baked stones." Thus, ondol refers to a system of heating in which stones are "baked" to heat the floor and with them the room—an extraordinary system entirely unique to Korea that does not exist elsewhere in the world.

In pure Korean, it is called “gudeul.” While the west uses in-room fireplaces to heat the air directly with convection heat, the ondol is a heating system that uses radiant heat to heat the floors and warm the air. The key component in ondol technology are the “gorae.”

In its traditional form, the ondol utilizes direct heat transferred from wood smoke to the underside of a thick masonry floor. In modern times, the term ondol refers to any type of under-floor heating in Korean housing. "Gudeul," meaning "baked stone," is another name for an ondol.

The term gudeul, which has the same meaning as ondol, has been recorded as the term used colloquially for the modern day ondol in Korea for over two thousand years. Korean historians have recorded the use of ondol in traditional Korean housing, called hanok, as beginning around the end of the 19th century.

Ondol (온돌;溫突), also known as goodle (구들) or banggoodle (방구들), is an underfloor heating system that has kept traditional houses in Korea warm for thousands of years.

Apr 30, 2018 · Ondol, literally "warm stones," refers to an underfloor heating system unique to Korea. It has its roots in a primitive form of heating based on a hearth and flues dating back to the Bronze Age and the Proto-Three Kingdoms period.

Dec 4, 2021 · The stone slabs called “gudeuljang,” on which the indoor floor sits, are constructed with flat stone slabs and clay mud. Covered with oiled hanji, or mulberry paper, the elevated floor becomes a...