Kotatsu

A is a low, wooden table frame covered by a ''futon'', or heavy blanket, upon which a table top sits. Underneath is a heat source, formerly a charcoal brazier but now electric, often built into the table itself. ''Kotatsu'' are used almost exclusively in Japan, although similar devices for the same purpose of heating are used elsewhere, e.g. the Spanish ''brasero'' or Iranian ''korsi''.

History

The history of the ''kotatsu'' begins in the Muromachi period or Ashikaga shogunate during the fourteenth century. Its origins begin with the Japanese cooking hearth, known as the ''irori''. Charcoal was the primary method of cooking and heating in the traditional Japanese household and was used to heat the ''irori''. By the fourteenth century in Japan, a seating platform was introduced to the ''irori'' and its cooking function became separated from its seating function. On top of the wooden platform a quilt was placed, known as an ''oki'' that trapped and localized the heat of the charcoal burner. This early ancestor to the modern ''kotatsu'' was called a ''hori-gotatsu''. The word ''hori-gotatsu'' () is derived from the kanji (hori) meaning ditch, digging, (ko) meaning torch or fire, and (tatsu) meaning foot warmer.

The formation of the ''hori-gotatsu'' was slightly changed in the Edo period during the seventeenth century. These changes consisted of the floor around the ''irori'' being dug-out into the ground in a square shape. The wooden platform was placed around this, making a hearth. Then the blanket was placed on top of the platform again, where one could sit with legs underneath to stay warm.

The moveable ''kotatsu'' was created later, originating from the concept of ''hori-gotatsu''. This ''kotatsu'' came about with the popular use of ''tatami'' matting in Japanese homes. Instead of placing the charcoals in the ''irori'', they were placed in an earthen pot which was placed on the ''tatami'' making the ''kotatsu'' transportable. This more modern style ''kotatsu'' is known as the ''oki-gotatsu''. The word ''oki-gotatsu'' () is derived from the kanji (oki) meaning placement, meaning torch or fire, and meaning foot warmer.

In the middle of the twentieth-century charcoal was replaced with electricity as a heating source. Instead of having the moveable earthen pot of charcoals beneath the ''kotatsu'', it was possible to attach an electric heating fixture directly to the frame of the ''kotatsu''. By 1997, the majority (approximately two-thirds) of Japanese homes had the modern ''irori'' and 81 percent had a ''kotatsu'', though they are warmed using electricity instead of glowing coals or charcoal. Thus, the ''kotatsu'' became completely mobile with electricity and became a common feature of Japanese homes during winter.

Types

There are two kinds of ''kotatsu'' used in Japan today, differing in the configuration and the type of heating:
*Electric: The modern style of ''kotatsu'', , consists of a table with an electric heater attached to the underside of the table. This evolved from a clay pot with hot coals placed under a table. The ''kotatsu'' usually is set on a thin ''futon'', like a throw rug. A second, thicker blanket is placed over the ''kotatsu'' table, above which the tabletop is placed. The electric heater attached to the underside of the table heats the space under the comforter.
*Charcoal: The more traditional type is a table placed over a recessed floor, . The pit is cut into the floor and is about 40 centimeters deep. A charcoal heater is placed somewhere in the pit's floor, walls, or, as in the modern-style ''kotatsu'', attached to the table-frame. There are pit-type ''kotatsu'' with an electric heater too.

Use

In the twenty-first century, the ''kotatsu'' typically consists of the electric heater attached to the frame, which is no longer limited to wood, but may be made of plastic or other materials. Generally, a blanket (or ''shitagake'') is draped over the frame and heater and under the table-top. This first blanket is covered by a second heavier blanket, known as a (). A person sits on the floor or on ''zabuton'' cushions with their legs under the table and the blanket draped over the lower body. The ''kotatsu'' was designed when people most commonly wore traditional Japanese style clothes, where the heat would enter through the bottom of the robes and rise to exit around the neck, thus heating the entire body.

Most Japanese housing is not insulated to the same degree as a Western domicile and does not have central heating, thus relying primarily on space heating. Heating is expensive because of the lack of insulation and the draftiness of housing. A ''kotatsu'' is a relatively inexpensive way to stay warm in the winter, as the futons trap the warm air. Families may choose to concentrate their activity in this one area of the house in order to save on energy costs. In the summer, the blanket may be removed, and the ''kotatsu'' used as a normal table.

It is possible to sleep under a ''kotatsu'', although unless one is quite short, one's body will not be completely covered. This generally is considered acceptable for naps, but not for overnight sleeping for many reasons: one's body is not completely covered, yielding uneven heating; the table is low, so one may touch heating elements accidentally when moving while asleep, risking burns. Traditionally, children are told that they will catch a cold if they sleep under a ''kotatsu''. Pets such as cats frequently sleep under ''kotatsu'', however, and are small enough to fit completely underneath—comparable to cats who sleep on floor heating vents in Western countries (Japanese homes do not generally have floor heating vents).

During the winter months in Japan, the ''kotatsu'' often is the center of domestic life. In the evening family members gather around the ''kotatsu'' to enjoy food, television, games, and conversation while keeping the lower half of their bodies warm. It has been said that "once under the ''kotatsu'', all of your worries slip away as a familiar warmth takes over and you become completely relaxed."

Historically, were made of bast fibers. Later, cotton was introduced (1300s to 1700s, depending on region) and they were usually made of bast-filled quilts of recycled cotton, dyed with indigo and pieced from old garments in boroboro style. , for going under the , as a floor covering, were made the same way. In the 2010s, ''kotatsu-gake'' were often decorative and might be designed to match home décor.

Other countries

There are similar systems in countries around the world: economical and often sociable ways to keep warm while sitting still. In Spain and Portugal, the ' is a small round table with a ''brasero