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Kotatsu is described in multiple online sources, as addition to our editors' articles, see section below for printable documents, Kotatsu books and related discussion.

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This Kotatsu and Comforter Set is all you need for a toasty winter
If you've ever seen anime or lived in Japan when it's cold, then you've likely heard of a Kotatsu. It's a low table that stands no higher than a coffee table, but has a heater under it with a blanket cascading down from all sides.
You'll Never Want To Leave Bed Again With This Incredible Japanese Invention
According to Japanese blogs, kotatsu is a traditional home center for many families. "It's always warm under the table, so everyone gathers around to cook nabe (hot pot) on a portable stove, eat mandarin oranges and watch television," informs Nippon.
In Japan, they have beds with in-built heaters and table tops to keep them
The kotatsu is a traditional Japanese table, which comes covered with a blanket and has a heater placed underneath.
Kotatsu Japanese Couch Bed Defines Perfect Way To Relax And Keep Warm In
The kotatsu is believed to have originated in the 14th century as a cooking hearth, which later became a movable piece of furniture, according to Bored Panda.
Lower heating bills with this wacky multifunctional Japanese invention
Sitting by the kotatsu heating table, under a thick blanket, is still the way for entire families to keep warm on winter evenings.

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