noun
portable kotatsu; movable heated table
A kotatsu that can be placed anywhere, as opposed to a built-in hori-gotatsu. Uses a brazier or electric heater underneath.
祖母は冬になると居間に置き炬燵を出す。
My grandmother brings out the portable kotatsu into the living room when winter comes.
この置き炬燵は軽いので、好きな場所に移動できる。
This portable kotatsu is light, so you can move it wherever you like.
Compound of 置き (oki, 'placing') + 炬燵 (kotatsu, 'heated table'). The spelling 炬燵 is ateji; the word kotatsu itself derives from Chinese 火燵 (huǒtà).