燵 - foot warmer, (kokuji)

kotatsu; table over an electric heater, with a hanging quilt to retain heat (orig. over a charcoal brazier in a floor well)

square latticed wooden frame for a kotatsu

kotatsu not put away but used in spring

futon or cloth attached to the kotatsu's frame; cover for kotatsu

portable brazier

(electric) kotatsu table