For cooking, the kettles are usually suspended from the ceiling with a decorative hook, jizaikagi. The one from this photo is designed in the shape of a fish, but the mallet of the god Daikokuten, symbol of prosperity, is also a popular choice.
For heating or for cooking, because the traditional Japanese house has no chimney, the preferred fuel used in the irori is charcoal, because it produces less smoke...
EXIF info:
Fuji X100
Lens: Fujinon
Focal Length: 23mm
Aperture: F/4
Shutter Speed: 1/56s
ISO Sensitivity: ISO 800