Matte Black Cast Iron HakoneTeapot-Wood Stove Humidifier3ltr\"Unitye \"Hakone\" Matte Black Tetsubin Teapot Wood Stove Humidifier. The \"Hakone\" Teapot is an elegant cast iron tetsubin teapot inspired by highly prized Japanese antique teapots still in use today. It\'s large 3 liter capacity and robust construction makes it uniquely suited for use as a wood stove humidifier, as well as it\'s traditional use of heating water for tea. The enamel lined interior makes it rust resistant and easy to clean.