Unity® "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. Its large 3 liter capacity and robust construction makes it uniquely suited for use as a wood stove humidifier, as well as its traditional use of heating water for tea. The enamel lined interior makes it rust-resistant and easy to clean. Stainless steel infuser not included. Item # 1026MB