Japanese Tetsubin: Cast Iron Teapots Explained
Nanbu ironware — beautiful, functional, and built to last.
What Is a Tetsubin?
A tetsubin (鉄瓶) is a Japanese cast iron kettle used to boil water for tea. Originating from Iwate Prefecture's Nanbu ironware tradition (400+ years old), tetsubin are both functional tools and art objects.
Tetsubin vs Tetsu Kyusu
Tetsubin — for boiling water directly on a stove. No enamel lining. The iron enriches the water with minerals.
Tetsu Kyusu — for steeping tea. Enamel-lined interior. Cannot be heated on a stove. This is what most Western retailers sell as "cast iron teapot."
Benefits
- Better-tasting water — Iron softens water and adds trace minerals
- Heat retention — Keeps water hot for 30+ minutes
- Durability — With proper care, lasts generations
- Beauty — Each piece features traditional Japanese patterns (arare dots, pine needle, cherry blossom)
Top Brands
- Iwachu — Largest Nanbu ironware maker. Reliable quality. ¥8,000-30,000.
- Oigen — Modern designs meets tradition. ¥10,000-40,000.
Care
Never use soap. Dry completely after each use to prevent rust. If rust appears, boil tea leaves in it — the tannins create a protective coating.
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