The Iron Kettle a Japanese Family Boiled Water In for 100 Years

How does a plain iron kettle boil water every morning for 100 years while the plastic electric kettle on your counter cracks and gets replaced every few years? The answer is the Japanese nambu tetsubin, a bare cast-iron kettle from the old iron country of Iwate. This is an honest look at a buy-once object. A real nambu tetsubin costs more up front than a $30 electric kettle, around $140 to $270 from a named foundry, and it is bought a single time. We cover where it comes from (the iron towns of Mizusawa and Morioka, made a national traditional craft in 1975), the difference nobody tells you between a bare boiling kettle and an enamel-lined teapot, why the black interior is built on purpose, the white crust you should never scrub out, and the one small drying habit that decides whether it lasts a century or rusts in a month. One honest limit and all: it is heavy, it is slower than a 90-second electric boil, and it rusts if you leave it wet. The trace of iron it leaves in the water is a small dietary bonus, not a treatment for anything.