Gaiwan vs kyusu
Two small brewing vessels from two traditions, both designed around pouring off completely and quickly, and both frequently bought by the same person for the same reason. What separates them is the filter, and the filter decides which leaf each one can handle.
equipment
What is being compared
Why these get confused
Both are sold as ‘the small teapot for serious tea’, which hides the one functional difference that decides between them. A gaiwan has no filter at all, and that is a design choice rather than an omission.
Point by point
| Aspect | Gaiwan | Kyusu |
|---|---|---|
| How the leaf is held back | By the lid, angled by hand against the rim. Nothing is built in. | By a wide ceramic mesh across the whole spout wall. |
| Fine or broken leaf | Passes the lid gap. Deep-steamed sencha in a gaiwan is a mess. | Handled easily — this is exactly what the mesh exists for. |
| Material | Usually glazed porcelain: entirely neutral, so one vessel serves a whole catalogue. | Glazed or unglazed ceramic. Unglazed Tokoname seasons like any clay pot and is kept for one style. |
| Capacity | 100 to 150 ml. | 150 to 400 ml. |
| Heat on the hands | The rim gets hot. Filling to the rim rather than below it is what burns beginners. | Insulated by the handle; no technique required. |
| Smelling the tea | The lid holds the aroma and is meant to be smelled between infusions. | No equivalent. The aroma is judged in the cup. |
| Holding a temperature | Wide and shallow, so it sheds heat quickly. That suits Chinese greens and delicate oolongs, and works against you if you want to hold a high temperature. | Suits the low temperatures Japanese green tea wants — around 60–70°C for gyokuro, 70–80°C for sencha — and the ceramic holds that steadily. |
| What it suits | Oolong, white and dark tea; anything whole-leaf where the change across a session matters. | Japanese green tea, and particularly the deep-steamed styles nothing else pours cleanly. |
The short answer
Neither is an upgrade on the other. If most of what you drink is Japanese green tea, the kyusu is the correct first purchase and a gaiwan will frustrate you; if it is oolong and pu-erh, the reverse.
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