# What Is a Yuzamashi? The Cooling Bowl Explained

**By Slow Social Club** · 2026-04-10

# What Is a Yuzamashi? The Cooling Bowl Explained

Yuzamashi (湯冷まし) translates literally as 'hot water cooler'. It is a vessel — typically ceramic or porcelain — used in Japanese tea preparation to cool boiling water down to the correct temperature before it meets the matcha or tea leaves.

## Why cooling water matters for matcha

Matcha is sensitive to temperature. Water at or near boiling scalds the powder, drawing out bitter tannins at a much higher rate than water at the correct temperature. The ideal range for ceremonial matcha is 70–80°C. A yuzamashi allows you to boil water — ensuring proper sanitisation — and then cool it quickly by pouring it into the vessel, where it loses heat through the wide ceramic surface.

## What a yuzamashi looks like

Traditional yuzamashi are wide, shallow ceramic or porcelain vessels with a pour spout. They come in a wide range of designs, from simple white porcelain to elaborately glazed ceramic pieces. Their shape maximises the surface area of the water, allowing rapid and even heat loss.

## How to use one

Boil water in a kettle. Pour it into the yuzamashi and wait approximately two to three minutes — the water will cool to around 70–80°C. Pour from the yuzamashi into the chawan over the sifted matcha. Whisk.

## Do you need one?

Not necessarily. Effective alternatives:

-   A variable-temperature kettle that sets 70–80°C directly
-   A thermometer to check water temperature
-   Boiling and resting five minutes in the kettle (drops to approximately 80–85°C)

A yuzamashi adds to the ritual and aesthetic of preparation in a way functional alternatives do not. For those who value the ceremony aspect, it is a worthwhile addition.

**Tags:** matcha cooling bowl, water temperature matcha tools, what is yuzamashi, yuzamashi

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> Source: [Slow Social Club](https://slowsocialclub.com/blogs/journal/what-is-a-yuzamashi-the-cooling-bowl-explained)