Cold brew tower glass

The cold brew tower glass is an elegant slow-drip equipment for making iced coffee, commonly found in specialty coffee shops.

About this subject

The cold brew tower glass, also known as a slow-drip cold brew tower, is a device designed to extract concentrated coffee through a slow and controlled drip process. The system consists of an upper chamber holding cold or room-temperature water, which drips one drop at a time onto a bed of coarsely ground coffee, usually held in a paper or metal filter. The extracted coffee collects in a lower vessel, forming a concentrate that can be diluted with water or milk.

This technique originates from the Japanese Kyoto-style cold brew method, dating back to the 17th century. The glass tower provides an elegant visual display, allowing baristas and customers to observe the entire extraction process. Brew time ranges from 3 to 12 hours, depending on the drip rate and recipe, resulting in a coffee with low acidity, smooth body, and complex aromatic notes.

Today, cold brew towers are a highlight in many specialty coffee shops worldwide, especially among the 2026 trends. Beyond functionality, they serve as decorative pieces and demonstrations of technique. Borosilicate glass is the most common material due to its thermal shock resistance. Some models feature stainless steel taps for serving directly from the tower.

Interestingly, the method's popularity grew with the third wave coffee movement, which emphasizes the science and art behind extraction. For home users, there are smaller versions that fit in a refrigerator, but the principle remains the same: patience and precision to obtain a superior-quality iced coffee.

Frequently Asked Questions

What is the difference between a cold brew tower and the traditional immersion method?

In a cold brew tower, water drips slowly over the coffee, extracting only some compounds, resulting in a cleaner, smoother profile. Immersion (e.g., French press) keeps coffee in constant contact with water, producing a fuller body and more oil extraction.

How long does it take to brew coffee in a cold brew tower?

It takes 3 to 12 hours, depending on the drip rate and coffee amount. Adjusting the faucet opening or drops per second allows control over speed.

Is it difficult to clean a glass cold brew tower?

No, most models are disassemblable and can be washed with warm water and mild detergent. Glass parts can also go in the dishwasher, but rinse well to avoid soap residue.