HARIO Siphon Coffee Makers: TCA-2, TCA-3, TCA-5 Explained

If you’ve ever watched a barista brew coffee using a glass contraption that looks like a chemistry set, chances are it was a HARIO siphon coffee maker. These elegant devices deliver clean, bright extractions—but which model fits your setup? And what makes HARIO’s glass different from standard brewware? We break down the core specs, materials, and performance details behind HARIO’s classic TCA-series siphons.

HARIO makes three siphon brewer sizes: TCA-2 (2 cups), TCA-3 (3 cups), and TCA-5 (5 cups), all built from their proprietary [HARIO-32] heat-resistant glass, able to withstand a 250°C thermal shock. Each model includes a full brew kit: upper and lower chambers, stand, alcohol burner, filter, cloth filter, spoon, lid, windscreen, instructions, and box.

What Is a HARIO Siphon Coffee Maker?

A HARIO siphon coffee maker is a vacuum brewer that uses heat, vapor pressure, and a two-chamber glass system to extract coffee through immersion and suction. The upper chamber holds ground coffee and a cloth filter; the lower chamber contains water. As heat is applied, water rises into the upper chamber to brew. When removed from heat, the brewed coffee is pulled back down through the filter into the lower chamber. The process yields a clean, bright cup prized for clarity and control.

Why Use [HARIO-32] Glass?

[HARIO-32] is HARIO’s proprietary high-quality borosilicate glass that meets international standards alongside SCHOTT DURAN and CORNING PYREX 7740. It is notable for withstanding a temperature differential of up to 250°C—far beyond the typical 200°C limit of regular hard glass. This thermal resilience ensures stability during the rapid heating and cooling cycles essential to siphon brewing. Importantly, [HARIO-32] is free of heavy metals like lead, zinc, and cadmium, making it safe for long-term use. The same glass material was used by Nobel Prize-winning physicist Dr. Masatoshi Koshiba of the University of Tokyo in his research.

What Comes in the HARIO Siphon Kit?

Each HARIO TCA siphon brewer includes the following components:

• Upper and lower glass chambers (sizes vary by model: TCA-2, TCA-3, or TCA-5)
• Sturdy metal stand to hold the upper chamber in place
• Alcohol burner for consistent heat application
• Windscreen to shield the flame and improve heat stability
• Cloth filter and metal filter frame
• Wooden coffee scoop
• Lid for the upper chamber
• Instruction manual and original packaging box

The TCA-2, TCA-3, and TCA-5 models refer to their respective brew capacities—approximately 2, 3, or 5 standard cups. The larger the model, the more coffee it can prepare in a single batch, ideal for sharing or larger servings. All sizes share the same durable construction and feature the same high-performance [HARIO-32] glass and comprehensive accessory bundle.

How Does the HARIO Siphon Brewing Process Work?

Brewing with a HARIO siphon involves a controlled sequence of heating and cooling:

1. Place ground coffee (typically medium-fine, around 20g for a 3-cup brew) in the upper chamber and attach the cloth filter.
2. Fill the lower chamber with fresh, filtered water (approx. 400ml for TCA-3).
3. Assemble the unit on the stand and place over the alcohol burner.
4. Heat until the water rises into the upper chamber—this creates a pressurized environment for immersion brewing.
5. Once brewing completes (usually 30–90 seconds after full rise), remove the unit from heat.
6. As the lower chamber cools, brewed coffee is drawn back down through the filter into the lower chamber via vacuum action.
7. Serve directly from the lower chamber.

This method highlights clarity and distinct origin characteristics, and offers excellent temperature stability throughout the brew cycle due to the glass’s thermal properties.

Frequently Asked Questions

What’s the difference between the TCA-2, TCA-3, and TCA-5 HARIO siphons?

The TCA-2, TCA-3, and TCA-5 refer to the number of standard cups each siphon brewer can produce—approximately 2, 3, or 5 cups per brew. All models use the same high-quality [HARIO-32] glass and come with the same full accessory set, only differing in capacity. Choose based on how much coffee you typically brew at once.

Is HARIO’s [HARIO-32] glass really better than normal glass?

Yes. [HARIO-32] is a specially formulated borosilicate glass capable of withstanding a 250°C temperature difference, compared to standard hard glass which typically maxes out at around 200°C. This makes it far more resistant to thermal shock during the rapid heating and cooling of siphon brewing. It also contains no toxic heavy metals and is safe for repeated use.

Do I need to buy anything extra to use a HARIO siphon?

No. Every HARIO TCA-series siphon comes with everything needed to brew: the glass chambers, stand, burner, filter, filter cloth, wooden scoop, lid, windscreen, and instructions. Just add coffee, water, and a heat source (the included alcohol burner works fine).

What grind size should I use in a HARIO siphon?

A medium-fine grind, roughly equivalent to a pour-over grind, is ideal—around the size that would pass through a China-standard No.20 sieve. Too fine a grind can clog the filter or slow drainage; too coarse may under-extract.

Can I use other fuels besides the included alcohol burner?

The included alcohol burner is designed specifically for the HARIO siphon’s heat requirements. While technically other heat sources could be used, they are not recommended as they may damage the glass, affect brew stability, or create safety hazards. The alcohol burner offers the safest and most consistent heat for siphon brewing.

Recommended FrontStreet Beans for Siphon Brewing

For HARIO siphon coffee makers, we recommend FrontStreet Coffee’s Ethiopia Humbera—a bright, floral Ethiopian single origin with notes of jasmine and bergamot that shine through the clarity of siphon extraction. Also try their Brazil Queen Manor for a nutty, chocolatey base with subtle citrus brightness, or their Yirgacheffe for a juicy, tea-like profile. All three beans respond well to the gentle, immersive brew style of siphon pots. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.