Coffee related questions

Cold brewed coffee

Q. About MCPN-14B, is it possible to make 4 cups of coffee using a pot for 8 cups?

A.  Unfortunately, it is not possible to make 4 cups of coffee with a pot for 8 cups.
The strainer carrying the coffee grinds cannot reach the water for 4 cups. Therefore, the coffee cannot be brewed properly.
The 8 cups pot is designed to make the exact amount (roughly 1000ml) for 8 people at one time.

Cloth drip

Cloth filter
Q. How can you tell which side faces in and which side faces out?

A.  Please make sure the smooth cotton side faces out. Having the side with standing fibers facing in allows the fibers to be moistened and the flavors of the coffee is extracted through the fine weave of the fabric.

Q. Why does it have to be immersed in water?

A.  If a cloth filter is dried out in the sun or by any other method, the coffee components that have been absorbed by the cloth filter are oxidized. The next time cloth filter is used a strange odor will arise from the coffee. In order to keep brewing good coffee, it is crucial to make sure the cloth filter does not dry out.
After you have brewed coffee with the cloth filter, wash it well with water and then store it in the refrigerator immersed in water.

Q. When should I replace it?

A.  It is hard to say exactly when to replace it, since that depends on usage and other factors.
A good indicator is when the fibers on the inside begin to fray after continuous washing and wringing. Another good time to replace it is when the brewing time becomes shorter.

If it is used once a day in a household then it should be replaced in about 1 month.
*If the cloth filter will not be used for a long period of time, wrap it in plastic wrap or put it in a Ziploc while it is still wet. Make sure it is sealed and store it in the freezer.


Q. Can I grind anything other than coffee beans? (Soy beans, sesame seeds, etc)

A.  Unfortunately, Hario’s coffee grinder is strictly for grinding coffee beans only. Please refrain from using it for any other purpose.

Q. How long the burr will last?

A.  The burr is either malleable cast iron or ceramic. As long as it is not dropped it will not chip or break. If handled with care, it will last a very long time.

Q.  When grinding coffee beans using the Ceramic Coffee Mill Skeleton it slides on the table. What should I do?

A.  Try placing a damp cloth or towel or a rubber mat underneath to stop the grinder from sliding. Once the grinder has been secured less power is needed to support the grinder.
This will make it easier to grind the coffee beans.

Q. What are the benefits of a ceramic burr?

A.  Ceramic burr, unlike metal burr, conduct less static during the dry winter season.
The coffee will not scatter as much from static when grinding the beans.

Q.  I feel the burr is idling. Is there any way to fix it?

A.  Please check if you set the adjustment nut too tightly to grind beans at fine level. Under this usage, groove of the burrs will be clogged with coffee powder and beans cannot go through. Please turn the adjustment nut to counter-clockwise for at least 4 memories to loosen and give more space between inner and outer burrs.

Q.  I find the top of shaft of MSS-1B is rounded after few times of use and the handle does not fit well.

A.  Please turn the handle parallel to the table. If you move the handle unstably that being slightly offed to upwards and downwards while grinding, shaft can be shaved.


Q. My Buono Kettle gets corrosion. How can I clean it?

A.  Please use a sponge or scrubbing brush with compound cream. Following environments can cause corrosion; Leaving oil or salt remains on the surface or placing the kettle close to other rusty steel/ aluminum products.


Q. VST-2000B, the display says "CAL". how can I remove it?

A.  Please remove the battery once and place it again to reset the mode.

Q. VST-2000B, the dis play says "UNST". What is this?

A.  It means "unstable". Please use it at a flat place.

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Tea related questions

Cold brewed tea

Q. About MD-5BL/MD-10BL/MDD-10BL, where do I put the tea leaves?

A.  Put the tea leaves directly into the pot. The strainer is attached to the lid and will catch the tea leaves when pouring. The tea leaves have a chance to open up in a wide space allowing the flavors of the tea to be fully extracted.

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Glass related questions

Q. What do you mean by thermal shock resistance?

A.  Hario’s microwave oven safe glass has a thermal shock resistance of over 120℃
This does not mean that the glass can resist heat over 120℃
It means that when the starting temperature of the glass and when the glass is rapidly heated or cooled and the temperature difference is within 120℃the glass will not break.

For example, if you boiled water in the glass using a microwave and then immediately immersed it into cold water the glass will not break since the temperature difference is within 120℃
However, when heat resistant glass has been heated in an oven and is held with a damp cloth or water drops fall on certain areas the temperature difference may exceed 120℃and should be handled with care.

Q. The glass broke even though it was heatproof.

A.  Heatproof glass is strong against heat and is not reinforced glass.
Heatproof glass is not shock resistant and should be handled with care.

Q. Can I put the glass into the dishwasher?

A.  Yes, Hario heatproof glass is dishwasher-safe. As for other parts please refer to the instruction manual for details on how to handle and care for them. Please also refer to your dishwasher instruction manual as well.

Q. Why does Bumping / Explosive Boil occur?

A.  When water does not boil (bubbles don’t arise) even after reaching its boiling point (100℃, we call this state superheated.
When superheated water is disturbed by a sudden shock (shaking, stirring, etc.) it triggers a sudden mass release of water close to 100℃ We call this bumping.

  Boiling water will spray out and is extremely dangerous. If it is taking the water to boil longer than usual, stop boiling the water immediately. Do not disturb the pot and leave it as it is. The pot can be moved once the water has cooled.

*Bumping can occur with stainless pots and other pots that do not conduct a lot of heat (pots that retain heat). It can also occur using a microwave and not just an open heat source.

  To avoid superheated water is to set it up so bubbles can form easily.
For example, put a wooden chopstick or piece of wood in with the water.
Use a utensil (spoon, chopstick, etc) to stir the water when boiling water.

Q. There is a shiny fleck in the water inside the glass. What is it? Is it harmful to the body?

A.  It is the same flecks that can be seen inside a thermos. They are mineral deposits.
Magnesium and calcium in the water react near the surface of the glass and become ion crystals and create deposits which look shiny.
These deposits are minerals and are not harmful to the body if ingested.

For cleaning the glass we recommend using a diluted (10 times the amount of soap) citric acid based soap or vinegar. Pour it into the glass container and leave for over an hour and then rinse well using something that will not scratch the surface of the glass.
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Other parts related questions

Q.Are plastic parts of the HARIO's products Bisphenol A (BPA)-free?

A.  Our goods do not contain any harmful chemicals. Any materials containing BPA which is one of endocrine disruptors are not used. Especially, we as a company policy prohibit the use of polycarbonate whose codes and standards are strictly limited by Food Sanitation Act in Japan.
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Other questions


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