How to Make Tea in a Thermos Flask?

how to make tea in a thermos flask

​You have probably encountered this problem before: you prepare some tea and store it in a vacuum flask only to find out that it has a strange taste after a couple of hours.

This is often the case when you store white tea in a thermos flask and it has nothing to do with the condition of the milk or any other ingredient of your tea for that matter. On the contrary, it has everything to do with your preparation method/procedure.

The preparation process is very important if you want to succeed in making tea in a thermos flask. In this article, we are going to share on how you can make tea in a thermos flask using a simple process that guarantees success. However if you still need to buy one, check out our reviews on the best thermos flask here

​Know the Ingredients

If your tea prepared in a thermos flask turns out different from the way you expected it, the chances are that you used ingredients that reacted negatively with the thermos flask.

It is a very common occurrence for the thermos flask to react badly with ingredients like cinnamon, garlic, or ginger and these are additives that most people use in their tea either directly or indirectly. However, this should be an issue of concern because high quality thermos flasks are made of materials that are friendly to all these ingredients.

tea ingredients1

​This implies that if you are using a substandard thermos flask, or one that you have been using for a long time, then the likely reason for the strange tasting tea could be a faulty thermos flask and a replacement would solve the problem.

​Is It White or Black Tea?

Is it white or Black Tea

​​Making black tea in a thermos flask is a very straight-forward process. All you have to do is put the tea bag in to the thermos flask and then add hot water. Also, depending on your preference, you can add sugar at this point and then allow it to mix by itself or swirl it for approximately 30 seconds. It is recommended to always use very hot water. This way, you eliminate the need to swirl the thermos flask for the tea to mix completely. It is also advisable for you to do the mixing in a separate cup before transferring it into the flask.

Making white tea in a thermos flask can be a challenging endeavor if you do not have a separate cup. However, you do not have to worry if you can confirm that the ingredients are not reactive to the thermos flask. Alternatively, you can boil water in a pan or electric kettle and transfer it into the flask followed by the milk and the tea bag. At this point, you can also add your desired amount of sugar and allow it to mix for a couple of minutes.
Following this procedure to make white tea can help you to avoid a strange-tasting cup of tea. Just ensure that you have used the correct ingredients and in the right amounts.
Using a properly cleaned thermos flask can go a long way in ensuring that the tea kept in a thermos flask is safe for consumption. Sometimes it is the dirt and other foreign residue in the thermos flask that causes it have a strange taste. It is, therefore, important that you clean the thermos flask thoroughly to make sure it is clean and dry, ready for the next use. Avoid leaving the tea in the flask for a very long time. More often than not, tea left in a thermos flask for an extended period will tend to have a strange taste. This can be easily avoided if you just shortened the time interval between when you prepared the tea and when you intend to drink it.


​Knowing the type if thermos flask you are using as well as the ingredients of the tea will go a long way in helping you to successfully make tea in a thermos flask. The next time you embark on a tea-making endeavor using a thermos flask, that ensure you can confirm the condition of the flask and the ingredients of the tea you intend to make. Once you have observed the above measures, nothing can stand in the way of you enjoying your nice and tasty cup of tea.

About the Author Harry Thompson

Gaining a BSc Honours in building/ property maintenance at the University of Portsmouth Harry went into the field of renovating properties. Along the journey, he has developed a wide variety of home & garden DIY skills such as installing new kitchens and landscaping gardens.