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Can You Microwave A Thermos? - Is It Safe?

Modified: May 11, 2022 by Jennifer Lane · This post may contain affiliate links ·

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Stainless steel thermo bottle on wooden log with book and lid.

The short answer to this question is NO. It is not recommended to put a thermos in the microwave, as most thermoses are made with stainless steel.

If you put stainless steel in the microwave, it could cause damage to the microwave. Also, it could cause both the microwave and the thermos to catch on fire!

Thankfully, there are other ways to heat a thermos; let’s explore the options.

How To Heat A Thermos Properly:

Since it is not recommended to microwave a thermos, there is one tried and true way to heat a thermos and ensure your food or drink stays hot for hours.

Here are the steps to preheat your thermos:
Boil some water on the stove or in the microwave in a separate container.
Pour the boiling water into your clean and empty thermos until completely full.

Be careful when pouring the water into the thermos, so you do not burn yourself!

Three thermo bottles on blue background.

Place the lid on the thermos and leave it to sit for 5-10 minutes.

Remove the lid and dump out the water.

Dry the inside of the thermos quickly with a towel. Be careful when doing this as the metal inside the thermos is extremely hot!

Safely pour heated food or drink into the thermos and replace the lid.

Enjoy your hot meal or drink whenever you please!

Preheating your thermos seems to be the only way to ensure your food or drink stays hot for longer than a couple of hours.

Depending on what thermos you buy, your food or drink could stay hot, or at least very warm, for anywhere between 5 hours to 14 hours!

With these things in mind, it is safe to say the best way to heat a thermos is by preheating it with boiling water, then adding your hot food or beverage of choice.

Sources:
https://fullgreenlife.com/teenager-thermos-lunch/
https://www.yummymummyclub.ca/food/eating/20120825/how-to-keep-your-thermos-warm-until-lunchtime

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Safety Warning:

Always use extreme caution when using your microwave. Never leave a microwave unattended while in operation.  If you see sparks or hear unusual sounds coming from your microwave immediately stop the microwave.  All microwaves are different and cook with different power, adjust accordingly.  These articles are for informational purposes only and are not intended as advice.  Always consult your user manual before putting anything in your microwave.  Use your microwave oven only for its intended use as described in the instruction manual.

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