How to Heat a Cup of Cold Coffee Without Burning It

You’re in the middle of a busy afternoon, coffee in hand—but work piles up and your freshly brewed cup goes cold. You don’t want to waste it, but reheating coffee in the microwave often leads to uneven temperatures or boil-overs. Is there a better way?

Yes. The MIITO device can reheat your coffee—or any other liquid—in under two minutes, right in your cup, without boiling over or wasting energy. It works in most non-iron containers and heats just the amount you need.

What is MIITO and How Does It Work?

MIITO is a small kitchen appliance made of two parts: a plug-in base and a heating rod with a 45mm disc at the bottom. To use it, place your cup or container on the base and insert the rod into the liquid. The base sends electromagnetic energy via resonance to the disc, which transfers heat through the stainless steel rod to the liquid around it—just like wireless charging. This means you can heat coffee, tea, soup, or even cookable liquids like oatmeal or milk directly in your mug, bowl, or teapot.

Why Heating Coffee the Usual Way Can Be Problematic

Most people resort to microwaves or standard electric kettles to reheat coffee. But microwaves often heat unevenly or cause spills when the liquid boils over. Kettles waste energy by boiling more water than needed. MIITO solves both issues: it only heats the liquid you’re drinking, in the vessel you’re already using, and stops automatically once it reaches boiling point—or whenever you remove the rod.

It’s also faster and safer than a stovetop kettle or the traditional microwave approach. The design encourages minimal energy use, heating only what you need—making it far more efficient than boiling a full kettle just to warm a single cup.

How Long Does MIITO Take to Heat Your Drink?

Heating time depends on the container and the amount of liquid:

• A 200ml glass cup takes about 1 minute
• A 500ml ceramic teapot takes around 2.5 minutes

The rod heats through induction, so results vary slightly based on the container’s material and base thickness. It works efficiently with most non-iron containers such as glass, ceramic, and some plastics. You can also use it to boil water as needed—just enough for one cup—directly in your travel mug or teapot.

The Story Behind MIITO

MIITO began as a graduation project by Dutch designers Nils Chudy and Jasmina Grase. Inspired by sustainability expert Leyla Acaroglu’s TED Talk about the global waste of energy from overfilling kettles, they envisioned a smarter, less wasteful solution for boiling only the liquid you actually need.

After refining their prototype, they founded MIITO and set up their company in Berlin. Their innovative design gained attention, leading to a showcase at the London Design Museum. They launched a Kickstarter campaign in May 2015 to fund production. The campaign was massively successful: it hit its €150,000 goal in just 38 hours, and ultimately raised over €270,000 from 2,391 backers—with all early bird rewards sold out.

The design team documented the entire journey from concept to working prototype on Tumblr, offering a behind-the-scenes look at how MIITO evolved from school project to Kickstarter success.

Frequently Asked Questions

Can MIITO be used to reheat coffee in any mug?

MIITO works with most non-iron containers such as glass, ceramic, and some types of plastic or metal mugs that have a flat, non-metal base. It cannot be used with containers made entirely of iron or steel, as those materials block the electromagnetic induction needed for heating.

How long does it take to reheat 200ml of coffee?

Heating 200ml of liquid in a standard glass cup typically takes about 1 minute using MIITO. Actual time may vary slightly depending on the container’s material and base thickness.

Does MIITO boil the liquid or just heat it?

MIITO will bring your liquid to a boil if left in long enough. However, it is designed to heat your drink to a drinkable temperature, and you can remove the heating rod at any time once the desired warmth is reached—so it doesn't have to reach boiling unless you want it to.

Is MIITO safe to use on my office desk?

Yes. MIITO is designed for desktop use and stops heating automatically when the liquid boils or the rod is removed. It is safer than a microwave (which can boil over) or a kettle (which requires a separate appliance and more energy). Just make sure the surface under the base is heat-resistant and stable.

What kinds of drinks can you heat with MIITO?

In addition to coffee and tea, you can heat any liquid, including chocolate, milk, soup, or even cookable foods like instant oats. It functions similarly to a small induction heater and works best in vessels suited for those liquids.

Recommended FrontStreet Beans for Warmed Coffee

When reheating coffee, flavor stability matters. FrontStreet’s Ethiopia Humbera offers bright berry and floral notes that hold up well even when gently warmed. For something richer, try the Yirgacheffe—its citrus and stone fruit tones remain vibrant. Alternatively, the Classic Blend provides a balanced profile of chocolate and nuts, ideal for a reheated office cup. All three are freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.