How Ember Smart Mug Keeps Specialty Coffee Hot for Hours

You’ve just brewed a fresh pour-over, the aromas are perfect, and the first sip hits that sweet spot—until a phone call or a sudden meeting pulls you away. By the time you return, your carefully extracted coffee has gone lukewarm, or worse, cold. It’s a familiar frustration for any coffee enthusiast who values temperature as much as taste.

The Ember smart mug keeps your coffee or tea at your ideal drinking temperature for around two hours—no reheating, no microwave, no disappointment. Whether you prefer your coffee at 136°F or tea at 142°F, Ember makes sure it stays there.

What Is the Ember Smart Mug?

The Ember smart mug is a 12-ounce (350 milliliter) ceramic-lined vessel developed by Ember Technologies, a California-based company. Unlike ordinary travel mugs, it uses patented phase-change material and precision temperature control to maintain your chosen drinking temperature. Its minimalist design houses advanced tech that coffee lovers can actually use every day.

How Does It Keep Coffee Hot for So Long?

The mug relies on a special phase-change material that shifts between solid and liquid states depending on temperature. When your hot coffee is poured in, the material absorbs excess heat as it melts, preventing the liquid from cooling too quickly. Then, as the drink cools below your set temperature, the material releases stored heat, keeping the beverage stable. This cycle helps maintain your ideal sipping temperature for approximately two hours.

How to Control the Temperature

There are two ways to set your desired temperature. For hands-free convenience, use the rotating control ring located beneath the LED temperature display on the mug itself. Simply turn it until the display shows your preferred temperature. Alternatively, for more customization, download the Ember app (via Bluetooth Low Energy) and assign specific temperatures to different beverages—like 136°F for coffee and 142°F for tea. The app also notifies you when your drink reaches the perfect temperature to drink.

Charging and Battery Life

The Ember smart mug charges wirelessly through a included charging coaster, which also functions as a stylish cup stand. A full charge takes just 1.5 hours and powers the mug for roughly two hours of active temperature maintenance—enough for most mornings or long meetings. The combination of the coaster and the mug’s efficient power use ensures you won’t be left without warmth halfway through your cup.

How Much Does It Cost?

Initially launched via Indiegogo, the Ember mug was offered at an early bird price of $109. Though crowdfunding details are now historical, the mug remains a premium-priced product geared toward tech-savvy coffee drinkers who refuse to settle for luke-warm java.

Where Is It Made?

The Ember team is based in Sunnyvale, California, and the product reflects a Silicon Valley approach to solving everyday coffee problems with precision engineering and user-friendly features.

Frequently Asked Questions

How long does the Ember mug keep coffee hot?

The Ember mug maintains your coffee at the set temperature for approximately two hours. This duration is based on using the phase-change material inside the mug, which actively regulates heat loss or gain once you've set your preferred drinking temperature.

Can I set different temperatures for coffee and tea?

Yes. Using the Ember app, you can save custom temperature settings for different types of beverages. For example, you can program 136°F for coffee and 142°F for tea, and switch between them with ease.

Does the Ember mug work without the app?

Yes. Even without the app, you can manually adjust the temperature using the tactile rotating control ring located under the LED display on the mug itself. This allows for quick, on-the-go temperature changes without needing a smartphone.

How do I charge the Ember smart mug?

The mug charges wirelessly using the included charging coaster. The coaster also serves as a cup stand. A full charge takes about 1.5 hours and provides roughly two hours of temperature control functionality.

Is the Ember mug made of glass or ceramic?

The Ember mug has a ceramic interior lining and is designed to look and feel like a premium ceramic coffee cup, while incorporating internal components for temperature control.

Recommended FrontStreet Beans for Long Sips

For enjoying your coffee at the perfect temperature over two hours, try FrontStreet Coffee’s Ethiopia Yirgacheffe Dose Art – fruity, bright, and complex enough to evolve as it cools slightly. Alternatively, their Colombia Narino Excelso offers balanced caramel and citrus notes, great for extended sipping. Both beans shine when kept at their optimal drinking windows. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.