Ember Smart Mug 2 Review
Coffee that's still hot on sip number twelve, not just sip number one.
The Ember Smart Mug 2 is a 10 oz heated mug that holds your drink between 120°F and 145°F for up to 90 minutes off the coaster, or indefinitely while sitting on it. It’s built for people who make a coffee, get pulled into a Slack thread or a Zoom call, and come back to find it lukewarm — which is to say, almost everyone who works from a desk.
- 90 minutes of true portability Off the charging coaster, the mug holds set temperature for up to 90 minutes — enough for most meetings, but not an all-morning solution without the coaster nearby.
- Works with or without the app Pair it with the Ember app for precise 1-degree temperature control and empty-mug alerts, or skip the app entirely and it defaults to a steady 135°F, remembering your last setting.
- Smart enough to manage itself Built-in motion and liquid sensors wake the mug when you pour in hot coffee and put it to sleep when it’s been sitting untouched, so you’re not babysitting a power button.
- Hand-wash only, no dishwasher The scratch-resistant interior is fully submersible to 1 meter but must be hand washed — a real daily-maintenance tradeoff for a $130+ mug.
App-set temperature (120-145°F) keeps your coffee at exact sip-ready heat for up to 90 minutes at your desk, with auto sleep/wake so it never runs needlessly.
| Capacity | 10 oz |
| Temperature Range | 120°F to 145°F |
| Battery Life (off coaster) | Up to 90 minutes |
| Battery Life (on coaster) | All-day, continuous |
| Default Temp (no app) | 135°F |
| App Control | Ember app — iOS/Android, precise temp + notifications |
| Water Resistance | Fully submersible up to 1 meter |
| Cleaning | Hand wash only, scratch-resistant coating |
| Sensors | Auto wake on hot liquid pour, auto sleep on motion/inactivity |
| Status Indicator | Smart LED — lights when drink reaches set temperature |
- Holds a precise temperature (120°F–145°F) instead of just generically ‘warm,’ so you can actually dial in how hot you like your coffee
- Auto sleep and hot-liquid wake sensors mean you never have to press a button mid-workday
- Fully functional without the app — defaults to 135°F and remembers your last setting, so it’s not a smart-home gadget that breaks when your phone dies
- LED indicator gives a clear visual cue for ‘ready to drink’ instead of guessing by touch
- All-day warmth on the coaster makes it a genuine desk-stay appliance, not just a 90-minute novelty
- 90-minute battery life off the coaster means it’s not useful for a full day away from your desk — a camping trip or long commute will outlast it
- Hand wash only, no dishwasher, which is one more small chore added to a daily coffee ritual
- 10 oz capacity is on the small side if you’re used to a 16 oz travel mug or a big morning pour
Choosing the right smart heated mug
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Battery life away from the chargerHighHeated mugs are only as useful as how long they hold temperature once unplugged. A mug that dies in 30 minutes defeats the purpose for anyone who leaves their desk.Look forAt least 60-90 minutes of off-coaster runtime, like the Ember Mug 2's stated 90 minutesAvoidMugs that only state 'charging time' without a clear standalone battery spec
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App dependency vs. standalone functionHighSmart mugs that require an app for basic operation are fragile — if the app breaks or your phone's not handy, the mug becomes useless.Look forA mug with a sensible default temperature and memory function that works without any app, like Ember's 135°F fallbackAvoidMugs that need Bluetooth pairing every single use just to turn on
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Cleaning requirementsMediumElectronics inside a drinking vessel usually limit how it can be washed. This is a real maintenance cost you'll face daily, not a one-time spec.Look forClear water-resistance rating (submersible to a stated depth) and hand-wash instructions you're actually willing to followAvoidVague cleaning claims with no submersion rating, which usually means limited rinsing only
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Capacity matched to your drink sizeMediumHeated mugs come in a range of sizes, and a mismatch means either reheating a near-empty mug or not fitting your usual pour.Look forA capacity (e.g., 10 oz) that matches your typical cup size, not your travel-mug sizeAvoidAssuming all 'coffee mug' capacities are interchangeable with to-go cup sizes
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Automatic sensing vs. manual controlsLowMugs with auto-wake and auto-sleep sensors are more pleasant daily to use than ones requiring a physical button for every pour.Look forMotion and liquid-detection sensors that start/stop heating automatically, like Ember's auto sleep and wake-on-pourAvoidManual-only power switches that you'll forget to turn off, draining the battery overnight
Common questions
Do I need the Ember app to use the Smart Mug 2?
No. Without the app, the mug defaults to 135°F and remembers your last manual setting, so it works as a standalone heated mug. The app is only needed if you want precise temperature control between 120°F and 145°F or want empty-mug and temperature-reached notifications.
How long does the mug stay hot off the charging coaster?
Up to 90 minutes away from the coaster at your set temperature. On the coaster, it holds heat all day since it’s continuously powered. If you’re stepping away from your desk for longer than 90 minutes, bring the coaster or plan on a reheat.
Can I put the Ember Mug 2 in the dishwasher?
No — it’s hand wash only. It is fully submersible up to 1 meter of water, so you can rinse and wash it thoroughly by hand, but dishwasher heat and jets aren’t compatible with the internal electronics and the scratch-resistant coating.
How does the mug know when to turn on or off?
It has built-in sensors that detect when hot liquid is poured in, which wakes it automatically, and motion detection that puts it to sleep when it senses the mug has been sitting untouched for a while. You don’t need to press a button for either action in normal use.
The Ember Smart Mug 2 does exactly what it claims: it keeps a 10 oz drink at a dialed-in temperature for up to 90 minutes untethered, and all day on the coaster, with sensors smart enough that you mostly forget it’s a gadget at all. The real-world tradeoffs — hand-wash-only cleaning and a battery window that won’t survive a full day off-desk — are worth knowing going in, but for anyone who actually works at a desk and drinks coffee slowly, it earns its price.
- Precise 120°F–145°F temperature control, with a no-app fallback at 135°F so it's never a dead brick
- Auto wake-on-pour and auto-sleep sensors handle the on/off logic without any manual input
- 90 minutes of standalone battery plus all-day heat on the coaster covers the vast majority of desk-bound coffee sessions
If you’re the person whose coffee always goes cold by the time you actually get to drink it, the Ember Smart Mug 2 solves that specific problem better than any lid, cozy, or microwave trip. It’s a desk tool first, a travel mug a distant second — buy it for where you work, not where you commute.