Ember Temperature Control Smart Mug 2 Review

What the Ember Mug 2 actually is

This is a 10oz (or 14oz, if you buy the larger version) ceramic mug with a battery, a heating element, and an app. You set a temperature anywhere from about 120°F to 145°F, and the mug holds your drink there for roughly an hour and a half on its own battery. Drop it on the included charging coaster and it'll hold temp indefinitely.

The point isn't to reheat cold coffee. It's to stop hot coffee from cooling in the first place. If you're the kind of person who pours a cup, gets pulled into a meeting, and comes back to lukewarm sadness, this mug solves exactly that problem and almost nothing else.

How it performs day to day

The core function works, and owners are remarkably consistent on this point. Set it to 135°F, and your coffee sits at 135°F. The mug glows, you sip, life is good. The app lets you save preset temperatures and shows battery level, though once you find your number you'll probably never open it again.

Battery life is the honest weak spot. Off the coaster, you get somewhere around 80 to 90 minutes before it gives up. That's fine for a desk where the coaster lives next to your keyboard. It's less great if you wander the house. Most people end up treating the coaster as the mug's real home and just lift it off to drink.

The 10oz size catches people off guard, too. That's a modest pour by American coffee standards. If you drink big mugs, the 14oz version exists, but it's pricier and the battery story doesn't improve much.

The good and the annoying

On the plus side: it genuinely keeps coffee hot, the ceramic feels nice, it's dishwasher-unfriendly but hand-washes easily, and it's submersible-ish for cleaning (the mug, not the coaster). The temperature accuracy is the headline feature and it earns its keep.

The annoyances are real. It's expensive for a mug, currently running somewhere in the $130 to $170 range depending on size and sales. Batteries degrade over a couple of years, and since it's sealed, a dead battery eventually means a dead mug. The app is overkill for what most people need. And if you forget to put it back on the coaster, your fancy heated mug becomes a regular mug with a worse-than-average capacity.

Who should buy it, who should skip it

Buy it if you're a slow, distracted coffee drinker chained to a desk. That's the sweet spot. It's also a genuinely good gift for the person who already has everything and reheats their coffee three times a morning.

Skip it if you down your coffee in ten minutes, if you drink large mugs, or if the idea of a battery-powered mug that eventually dies bothers you on principle. A $25 insulated tumbler keeps drinks hot longer and never needs charging. It just can't hold a precise temperature, which is the one thing the Ember does that nothing else does.

The verdict

The Ember Mug 2 is a luxury that does exactly what it claims. It's not essential, it's not cheap, and the battery limitations are baked in. But for the right desk-bound coffee drinker, it removes a small daily irritation completely, and it's hard to go back once you're used to coffee that never cools. Worth it as a treat or a gift. Hard to justify if you're being practical.

Frequently asked questions

How long does the Ember Mug 2 stay hot off the charger?

Roughly 80 to 90 minutes on a full charge for the 10oz model. On the charging coaster it stays hot indefinitely, which is why most owners keep the coaster on their desk and use it as the mug's resting spot.

Can you put the Ember Mug 2 in the dishwasher?

No. The mug is hand-wash only and the charging coaster should never go in water. The mug itself is fine to rinse and wipe, but skip the dishwasher entirely to avoid damaging the electronics.

Is the Ember Mug 2 worth the price?

If you sip coffee slowly at a desk and hate it going cold, yes. If you drink fast or want big capacity, a regular insulated tumbler does more for far less. It's a premium convenience, not a necessity.