Cold coffee at ten in the morning is the tax on a slow start. You pour a fresh cup, a call runs long, a meeting eats the next hour, and the last third goes down lukewarm. Reheating it buys you five decent minutes and a cup that tastes like the microwave. A mug that heats itself skips the whole cycle, and the newest one just got a third cheaper.
Nurse a cup for an hour and you already know. Twenty good minutes, then the slow slide.
By the last third you’re drinking it out of obligation. That’s the cup a heated mug exists to rescue.
Ember’s Mug 3 in the 14-ounce size is $99.99 at Amazon, $49.96 under its $149.95 list price, and the cut lands on a generation that fixes the two things that made the older mugs fussy. You set the temperature on the mug itself now. When the cup is empty, it goes in the dishwasher instead of the sink.
Ember Mug 3, 14 oz, Black
Temperature set on the mug or in the app · Sliding lid included · Top-rack dishwasher safe
Price: $99.99 $149.95 (save $49.96, 33% off)
Where to buy: Buy on Amazon
The temperature setting moved onto the mug
Older Ember mugs made you open the app to change anything, which meant your phone had to be in the room and awake before your coffee could get hotter. Mug 3 puts a button on the mug itself, so you tap your way to a hotter or cooler cup on the spot. The app still exists for an exact degree. It just stopped being mandatory.
LEDs at the base show the setting, then the battery level while it charges. No guessing.
Inside, a built-in heater and precision sensors hold the temperature you picked. The coaster charges the battery, so the heat isn’t tied to the desk. Carry the cup to the couch, the porch, the workshop, and it stays where you set it, sip after sip, instead of drifting down to room temperature the way every ordinary mug does.
Three hours with the lid, eighty minutes without
Battery life hinges on the lid. Slide it on and one charge keeps a drink hot for over three hours. Drink the cup open and you get 80 minutes in this size.
You don’t buy the lid separately. It comes in the box, and Ember values it at $14.95 on its own. Auto sleep helps the battery too, shutting the heater down when the mug sits empty, so a forgotten cup on a side table doesn’t spend the afternoon cooking nothing.
Tea drinkers get the same benefit, maybe more, since Ember built this mug for coffee or tea at a desk or at home. A steeped cup you wander away from is usually a lost cup, because tea punishes a reheat even harder than coffee does. Held at the temperature you set, it’s still the cup you made when you come back to it an hour later, and the second steep is waiting at the right heat too.
Park it on the coaster and it never cools down
Desk drinkers will park it anyway, and parked is where it shines. On the included charging coaster the mug holds your temperature all day, topping up between sips, so a cup poured at eight is still right at eleven. Pick it up for a walk to the kitchen and the battery takes over without the coffee noticing.
Ember also warranties the coaster for life, while the mug itself carries a one-year limited warranty, a split worth knowing before a $100 mug lands in a gift box.
This one goes in the dishwasher
Cleanup is the real upgrade here. Mug 3 is top-rack dishwasher safe, and Ember’s one condition is patience. Let it dry completely before it goes back on the charger.
That wasn’t true before. When we reviewed the first Ember mug back in 2018, it was hand wash only, because the electronics inside couldn’t take the water, and every Ember since asked for the same careful sink routine. Eight years of heated mugs later, the chore is gone. The coaster and the cable still stay out of the dishwasher. Everything you actually drink from can go in.
Nine colors, three sizes, one sale
Black is the safe pick and the one linked in the boxes. Sandstone, Salt Blue, Sage Green, Powder Blue, Matcha Green, Lavender, White, and a Stainless Steel Edition all sit at the same $99.99 on Amazon right now, so the color costs nothing extra for once.
Construction is stainless steel with a ceramic-coated interior. Fourteen ounces, 414 ml. The box holds the mug, the lid, the coaster, and the cable.
Smaller pours cost less. The 10-ounce Mug 3 runs $10 less in the same sale, and the 16-ounce version, black only, is $109.99, so pick by how much coffee you actually finish rather than which one looks biggest on the counter. It’s mid-November, so the gift math counts too. A heated mug is the rare gift people use the next morning instead of shelving, and a third off list takes the sting out of giving one.
One limit worth naming. It holds hot drinks hot, and it does nothing for a cold one. Iced coffee drinkers get no help here.
Ember Mug 3, 14 oz, Black
Temperature set on the mug or in the app · Sliding lid included · Top-rack dishwasher safe
Price: $99.99 $149.95 (save $49.96, 33% off)
Where to buy: Buy on Amazon
A hundred dollars is still real money for a coffee mug. What it buys is the last sip landing at the same temperature as the first, three hours after you poured it, with a trip through the dishwasher waiting at the end of the day. If your coffee goes cold twice before lunch, it pays for itself in rescued cups and skipped microwave trips. At $149.95 that pitch is a stretch. At $99.99 it isn’t.
