I just filled my new glass with hot water and it shuttered. I used it a few times with a mug warmer. I wonder if two items are compatible.
2043558
I'm sorry to hear what happen but I've never encountered that too happen & I put mine in microwave for 2 minutes. If you experience that with a mug warmer I would think that is direct heat & the temp maybe too high for this glass. The instructions from Teavanna dishwasher & microwave safe. Good luck too you.
1137017
I had a similar one (same brand) snap off in a freeze...I forgot to turn the water off and disconnect it. Otherwise, no problems.
388606
It's an insulated tumbler - so I am not sure if using a cup "warmer" would be a very efficient way to keep a beverage warm - that being said - it is a plastic cup and if the warmer gets very hot - may damage the cup...
739853
I did not have the same experience, but it may be due to being thrown in the dishwasher. I do not know if you did so or not, but that is what ended my thermos in the end.
888405
Sorry, I have the same issue and didn't know what to do, so I glued the one cup that had cracked at the top seam...which kept the liquid out of the inside gap...other than that, they keep things hot longer, so I keep it with the cracks and all.
2140837
I have not, but that will happen to glass when put away while still hot. Items expand when they've been heated then contract when they cool.
1251899
I didn't try warm beverage. I tried it with cold water/juice and it holds cold temperature for hours.
124301
It just pulls out. At least mine did. Try running hot water over the plastic for a minute or 2 to get it to expand a bit then turn the unit upside down, lightly tap the bottom a couple times, hold the glass in one hand & pull up on the plastic (while twisting) with the other hand. Dont force it tho!!!!! Its glass & can break. But this worked for both of mine.
505109
No, it won't. It's only a warmer, meant to hold the temperature of the liquid that is already hot. Even at that, if you don't immediately put the filled cup on the PRE-HEATED warmer, it will go cold in little time. A possible solution: as soon as the coffee is ready, pour half in the cup you'll use right away and the other half cup on the warmer. When I did that, the coffee stayed quite hot and didn't cool. It probably seems a bit of a hassle when traveling, though. Good luck.
2281449
I would say something is definitely wrong. This has never happened to our mug warmers (we have 2 of them) in all the years that we've had them. I'd return it immediately!
1792049
In my experience, (I tried both warm water, then hot) the heat element does not work at all.
309657
I just tested one in the microwave, having filled the mug near to the top. I used the "beverage" button and found the liquid hot and the handle cool. Previously, I'd just poured freshly brewed coffee into the mug with good result - handle stayed cool, no damage to the glass.
1513962
Ice will not, the sipper is very narrow like a sippee cup. Takes a little getting used to but the always hot coffee is worth it!
1406410
Be sure the water cap is completely closed. When I first purchased mine, I realized once that I had not completely closed it so that it "snapped."
547288
Mine cracked, but it was my own fault. I poored cold water into it after it was heated up too long :-(
1028042
Based on descriptive data from the Lifefactory website, I wouldn't recommend it. While there is probably no danger of the glass cracking with hot water, it's designed for cold drink use.
1643499
Absolutely not. The exterior stays cool even with boiling water. Hot drinks stay that way for longer than with a ceramic mug though, so be aware of that.