Cosori Coffee Mug Warmer for Desk, Office, 1°F Precise Temperature Control

I bought the gravity induction version, so some of my comments apply to the gravity induction feature. I was initially confused when the item didn't turn on when I pushed the power button. Try putting a cup of coffee, tea, or soup on the heater before you push the power button. If that doesn't work make sure the heater isn't sitting on a cord or other item and is on a flat surface. This cup warmer will not turn on if there is no cup on the heating plate. Several times now the unit refused to turn on when there was a cup of coffee on the heater. In every case a power cord had worked its way under the unit, and it worked when the cord was removed. Check for that sort of thing if your warmer doesn't turn on. You can select from a large range of temperatures. Very nice. It seems the industry is using the term "gravity induction" for these items. This seems dishonest to me. It may be technically correct, but I have an induction stove, and associate the term induction with that type of technology. To me it implies you are getting some remarkable technology that you are not getting. When used for these devices it means it has a weight activated switch. When you lift the cup off of the heater the lights start blinking. It does not actually turn off immediately. When you put the cup back on the device the lights will stop blinking and heating is resumed. It will turn off if the cup is removed for a long period of time. I have not found that this is a problem. I will say that I see no purpose in the "gravity induction" feature if you can remember to turn the unit off when you are done with it; it will only be a source of problems. I don't believe it turns the heater off when you remove the cup and turns the unit on again when the cup is replaced. I believe it only turns the unit off if the cup is removed for a longer period of time. You don't really want the heater to be turned off when the cup is temporarily removed. The heater is a very low powered one. It is powered by USB after all. When the unit is first turned on you can watch the heat slowly climb up to the temperature you set. I have found two brands of cups that work well with the Cosori beverage warmer. There are advantages and disadvantages with both. The Cosori stainless steel cups are well made and look nice. I use coffee creamer and do not fill the cup clear to the top. The cup rim has not burned my lips. I believe these should be dishwasher safe. But the coffee cools very quickly when not on the warmer. I drink half a cup at a table with no warmer before going to a place where I have access to a warmer. So I consider this to be a problem. The Cosori will warm a cold cup of coffee however. The Cosori cup is a light cup and the unit will not turn on if there is only a little coffee in the cup. The gravity switch is on the bottom of the unit toward the back, so moving the cup toward the back of the heating plate helps a little. The Howay cups are a flat bottomed ceramic cup with a steel plate on the bottom. Your beverage will stay warm much longer in this cup. It is made for coffee warmers. It does have a wood handle, so I wouldn't put it in the dishwasher. Because of my habits the Howay cups work better for me. These cups are heavy enough to activate the unit when there is no coffee in the cup. Heating efficiency of these units depends on the design of the cups used. The Howay cups need a higher heater temperature than the Cosori cups to achieve the same coffee temperature. Mixing cup types means you would have to keep changing the heater temperature to achieve the beverage temperature you want. I would recommend selecting one cup type and sticking with that.

This is the best ever beverage warmer I have found!!! I have tested a few beverage warmers and let me tell you if you are like me and love to drink your coffee HOT this is the product for you!!! Do not skip this one!! It gets hot and stays not. Yes, it does take a moment to get to optimal temp but on the way, it is keeping your beverage hot. This product performs just as marketed. Thank you so very much for giving me what I expected when I purchased this. I wanted a HOT cup of coffee and that is what I had all day long. I LOVE THIS PRODUCT!! This outperformed my thermal canister. It also looks classy while sitting on my desk. I have the original one that goes to 230 degrees F. I do believe the newer one will work fine even at the lower level because this one gets so very hot and stays so very hot all day. Most people I would think would turn it down a bit. That is how hot it stays. For me, I enjoy it fresh out of the pot hot. COSORI states on the box, No Judgement. I can have my coffee Extra Hot. That is just how I like it too! Thank you COSORI! I would suggest getting the set if you do not have a flat-bottom mug. It will even warm up the other mugs but it will take a longer time. I tested the tall mug and it did get almost boiling hot after a good while. One note I do have for improvement is there should be a one-button selection to keep the desired temperature set so you are not guessing what one is set. Or you do not have to do the three taps to get to the desired temperature. I want mine to stay on the hottest one. You tend to stare and watch "paint dry" as the digits go up.

I bought this product for my home office as the temperature in my office area is usually cool/cold, and worse during the winter months. I drink a lot of coffee/tea, and am constantly having to heat up my drink, as it does not take very long to go cold if not consume in a timely manner. I like the fact I can adjust/control the temperature on this product. I’ve used it for the past two days since it arrived and I like it. It does keep my already hot beverages hot enough the way I like, but not scorching hot to where it cannot be consumed. The safety feature works great!!! It does auto shutoff as advertised, when not in use. I also note that if the mug is small/light enough it will auto shut off if the mug is empty of liquid. With Heavier mugs however it cannot detect there is no liquid and so will remain on. My next test is to place a cover on top of the mug to determine if it will remain scorching hot, just to test how hot it will remain, when covered vs. open to the cool air in my office. Overall, I am very please with this product. Coffee that would go from hot, to cool, to cold in minutes, now remain fairly hot as long as it remains on the mug warmer. I should note that My mugs are not thin mugs, and have fairly thick base. Also I keep the temp on the mug warmer set between 160 to 190 degrees as I like my drink to remain as hot as possible. I use my own mugs, not one specially design to be used with the warmer, as for me, this is the only true test to determine its usefulness. Lastly…NO, it will not heat up, or warm up liquids that is already cold, this is documented in the instruction. But, I tested it anyway just for the heck of it! I did get a 2nd one for my wife, but I have not seen her used it as yet. Guess her office area is not as cold as my own…:-) I am very pleased with this mug warmer, and will recommend it to others if asked.

Update 1.17.2026: so it broke! 😂 these mug warmers are very not water safe y'all! But! I fixed it too.i doubt my fix will last too long but I feel very handy now. I added new photos as I took this apart to see what was up, it wasn't turning off then I unplugged it and plugged it back in and it started to turn off and on all on its own? Opening it up, it was all gungy inside bc i haven't been the neatest about keeping my tea in its pot. There is NO SEAL around the front screen/panel so all the tea that spilled went right onto the circuit board. 2 of the soldered connections were eroded away, thankfully a very obvious little fix! I soldered new connections back in, added a little wire to bridge the gap, put it back together and voila! She works again 😤. Just a note, if you're gonna take this apart! There are 2 screws on the back half hidden underneath the square rubber feet! I though it was a snap in connection with the plastic housing and totally just broke one of the screw housings out. Don't be me lol. But yeah! Have the inside photos, pretty easy stuff! So my advice (I still really like this mug warmer! She keeps my teapot perfectly hot) is really be careful about keeping it dry! So far so good! I'm using it to keep my teapot warm for multiple cups and it does just that. I wanted this one bc it gets the hottest i could see and i appreciate that. Doesn't really manage to actually get to and sit at 194f though. Edit 1.4.2025 It's been about 7 months and i LOVE this thing! It's really encouraged me to drink more tea as it keeps a pot drinking hot all day if i want it. Truly the temp peaks at like 170f and mostly sits at maybe...150ish? But I'm very happy regardless.

This is a nice cup warmer, with a wide range, pretty precise temperature control, digital read out, Fahrenheit/Celsius display, and compact footprint. There is a safety feature -- a "gravity switch" -- which turns the unit off if it senses too light a weight on it -- like an empty cup. While I can see the possible usefulness of this, I found it more of an annoyance. If your cup doesn't have some serious mass to it -- and many of mine are pretty light -- the heat will shut off when your cup starts to go below half-full -- which, unfortunately, is precisely when you want to keep it warm. Fortunately, this feature can be turned off, which I did. That bit of foresight earned this product its 5th star. Having extra features is nice, IF they are under the control of the end-user. Being able to opt out of the gravity switch reveals a bit of thoughtful engineering.

I’ve tried several different brands of coffee warmers over the years and this one was by far the worst. Hands down. Not only is it finicky about turning on, you often have to push the cup down on it multiple times to get it to work, but it also wouldn’t work if the surface you put it on isn’t perfectly flat. I do mean perfectly. However, the biggest problem was the heating capability. It takes waaaay too long to get up to temperature. When I set it to the highest temp, my coffee was already lukewarm before it even finished heating up. Let me be clear when I say I mean this, I’m not exaggerating. Five minutes later and it’s still preheating. I’m not even super picky about the temperature of my coffee like my man is. But like warm on a coffee warmer isn’t acceptable. Maybe you could offset this problem by turning it on while you made your coffee to let it warm up beforehand....oh wait, you have to have the cup ON it to even power it on. Brilliant. It’s like they tried to make it impossible to find a work around to it’s issues. Every other coffee warmer I’ve tried heats up super fast so it’s not like the technology isn’t there. The only reason I got tried this one over my current favorite (nicelucky brand) is because the other brand’s only fault is the surface is smooth and the cup slides slowly if the surface isn’t perfectly level. Which isn’t a fault of the product per se, more just an issue of fulfilling a specific need of mine. We needed a coffee warmer to go on the tray area that the middle couch cushion folds down into so you can put drinks and remotes on. The surface is hard plastic but doesn’t sit perfectly level apparently. Normally you can’t tell, but when we tried to use these coffee warmers on it we noticed. I digress. I thought this one would be great because of the ability to set it to any temperature you wanted from a wide range, which would be great if it actually did it and in a reasonable time frame. This warmer doesn’t do it’s job at all. Even the old cheap Mr. Coffee warmer I used for years is so much better and that thing is super cheap, but has a small base so big mugs don’t fit it. It also doesn’t keep coffee super hot, but it’ll keep it to a decent drinkable temperature for a while. Despite all that I’d still recommend it over this product any day. Saddest part is this one was the most expensive of all the warmers I’ve tried. If you want a really good coffee warmer and a slick surface isn’t an issue then I highly recommend the one from Nicelucky brand. It is amazing quality. We use it everywhere else in the house no problem and we love it. Our coffee stays HOT for hours with that one. It’ll even heat UP your coffee if it’s less full and you don’t turn down the temp. There are three settings and it’s all you need and it heats up almost instantly. And it costs less than this one! Seriously, go check it out. TL;DR Pros: The surface isn’t slick so the coffee cup isn’t likely to slide Temp choices - great in theory. Too bad it’s about as effective as wearing a face mask to prevent global warming. Cons: Heating - terrible Time to reach temperature - terrible Easy to turn on and stay on - poor Price - high for a coffee warmer Normally I’d call something like this hot garbage, but it doesn’t get hot enough for that. Whomp. Whomp.

We have been very happy with the original model (5 stars). However in an excess of CYA, the maximum temperature of the new model was decreased from 229 degrees to 189, which is not hot enough for us regardless of the type of cup used. Also, they added a safety feature (another CYA item) which turns the unit off when no cup is present. Although this can be disabled, it involves a button on the bottom which makes the heater wobble slightly when the cup is removed and replaced. Not a big deal but nevertheless annoying.

Fav coffee warmer, heats wonderfully and equally. Great qualty.

この手の商品は初めて買いましたが買って良かったです！ お茶の抽出中の保温のほか、お菓子作りの際に使う油脂や卵などをぬくめに保つのに使ったり、チョコレートのテンパリングに使ったりもしています。 電源ケーブルが変換器内蔵のゴツいやつなのでキッチンのカウンターについてるコンセントにうまくささらなかったのだけが残念です。

Opened in great condition, no issues. Read the instructions, twice, as there are some quirky operating aspects with this unit. Its not intuitive. I fully tested all the features, and they all work correctly in accordance with the instructions. It works perfectly as per the manual. Such as, you have to have enough weight on the heating pad to make the unit work at all or to even just adjust the temperatures up or down. The cup has to be heavy enough to operate the controls. If your cup gets too light in weight as you drink, and the cup with contents weight drops below the minimum weight, the unit will stop heating. I use it for keeping my butter soft in winter. My butter dish weighs more than the minimum, so the unit will operate even if empty. Its the only unit I could find that was this small, therefore has the lowest electricity usage, therefore the lowest long term operating cost. Its the only one with a low operating temperature that you can set by 1 degree from 25C-90C. It specifically starts to operate at 25C up to almost boiling. Butter is soft at 25-29C, and starts to melt at 30-32C. If you have a small amount of butter (mass), then I can set it at 25C and the butter is soft, but not mushy, or melted. But if you add butter, 1 cup, then I need to increase the indicated temperature to 29C. to compensate for the increase of mass. It takes about 15-30 minutes to get fully soft from a cold start at 18C (morning house temperature) and it has to heat up the butter dish and ceramic top. Works perfectly. I get up in the morning to let the dog out, I turn the unit on by touching the red button on the way by to the door. Look after the dog, start coffee, start breakfast, butter is now soft enough by the time the toast pops. Perfect. Shuts off around 2pm 8 hours later. Need to turn it back on when I start working on supper. Its ready to go when I need it, soft spreadable butter. Shuts off automatically again in 8 hrs if I forget to turn it myself. If I don't use it during the weekend, its off automatically saving electricity. Perfect. Almost all the complaints I have read about this unit is due to folks not reading the instructions or following the instructions properly that they have read. I also plan to use it for keeping my bread dough bowl warm during the rise. Set for 30C. Heat my ceramic bowl with hot water, dry, grease/butter the inside, then place it on the COSORI heat element at 30C. Drop my dough into the bowl to rise. The bowl bottom matches the same size as the COSORI heat element face. Perfect. I also liked that the cord was not a full 110V cord, but a 12V cord coming from a transformer unit that I plug into the top of my stove. The wire easily tucks behind the unit , down the wall behind the stove, almost invisible while the unit is on the kitchen counter beside the toaster. If I want to unplug it, the 12v plug comes out of the back like a laptop. Wash it, clean it, wipe it easily with no cord, then plug it back in at the toaster where it sits. Perfect. I can't believe they don't market it just for this purpose. In Canada this is almost always an issue, hard butter in winter. I now don't have to wait until summer or travel south of Mobile, Alabama to have soft butter for breakfast.

Excellent product, does what it says.

Amazing quality and really thrilled with it

I bought the cup warmer for my study room to sip warm cups of tea during long Zoom calls. Although the product seemed to work it wasn't warming my tea fully. I reported my concern to Casori support and got a response and follow up emails right away. The support person Luisa, worked with me to trouble shoot the issue and when it was confirmed that the unit could be defective, she sent me a replacement unit right away. The replacement unit arrived a few days ago and it works as advertised. I can attend my 2 hour Zoom calls and my tea is warm till the last sip. For those planning to purchase it, keep in mind that it is a cup warmer and not a stove :) Thank you Casori team for your A+ support.