COSORI Coffee Mug Warmer for Desk, Digital Cup Heater, Coffee & Christmas Gifts, 1°F Precise Temperature Control, Touch Tech & LCD Digital Display (77-194℉), 304 Stainless Steel

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.

I absolutely love the COSORI Coffee Mug Warmer! As someone who spends a lot of time working at my desk, this warmer has been a game-changer. The precise temperature control (ranging from 77°F to 194°F) is spot on, and the ability to set my ideal temperature with such accuracy has been fantastic. Whether I want my coffee to stay piping hot or just warm enough to enjoy over an extended period, this mug warmer can handle it.The LCD digital display is super easy to read and allows me to quickly adjust the settings with just a touch of a button. The 304 stainless steel design feels durable and modern, making it a nice addition to my desk setup. I also love the touch tech—it’s responsive and makes adjusting the temperature a breeze.It’s been great for keeping my coffee, tea, or even hot chocolate warm throughout the day, especially on those busy mornings when I get sidetracked and forget about my drink. No more cold coffee! Plus, it makes a perfect Christmas or coffee lover’s gift—I’ve already recommended it to several friends.Overall, this COSORI Coffee Mug Warmer has exceeded my expectations. It’s reliable, effective, and stylish. If you’re looking for a way to keep your drinks warm throughout the day, I highly recommend this product!

This warming plate is very handy. I use it to keep cups and plates warm.The first thing I did was turn it on to the maximum setting of 194°F and placed a cup of room temperature water on it to see what it could do. With a silicone lid on top of a flat-bottom glass cup, the mug warmer read 177°F after a couple hours. I watched the temperature rise to 160°F quickly, then it started to plateau at 177°F. The water inside the cup was about 15-20°F cooler. That said, the water did start to bubble as per picture. A sign that is already too hot to drink.The mug warmer also has a few other features:Ability to enable and disable the gravity induction switchOption to convert the temperature from Celsius to Fahrenheit and vice versaOption to turn on/off soundsPros:- Adjustable temperature range from 77°F to 194°F.- Thin and compact design. It doesn’t take up much space and can still accommodate a plate on top.- Ability to turn the gravity switch on or off, control sound, and switch between temperature units.- It keeps liquids warm, or hotter than warmCons:- Heats up to 160°F quickly, but going past that is a slow crawl, reaching 177°F. It’s unclear how much longer it would take to reach 194°F.- No preset temperatures. You have to press or hold down buttons to reach the desired temperature. However, it does remember your last used setting.- Temperature can be hard to read at certain angles and light settings.- Price is a bit high- Temperature buttons are sensitive to glass plates on top i.e. the plate on top can change my settings (I know, this is a cup warmer and not a plate warmer.)

Got this to keep my sourdough starter warm, as it’s way too cold in my house this deep in winter and it’s working GREAT. I set it to 94 degrees and Breadward Cullen stays at a steady 75, allowing him to thrive in the freezing New York winter. It stays on super long does auto shut off after a while, so keep an eye on it but definitely recommend for this trying to create or maintain a starter in cold weather!! It’s way cheaper and smaller than a proofing box.