I like the look and design. Unfortunately I haven't seen it work at the advertised temperature of up to 52 degrees Celsius, but I'll have to try it with different cups to find the perfect shape and material to keep the heat off the plate, but the Insulate heat from exiting the top and sides. In my image, I've included temperature drops at random intervals over the 2 hours I tested. The temperature dropped from 80°C to 40°C in the first 1.5 hours and then held 40°C for half an hour, so I have no doubt that it will hold 40°C, just not sure if it does is the ideal drink for coffee and tea. It's not my ideal, but it's better than microwaving a mug 5 times or using my vacuum mug and removing the lid and hand washing each part each time. I've compared the temperature to tea brewed in a heat sealer at the same time and it held up much better, but I also think I drink slower from a heat sealer than from a coffee mug so I'll give the try to others when in doubt mugs and update this review if I find an optimal mug shape or material, or if anything changes. I like it, I just want it a little hotter. Update: This heater definitely works better for less liquid. So yes, if you leave full coffee on it it will cool down, but if you drink it and there is less liquid in your cup to keep it warm, the temperature will be easier to maintain. I tried more mugs and added even more photos. A metal mug works better than a glass or ceramic mug, but not many people drink from metal mugs. I'm happy with this purchase but it saved me from going in the microwave because it's warm enough to drink.
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