A mug warmer is about as simple as a gadget gets: a heated plate on a cable. In a cold home office in January, when a mug loses its heat faster than usual, it can save you a few trips back to the kettle.
That makes it worth having if you sit in one place for hours and you’re a slow drinker. If you wander around the house with your mug, forget it, because a warmer can only help a cup that’s sitting on it. The one I’d look at is the Accwork Mug Warmer, because it deals with the two things that annoy people about cheap warmers: a single fixed temperature, and having to remember to turn it off.
The clever bit is also the catch
A gravity sensor switches the plate on when you put a mug down and stops it when you lift the mug off. So it isn’t heating an empty plate all morning, and you don’t have to touch anything.
But the listing says the mug has to weigh at least 300g, or the display just shows two small lines and nothing heats. A dainty china cup that’s half empty might not get there. Accwork seems to know this, because there’s a switch to turn the sensor off and run it manually. Use that if you’ve got lighter mugs.
Temperature depends on your mug
You get nine settings, split into three for each material:
- Ceramic: 55°C, 65°C or 75°C
- Glass: 60°C, 70°C or 80°C
- Metal: 65°C, 75°C or 85°C
Treat those as settings, not a promise about your drink. What ends up in the mug will depend on how full it is and how cold the room is.
Auto shut-off defaults to 4 hours, and you can set it anywhere from 1 to 9. The cable is 1.5m, which should reach a desk socket without an extension lead, and the listing’s Q&A says it comes with a standard UK plug. It’ll take flat-bottomed cups up to 13cm across.
Check your mug’s base first
This is the part most people miss. Heat only transfers well where the mug actually touches the plate. Flip your favourite mug over. If it has a flat base, great. If it sits on a raised ring with a hollow middle, only that ring is in contact and it’ll warm much more slowly. A double-walled or insulated mug is even worse, since it’s designed to stop heat getting through. Don’t bother putting one of those on a warmer.
A lid or a saucer on top helps a lot too, because an open mug loses plenty of heat through the top.
What it won’t do
It holds warmth. It won’t bring a cold cup back to life in any hurry, so start with a hot drink. A tea that’s been sitting warm for an hour also won’t taste as good as a fresh one. And I wouldn’t leave a milky coffee on it all morning. Drink it, or make another.
If you’re mostly out and about, a good flask mug like the Zojirushi is the better answer. And if you get through several cups at a desk, a proper teapot with a cosy might suit you even more. For one person with one mug and a long list of emails, this is the simple fix.
