Review on ☕ 25W Mug Warmer: Quick Heating Coffee Warmer for Office Desk with Temperature Control and Auto Off - Perfect for Cocoa, Tea, Water, Milk and More! by Owen Phi

Addendum: This product is not certified under the National Electrical Code. That means: It is not UL listed, not CSA certified and not approved by the European Union. The presence of a tested product shows that the device conforms to a generally recognized safety standard. Also, I've found that the OFF switch only temporarily disables the heater pad circuit. The tile remains live despite the switch being operated. So when you put the mug (or any weight) back on the plate, the heater will turn on by itself. For this reason, ie for security reasons, I installed the "Inline LampCord Switch". A flat-bottomed mug such as the KRIPT Flat Bottom Ceramic Mug with Aluminum Plate (available from Revain) is highly recommended. This is one of the few heaters that has a maximum temperature of 167 F at the source. Efficient heat transfer from the heating plate to the contents of the cup guarantees direct contact between the heating element and the cup. The surface temperature of the heater, measured with a non-contact IR device, showed 220+ F. This thing is HOT. The rest depends on the type of mug you are using. The package came in a sealed box; completely new. Worked as advertised and described in accompanying literature. Note: The lower the content (when drinking coffee), the warmer the content of the liquid. As an extra precaution, I can use a built-in power switch to turn off the power completely when I leave my upstairs bedroom.