A small electric coaster that keeps a regular ceramic mug warm at your desk. Cheap, effective, and the answer if your coffee always goes cold halfway through.
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Frequently asked questions
Are mug warmers safe to leave on?
Most have auto-shutoff. Read the manual; for safety, treat them like any countertop appliance and don't leave them on overnight.
Do mug warmers work on insulated mugs?
No. The insulation is the whole point - warmers heat the bottom and the heat won't transfer through the vacuum gap.