RJE Coffee heater

RJE Coffee heater is a small desktop warmer for keeping a mug from going cold while you work, not a machine for brewing anything. By our assessment, its appeal is the simple job itself: park the cup on the plate and let heat do the dull part of the morning. The trade-off is just as plain, because it only helps with one cup and one task, and it depends on the cup actually sitting flat enough to pick up heat. In practice this kind of thing lives on a desk and asks for little more than a plugged-in outlet and some patience. It sits in the same narrow lane as other mug warmers rather than kettles or coffee machines, and that is exactly where it makes sense. People who want a hotter drink without getting up will get the point; people who want real brewing will not.