This warmer carts adopts the heated air convection system. It can heat up the food through the hot air produced by the fan drive. This kind of heating-up system is characterized with fast heating-up and even temperature. A water bowl is placed underneath the appliance, keeping the food at certain humidity level through natural vaporization. Also this appliance is furnished with a thermostat and thermometer. The appliance is equipped with a mobile carriage. It can be installed in the shopping malls, super markets or other food-servicing locations.