The heating part of this product is made of insulation material, in which the heat generating componets are enclosed,forming a new kind of heater in semicircular shape.Comparing to electric furnace, it has lots of advantages,such as the absence of open flame,fast heating,good insulation,evergy saving,high safety, easy to use etc. This product, which meets all the need of laboratory liquid heating, is a new kind of heater to preplace the open flame furnaces.Besides, the heating termperature can be adjusted, and there is distinct change in indication light while adjusting.