Immersion heaters are used primarily to heat various types of liquid by plaving the heating element in direct contact with the liquid through immersion.

Cartiridge heaters are cylindrical heating devices placed in fitted holes or bores which transfer heat to surrounding materials.

Electric heater are electric heating devices that are designed to take electrical energy as an input sources of power and convert into heat energy.

A drum heaters also called hand heater, barrel heater, container heaters is used to reduce viscosity of liquids and gets by heating in order to fill pump or bottle the respective liquid or to prevent liquids from freezing inside the drum.