Industrial Online Preheating System is a heat recovery system consists of a recuperator which selects air and fuel ratio according to the shell and tube type. The Preheating System has a recuperator that can pre-heat the combustion air to the tune of 250° C to 300° C and preheated combustion gases are used along with the fuel as combustion fuel mixer. The Preheating System comes in robust construction and can be installed with ease. Industrial Online Preheating System is easy to maintain and can be availed in different specifications and dimensions to suit the specific requirements.