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Indirect Fired Heaters

an indirect fired heater manufactured by Sigmal Thermal


Inproheat Industries offers indirect fired heaters manufactured by Sigma Thermal.

Indirect fired heaters – commonly referred to as process bath heaters – are used for the indirect heating of liquid or gas processes. This is most commonly done by sending a coil into a solution that has been heated as a bath using an inner burner tube.  

The three main types of indirect fired heaters are as follows:

Water bath process heaters commonly use water-glycol as a bath solution with a maximum temperature range of up to 250F. 

Salt bath process heaters offer more elevated temperature capabilities than water bath process heaters and can be run for longer stretches of time. 

Weir bath process heaters operate without process coils. Instead, process fluid is heated directly with a connected weir and fire-tube before leaving the heater.


Customized Manufacturing and Installation

Indirect fired heaters can be customized at the design process to match the needs of the installation.

Burner Options

Indirect fired heaters can contain burners built for specific emissions and low NOX regulations. In areas with reduced access to electricity, draft burners are available.

Automation Capabilities

Indirect fired heaters offer automation options for further efficiency.


Indirect fired heaters are most commonly used in industries such as oil and gas, with specific applications like natural gas projects and the heating of crude oil.


Sigma Thermal