Thermal Fluid Systems Thermal Fluid / Hot Oil / Thermal Liquid Heating Systems

Thermal Fluid Systems is a complete system supplier of thermal fluid heaters and hot oil systems including heating, cooling, pumps, valves, tanks, heat exchangers, economizers, stacks and associated equipment.

Since 1994 Thermal Fluid Systems has specialized in the sale and service of thermal fluid ("hot oil") heating systems for the process industry. Our scope of supply ranges from the heater alone through to complete turnkey installations. We also provide ancillary equipment including thermal fluid pumps, thermal fluid valves, tanks, filter systems, stacks, economizers and heat exchangers.


A thermal fluid system, also known as a hot oil, thermal liquid (or sometimes Dowtherm) system, is an industrial heating system wherein a special heat transfer liquid is recirculated by a pump through a fired heat exchanger where its temperature is raised for use in heating various processes.


Usually in the range from 200°F to 750°F, typical applications include:

  • Heating press platens such as OSB and plywood presses, laminating presses, rubber and plastic molding presses and circuit board presses
  • Heating calender and drying rolls such as for non-wovens and papermaking felts
  • Heating chemical, petrochemical and other process equipment such as reactors, heat exchangers, dryers and evaporators


We can supply systems fired by natural gas or any liquid fuel, electric thermal fluid systems and in special cases thermal fluid systems fired by solid fuels such as wood waste or coal.

Systems range in size from electric thermal fluid systems as small as 100kW to over 1MW, with gas or oil fired thermal fluid systems from 500,000Btu/hr to 100+ million Btu/hr and solid fuel thermal fluid systems from 10 million to 150+ million Btu/hr.


The main advantage is that the systems run at a very low pressure, typically just the pressure required to pump the liquid around the system. When designed correctly they reliably and efficiently produce high temperature heat. They are simple to maintain with only the burner and pump needing regular maintenance. Our experience in system design and crucial component selection ensures low maintenance.

We use high temperature air-cooled centrifugal pumps with a mechanical seal and bellows-sealed isolation and control valves to ensure this. Other benefits include no danger of damage due to freezing when the plant is shut down, no corrosion, accurate temperature control and high efficiency.


Drawing on our own extensive experience and with the engineering backing of German technology companies who have been building and supplying thermal fluid systems for over 40 years, we can supply a system that exactly meets your process requirements for thermal fluid flow, temperature and capacity. We service what we sell and can provide on site technical service and support, replacement parts from our extensive inventory and system and control upgrades.


We have recently developed a thermal fluid sidestream filter system that uses special high temperature glass fiber wound depth cartridges, capable of removing particles down to 10 microns! Units are available with and without pump and size matched to your system.

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Press Release

Thermal Fluid Systems Releases White Paper

Thermal Fluid Systems has released a free white paper on Chemicals-technology.

White Papers

Process Heating Systems: Gas and Oil Fired

Thermal fluid heating ('hot oil') systems provide high efficiency and low pressure operations for temperatures as high as 700°F.

Thermal Fluid Systems, Inc.

3046 Matlock Drive

Kennesaw GA 30144


United States of America

+1 770 425 5556 +1 770 425 9559

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Press Release

3rd February 2014

Thermal Fluid Systems has released a free white paper on Chemicals-technology.

Read more

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Thermal Fluid Systems, Inc.

3046 Matlock Drive

Kennesaw GA 30144


United States of America

+1 770 425 5556 +1 770 425 9559

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