Open-tank oil temperature control unit: when to choose it?

Open-tank oil temperature control unit: when to choose it?

Not all high temperature processes require a pressurized or closed loop system. In fact, in many applications, an open tank configuration is the most efficient and reliable solution.

So when does it make sense?

When your process allows working at low pressure
Open tank systems are ideal when no pressure is needed, simplifying installation and reducing mechanical stress on components.

What needs to be taken into account?
Working with thermal oil involves managing expansion, volume variation, and fluid degradation — especially when approaching or exceeding 150°C. These factors directly impact performance and maintenance.

What if your process exceeds these limits?
For higher temperatures, greater control or more demanding conditions, it may be necessary to resort to more advanced solutions such as our SMART 6 range.

Where is it usually applied?

Plastic injection and extrusion
For molds that work above the water limits, improving part quality and process stability.

Chemical and pharmaceutical processes
Where precise and stable heating is key to control reactions, viscosity and consistency of the product.

Rubber, composites and lamination
Ensuring uniform thermal distribution and stable behavior of the material.

Die casting and metal processing
Reducing thermal stresses and extending the useful life of the molds through precise thermal control.

The real question is:

Are you using the right system for your process conditions… or just the most common one?

Because in temperature control, understanding the application is what really makes the difference.

Let's talk. We help you find the right solution for your process.

Frequently asked questions

When is an open tank oil temperature control unit suitable?

When the process works below the boiling point of the fluid and does not need pressurization. It is the simplest, most economical and reliable option in many high temperature applications. More about open deposit units.

Up to what temperature can an oil system work?

With thermal oil, MARSE systems reach up to about 300 degrees, covering processes that water cannot handle. We see it in oil at 300 degrees.

Open tank or pressurized system?

It depends on the working temperature and the margin against boiling. If this limit must be exceeded, the pressurized water or a closed circuit. Below, the open deposit usually gives the best cost-reliability ratio.

Oil or water for my process?

The choice depends on the target temperature, transfer efficiency and maintenance. This guide compares it: water or oil. And the entire range, in industrial temperature control units.