Dual-fuel thermal oil boiler

Why choose between two fuels when you can use both? With a dual-fuel thermal oil boiler, you can flexibly switch between two energy sources, depending on availability, price, or operational preferences.

This technology combines the reliability of a thermal oil boiler with the flexibility of a dual-fuel burner. That way, you can respond to changing market conditions without compromising on operational reliability or process continuity.

The Callens Group designs, builds, and integrates dual-fuel thermal oil installations, fully tailored to your energy supply and production process.

Discuss the possibilities

When does a thermal oil boiler with a dual-fuel burner make sense?

A dual-fuel thermal oil boiler allows you to quickly switch between two fuels, so that you can always use the most suitable energy source based on energy prices and fuel availability.

This flexibility not only brings economic benefits but also increases operational reliability when one of the two fuels is temporarily scarcer.

Reasons to choose a dual-fuel installation:

  • You want to be less dependent on a single fuel.
  • You have access to several fuels on site.
  • You want to have the flexibility to respond to energy prices.
  • You want to better protect your heat supply against supply risks.
  • You want to reduce your CO2 emissions.
Callens TO Syng 1

Power

up to 60 MW

Capacity

100,000 kcal/h to 12,500,000 kcal/h

Process temperature

up to 300 °C

Operating pressure

0,5 to 30 barg

Efficiency

95%

Technical specifications of dual-fuel thermal oil boilers

The configuration of a dual-fuel thermal oil boiler is tailored to the available fuels, the required thermal power, and the desired process temperatures.

The burner is specifically designed to safely and efficiently run on both fuels. Switching can be done manually or automatically, depending on the application and your preferred operating strategy.

Our specialists analyze these parameters and recommend the dual-fuel configuration that best suits your production process, energy infrastructure, and sustainability ambitions. This ensures reliable heat production that can flexibly respond to changing market conditions and energy prices.

BENEFITS

Benefits of a dual-fuel thermal oil boiler

In an energy market that keeps evolving, fuel flexibility offers real added value. A dual-fuel thermal oil boiler allows businesses to actively align their heat supply with the available energy streams.

More flexibility

Two fuels can be used within a single installation, without any changes to the thermal oil system.

Higher operational reliability

When one fuel is temporarily unavailable, the installation keeps running on the alternative energy source.

More control over energy costs

You can switch to the most attractive fuel based on price and availability.

Precise temperature control

The properties of thermal oil ensure stable heat transfer and a constant process temperature.

Ready for the energy transition

A dual-fuel installation makes it possible to run on conventional fuels today and add alternative fuels later.

High process temperatures

Temperatures of up to around 300 °C are possible without high system pressures.

What is the difference between a combined configuration and a dual-fuel boiler?

These terms are often used interchangeably, but they refer to different concepts.

A dual-fuel thermal oil boiler:

A dual-fuel boiler is a single thermal oil boiler with one burner that can automatically switch between two fuels, for example natural gas and biogas or natural gas and hydrogen.

A thermal oil boiler in a combined configuration:

A combined configuration consists of two or more separate thermal oil boilers, each using its own energy source and together covering the total steam demand. For example, a gas-fired thermal oil boiler can be combined with a biogas boiler, a hydrogen boiler, or an electric boiler. Each installation keeps its own function and characteristics.

Ashland Doel TO opwarmen drooglucht 2326 k W PRJ12553 19
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Maintenance of your dual-fuel thermal oil boiler and 24/7 service

The Callens Group’s maintenance and service team makes sure your installation keeps performing at its best long after commissioning. With an in-house team of more than 120 service and maintenance technicians, we schedule preventive maintenance in line with the legal and technical requirements of your installation.

You can also count on fast support whenever an unexpected breakdown occurs. Thanks to our 24/7 standby service, an extensive range of spare parts, and the expertise of our service technicians, interventions can be carried out quickly and effectively.

After all, even the best maintained installation can malfunction or shut down unexpectedly. That is why the Callens Group offers a range of service packages, tailored to the response time and support you need. So even in unforeseen situations, you are assured of the right support and maximum operational reliability.

More information about our service packages
PARTNERSHIP

Why partner with the Callens Group?

60 years of experience in EPCS projects
Independent integrator focused on customer needs
Flexible customer and project approach
Short decision-making lines and a personal approach
Unique service and maintenance support
Always close to customers with 13 locations

“Maximizing energy efficiency doesn’t start with choosing a technology, but with mapping out your specific situation.”

Projects with dual-fuel thermal oil boilers

Volvo
Thermal technology

Residual heat makes its way to the boiler room

Output2 x 12.5 MW
Operating conditions125 °C - 12 barg
<Digimax S500 / Kenox S500 / Digimax Cyber 530>
Thermal technology Hot water & industrial central heating boilers Gas-fired

Condensing central heating boilers keep transport tanks nice and clean

Output2 x 2,000 kW
Fuelnatural gas
Combustion efficiency106 %
20180327 132151
Thermal technology Hot water & industrial central heating boilers Gas-fired

Tanks at the optimum temperature

Output2,000 kg steam/h + 2 x 4,200 kg steam/h
Operating pressure12 barg
FAQ

Questions? We have the answers.

That will depend on the burner technology and the fuel properties. Common combinations include natural gas and biogas, natural gas and biomethane, or natural gas and hydrogen. In certain applications, other gaseous fuels can be integrated as well.

The switch happens automatically through the burner control system. Depending on the configuration, the installation can switch based on fuel availability, energy prices, emission targets, or preset operating parameters. This keeps heat production continuously available without any manual intervention.

A dual-fuel installation achieves efficiencies comparable to a conventional thermal oil boiler. Efficiency is mainly determined by the boiler technology, the quality of combustion, and the properties of the fuels used.

Absolutely. By combining several boilers of different capacities, heat production can be matched more precisely to actual demand. This prevents unnecessary energy consumption and increases the efficiency of your installation.

As an EPCS integrator, the Callens Group takes charge of the entire process: from on-site analysis and engineering to installation and service. That gives you a single point of contact throughout the full lifespan of your thermal oil boiler with dual-fuel burner. You can find out more about the different steps in our workflow here.

No. A properly designed dual-fuel installation can switch without compromising the continuity of heat production. This keeps heat production stable, even when the availability of a fuel changes.

Discuss your challenge or project with our experts

Would you like to explore which solution is suitable for your specific project?

Our engineers are happy to think along with you, from initial exploration to concrete engineering.

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