Hot water & industrial central heating boilers

For industrial processes, hot water and industrial central heating boilers offer an efficient and reliable solution.

From design and engineering to installation, service and maintenance: our specialists lead the entire process. This ensures you get a tailor-made installation, with maximum attention to energy efficiency, operational reliability and smooth integration within the existing infrastructure.

Discuss your heat demand

When is a hot water or industrial central heating boiler the right answer to your heat demand?

Hot water installations and industrial central heating boilers are an efficient solution for production processes requiring temperatures between 70 °C and 200 °C. They are used for process heating, building heating, drying processes, heat exchangers and applications where a stable heat supply is important.

Industrial central heating boilers:

Industrial central heating boilers are especially worthwhile for supply temperatures up to 110 °C. Thanks to their simple design, limited need for peripheral equipment and inspection-free operation, they are a cost-efficient solution for many industrial applications. What’s more, industrial central heating boilers are direct-fired, so they reach the required temperature quickly and can smoothly respond to changing heat demands.

Hot water boilers:

Hot water installations, on the other hand, can reach temperatures up to ± 200 °C. They operate within a closed circuit and ensure stable heat transfer. That makes them an attractive alternative for processes where steam is not required. It is possible to further increase the efficiency of this thermal technology through energy recovery and economizers.

Poppies Bakeries CV Restwarmte Warmtewisselaar Buffervat PRJ250188 3
Poppies Bakeries CV Restwarmte Warmtewisselaar Buffervat PRJ250188 6

Which type of hot water or industrial central heating boiler is the most suitable solution?

A first decisive factor when choosing the right heat installation is the desired temperature level.

Is a supply temperature up to 110 °C sufficient? Then an industrial central heating boiler is often an efficient and economically attractive solution. For higher temperatures up to ± 200 °C, a hot water installation is a suitable alternative.

To determine the right type of boiler within this spectrum, other aspects come into play: consumption profile, desired heat-up speed, available energy sources, possibilities for energy recovery and desired emission reduction.

Our engineers take all these factors into account and advise you on the hot water or industrial central heating installation that best suits your technical and economic objectives.

Ask our experts for advice
SOLUTIONS

The Callens Group offers a wide range of hot water and industrial central heating boilers

From electric boilers to (bio/syn)gas-fired or hydrogen-fired installations: at the Callens Group, we always develop a solution tailored to your heat demand.

Callens cv elektrisch 2

Electric hot water and industrial central heating boiler

Electric hot water and industrial central heating boilers provide process heat without direct emissions on site. They are worthwhile for companies focusing on electrification or lower CO2 emissions in low to medium-temperature applications.

Technical range:

  • Output: up to ± 20 MW
More about electric hot water and industrial central heating boilers
Mervielde Ertvelde CV 2x2000 k W PRJ6846

Gas-fired hot water and industrial central heating boiler

Gas-fired hot water and industrial central heating boilers offer a reliable solution for continuous process and building heat. Thanks to their simple design, fast control and high operational reliability, they are widely used in industrial environments.

Technical range:

  • Output: up to ± 20 MW
More about gas-fired hot water and industrial central heating boilers
Terumo Leuven hoogrendements cvketel 2x1280k W PRJ240037 2

Biogas-fired hot water and industrial central heating boiler

Biogas-fired hot water and industrial central heating boilers are worthwhile for companies that valorize organic residual streams or have their own digestion plant. The biogas is used for stable heat production, reducing dependence on fossil fuels.

Technical range:

  • Output: up to ± 20 MW
More about biogas-fired hot water and industrial central heating boilers
Callens stoom syngs

Syngas-fired hot water and industrial central heating boiler

Companies that have syngas as a by-product stream, or that produce it themselves within their process, can use it for heat production. This valorizes an existing energy stream and reduces the consumption of primary or fossil fuels.

Technical range:

  • Output: up to ± 20 MW
More about syngas-fired hot water and industrial central heating boilers
Konings Zonhoven Hybride voorzien 4 T 13 barg PRJ250153 4

Hybrid hot water and industrial central heating boiler

  • Hybrid hot water and industrial central heating boiler
  • Hybrid hot water and industrial central heating boilers combine multiple energy sources, such as electricity, natural gas, biogas or waste heat. That makes it possible to respond flexibly to energy prices, grid capacity and sustainability goals.
  • Technical range:
  • Output: up to ± 20 MW
More about hybrid hot water and industrial central heating boilers
Callens stoom dual fuel 3

Hot water and industrial central heating boiler with a dual-fuel burner

A dual-fuel burner makes it possible to combine two fuels within a single installation. That increases security of supply and gives industrial sites more flexibility when energy prices or fuel availability change.

Technical range:

  • Output: up to ± 20 MW
More about dual-fuel hot water and industrial central heating boilers
Ardo Violaines Combiketel bakdampen TO 800k W 3

Hot water and industrial central heating boiler in a combined set-up

A combined set-up brings several heat sources or boiler types together into a single integrated installation. This creates a flexible and reliable heat supply that can be easily adapted to changing energy or production needs.

Technical range:

  • Output: up to ± 20 MW
More about hot water and industrial central heating boilers in a combined set-up
Callens stoom back up 2

Back-up hot water and industrial central heating boiler

  • A back-up boiler builds extra security into the heat supply. The installation prevents production downtime during maintenance, breakdowns or peak loads, ensuring the continuity of the production process.
  • Technical range:
  • Output: up to ± 20 MW
More about back-up hot water and industrial central heating boilers
THE CALLENS GROUP IN FIGURES

One partner. 60 years of expertise. Complete peace of mind.

With Callens Group, one partner manages the entire journey: from design and engineering to installation, service and maintenance. This integrated approach combines technical expertise, project experience and a strong service organization.

+500 projects per year

60 years of experience in EPCS projects

Service and support within 2 hours

Always close to our customers with 13 branches

+400 qualified team members

Reduce your CO2/NOX emissions by up to 100 %

How can hot water and industrial central heating boilers reduce emissions?

The energy supply of industrial companies is under pressure. Energy prices fluctuate sharply, the availability of energy sources changes constantly and the requirements around emissions and sustainability keep getting stricter. At the same time, new opportunities are emerging to produce heat more efficiently, flexibly and sustainably.

Within hot water and industrial central heating installations too, there are several options to seize these opportunities.

Which solution best suits your situation? Our engineers are happy to explore that together with you. Based on your heat demand, production environment and future plans, they design a hot water or industrial central heating installation that is technically feasible, economically viable and ready for the future.

Ask our experts for advice
Terumo Leuven hoogrendements cvketel 2x1280k W PRJ240037 1

Electrification of hot water and industrial central heating boilers

Electric hot water and industrial central heating boilers produce heat without direct emissions on site. Connected to green power, they are an attractive solution for companies that want to make their low or medium-temperature processes more sustainable.

In addition, they offer benefits such as high efficiency, simple control and smooth integration into an electrified production environment.

Flexible heat solutions

Energy prices and the availability of energy sources are evolving constantly. That is why more and more companies opt for hybrid installations, combined set-ups or dual-fuel systems that can combine different energy sources.

By smartly switching between, for example, electricity, natural gas, biogas or hydrogen, your heat supply remains secure while responding to changing market conditions and sustainability goals.

Alternative fuels

Biogas, hydrogen, syngas and liquid residual streams offer new possibilities to produce heat with a lower ecological footprint.

The optimal choice depends on factors such as availability, fuel quality, investment costs, emission requirements and operational reliability. Thanks to our technology-independent approach, we always advise you on the solution that best suits your production process and energy context.

Integration of residual energy

Industrial central heating boilers and hot water installations are particularly worthwhile if you want to integrate waste heat. Thanks to their lower medium temperatures, they can often be efficiently coupled to available heat sources within the site.

This increases the efficiency of the production process, reduces the demand for primary energy and creates a more sustainable heat supply.

Partnering with the Callens Group means peace of mind, reliability and certainty

A hot water or industrial central heating boiler is an investment for decades. That is why it’s best to choose a partner who both provides the right solution and offers the service needed to guarantee lasting performance. You’ll find that combination at the Callens Group.

At the Callens Group, you have a single point of contact for your entire steam project: from the first analysis to installation, including service and maintenance. This keeps the process clear and reduces the need for separate coordination between different parties.

The Callens Group is not tied to a single brand, manufacturer or technology. This allows us to select the solution that is technically and economically the most attractive for each project. To do so, our engineers take account of energy prices, grid capacity, water quality, emission targets, available space and total cost of ownership to provide you with a solution that integrates perfectly into your production environment.

With more than 120 service and maintenance specialists, the Callens Group has one of the largest service teams. Preventive maintenance, interventions, remote monitoring and an extensive stock of spare parts ensure that your steam installation remains maximally available and that unplanned downtime is kept to a minimum.

Department of Technology

The Department of Technology is the Callens Group’s innovation center. Here, new developments in heat technologies are assessed for their technical feasibility and their added value for industrial applications. Only proven technologies ultimately find their way to customers.

With 13 locations across Belgium, the Netherlands and France, we combine the benefits of an international group with the proximity of local teams. This allows us to act quickly.

Projects with hot water and industrial central heating boilers

Soudal Turnhout afzuiging drijfgassen PRJ12563 13
Air technology Extraction Gas and vapor extraction

Extraction system takes on hazardous propellants

Capacity40,000 m3/h
Zone typeAtex
Callens cvketel wisselende warmtevraag
Thermal technology Hot water & industrial central heating boilers Gas-fired

Central heating boiler rides the waves of a wood drying plant’s fluctuating heat demands

Output4,200 kW
Combustion efficiency95%
Volvo
Thermal technology

Residual heat makes its way to the boiler room

Output2 x 12.5 MW
Operating conditions125 °C - 12 barg
FAQ

Questions? We have the answers.

Both systems produce hot water for industrial applications but differ in temperature range and field of application. Industrial central heating boilers are typically used for temperatures up to 110 °C and are an efficient, inspection-free solution for process and building heating. Hot water installations can reach temperatures up to around 200 °C and are used when higher process temperatures are required.

Hot water and industrial central heating boilers are used for process heating, building heating, drying processes, heat exchangers, cleaning processes and other applications where a stable heat supply is required. They are used in, among others, the food industry, chemicals, pharmaceuticals, wood processing, the building materials industry and logistics environments.

CO2 emissions can be lowered through electrification, the use of biogas or hydrogen, the use of alternative fuels, energy recovery or the integration of hybrid systems. Which solution is most attractive will depend on your company’s available infrastructure, heat consumption and sustainability ambitions. Curious which measures have the biggest impact for your installation? Contact our specialists; they are happy to analyze your current heat supply.

Depending on the installation, hot water and industrial central heating boilers can run on natural gas, biogas, hydrogen, syngas, liquid residual streams or electricity. In addition, hybrid configurations, dual-fuel systems and combined set-ups, using several energy sources, are possible.

Industrial central heating boilers are typically used for process temperatures up to around 110 °C. Depending on the design, hot water installations can achieve temperatures up to around 200 °C within a closed circuit. The choice depends on the requirements of the production process.

Absolutely. Thanks to their relatively low medium temperatures, these systems are particularly suitable for integrating waste heat. Heat from production processes, compressors, flue gases or other installations can be reused within the heat network, which significantly lowers energy consumption. Read more about our solutions for energy recovery.

An industrial central heating boiler is often the most energy-efficient and economical choice for processes that do not require higher temperatures (up to 110 °C). What’s more, thanks to their simple design, limited need for peripheral equipment and inspection-free operation, industrial central heating boilers are usually cheaper in terms of investment, maintenance and operation than steam or thermal oil systems. Finally, they are particularly suitable for the integration of waste heat and energy recovery. Would you like to know whether an industrial central heating boiler is worthwhile for your specific context? Put your question to our engineers.

When sizing the installation, we look at the required thermal output, the desired temperature, operating hours, peak loads, future expansion plans and the available energy sources. Correct sizing ensures optimal energy efficiency and prevents over or undercapacity.

For a manufacturer of wooden pallets and packaging, the Callens Group delivered an industrial central heating installation that serves four wood-drying chambers from a single central boiler. The central heating boiler has an output of 4,200 kW and a combustion efficiency of 95 %. Thanks to an in-house developed PLC control system, a control accuracy of 1 °C is achieved, while a large buffer makes it possible to flexibly serve one or several drying chambers at the same time.

More info: /projecten/cvketel-surft-mee-op-wisselende-warmtevraag-van-houtdroogkamer

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Are you feeling the heat from all the possibilities?

Our specialists are happy to help you further.

Discuss your challenge