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Flue Gas Heat Exchanger

Energy is becoming more and more expensive. Neither private households nor industrial plants can do without thermal energy and savings can therefore hardly be realized due to the increasing energy demand. Accordingly, other ways and means of saving must be found. The important thing here is efficiency. One option that is also cost-effective is the flue gas heat exchanger.

So, if you want to improve the efficiency of your heating system in order to save electricity costs and do something good for the environment, you do not necessarily have to carry out an expensive exchange of the entire heating system. The installation of a flue gas heat exchanger in the existing plant is enough to significantly increase its efficiency.

A flue gas heat exchanger can often achieve a similar result for a fraction of the costs as the complete renewal of a plant. In this way, for example, the heat lost during the manufacture of a work piece is used to preheat or keep the tools, moulds and spaces warm.

After the installation of a flue gas heat exchanger, there are hardly any further costs, as it is very low- maintenance and therefore does not require any additional attention. With a built-in heat exchanger, you can start saving directly.

Let us advise you without obligation and find the suitable product for your company.

Functionality of a flue gas heat exchanger

Indenfor bilindustrien har varmegenvinding bevæget sig fra sportsverdenen til de nye elektriske og hybride modeller, og er en af fremtidens teknologier. For eksempel bliver varmen som opstår når man bremser lagret og omdannet til motorkraft. En varmeveksler til røggas virker efter samme princip.

This is because every heating system also produces waste heat, which is normally lost unused as flue gases. Due to pollutants in the flue gases, this heat cannot be used directly for heating. To be able to use the flue gases nevertheless, a flue gas heat exchanger can be used to heat the heating medium. This means that the heat is no longer lost, but used to generate energy, without any additional consumption or costs.

The flue gases, which can reach temperatures of up to 1200°C, are cooled down to around 30 to 60°C. This drastically reduces the amount of energy required to reach the desired temperature, depending on the heating system. The energy, in the form of heat, of the flue gases is used by the heat exchanger to add them back to the used heating circuits.

In practice, the heat exchanger is mounted between the boiler and the chimney, so there is no need to dismantle the entire system or replace the boiler. This saves time, money and nerves. The flue gases are therefore not only reduced because the energy used is practically recycled, but the installation of such a technology is also relatively simple and the maintenance takes hardly any time.

Another advantage of the flue gas heat exchanger is that it usually uses water for heat recovery. This means that some of the pollutants can already be filtered out of the flue gases and thus also reduce the strain on the filter systems for flue gases. The resulting condensate can usually be discharged directly into the sewer system.

Which heater is suitable?

In principle, a flue gas heat exchanger can be used for virtually any solid fuel. For the use of a heat exchanger, only the medium between which the heat exchange takes place is of interest. A distinction is made here between air-air, air-water, water-water or water-oil. Only the heat energy is exchanged or transferred, the actual substances are not mixed.


This also means, for example, that not only heating air can be heated, but also process water or process oil

– without any contamination of the medium or additional energy consumption.

Nowadays there are hardly any restrictions for a flue gas heat exchanger. There are already enough universal solutions available for all common possibilities. A specially manufactured flue gas heat exchanger offers you individual solutions for improving your personal energy balance or that of your company.

Even modern low-temperature systems benefit from energy recovery, as these systems are constantly evolving and becoming more efficient.

When does a flue gas heat exchanger make sense?

Flue gas heat exchangers can be used in many situations and can easily reduce energy consumption by up to 16 percentage points. This also makes sense for low-energy industries in the long term.

Even with constant energy costs, the installation pays for itself after only a short time. For industrial companies, the advantage of reduced flue emissions is also evident, since less energy is required from the outside. This reduces costs on the one hand, but also demonstrates environmental awareness.

In principle, a flue gas heat exchanger always makes sense when heat leaves the room unused. The mass of this lost heat is enormous, especially in winter. Due to the constantly increasing energy costs, the industry has been relying on this sensible technology for a long time. Since this is very flexible, there are many different areas in which it can and should already be used.

The main industrial customers include, for example, the beverage and food industries, plastics and metal processing, combined heat and power plants and swimming pools. Especially in industries where materials are often heated and cooled, the use of a flue gas heat exchanger can greatly improve a company’s energy balance.

High-quality solutions are in demand

If you would like to obtain a long-lasting added value from the installation of a flue gas heat exchanger, we recommend that you use high-quality stainless-steel systems. These are extremely low- maintenance and much cheaper than installing a new heating system. So, you save money every minute with a flue gas heat exchanger and do something good for the environment.

In addition to the techniques commonly used in the industry, there are also tailor-made solutions that ensure that the requirements placed on the system are met, resulting in a more efficient system. The technical progress is also noticeable in this area, the technology and the mass of the recovered energy is constantly increasing.

Which solution makes the sense for you?

We at exodraft are experts in this field and know the different flue heat exchangers, but more important is that we know with all our experience exactly what helps you the most.

Please feel free to call us or leave your telephone number and we will call you back. In a personal conversation we will be happy to advise you to find the best solution for you together.  

    Fill out this appraisal form to clarify your heat recovery potential:

    How do see your recovered heat being used (you can select multiple options)?
    Transferred to the district heating systemUsed in production processesHeating of factory, warehouse or office premisesUsed for apsorption chillers/refrigerationHot water for bathing facilitiesAir curtain & air heatning systemsHot warter for general cleaning/washing purposesOther