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By using our heat exchanger, img312 up to 80% of heat that would have been lost otherwise can be recycled. The energy lost as flue gas or process heat usually amounts to between 10% and 15%, and we can help reduce this loss to a minimum. The effective use of waste heat coupled with competitive prices means that an investment in heat recovery can be repaid within a few years. At the same time, CO2 emissions are reduced, benefitting the environment and the company’s green accounting.


Excess heat in steam and flue gas can be recycled using our heat recovery systems, be converted into hot water, or find further use. Possibilities include reintegration of waste heat into the original process or internal use through integration with other processes, space heating, cleaning, or bathing facilities. Therefore, it makes sense img121 to utilize the considerable amounts of energy present in flue gas, steam and other heat processes. Waste heat that cannot be used internally can also be transferred to a third party, such as a municipal district heating network.


As the world’s leading supplier of integrated solutions for recycling of flue gas and process heat, we have abundant competence, understanding, and experience. kompetenceimg It is an important prerequisite for efficient recycling of flue gas to understand the connection between chimney draught and efficient combustion.


How much energy can be recycled, how much you can save, and how much less CO2 will be emitted is something we can calculate using our calculator software exodraft OptiCalcHR™. img113 Contact us – and have us calculate your savings today.


Take a look at our video and have the most important information presented to you in 1:49 minutes.


isoWe don’t compromise on quality, and our solutions are produced according to ISO 9001 and developed with a focus on maximum safety and efficiency. At exodraft, we have set the bar for collaboration between chimney fans and heat recovery systems, and our products are sold in more than 40 countries all over the world.

Heat recovery systems & units

A heat recovery system is typically a ventilation network, that can be installed in private households as well as industrial compounds. They are also known as mechanical ventilation systems (MVHR) or as a “whole house ventilation” and include a heat recovery unit. The ventilation system can extract heat energy through a heat exchanger from the exhausted air and can supply the property with the extracted heat energy. Therefore, up to 95% of the heat can be recovered, that would otherwise have been lost through the ventilation system and can be brought back into the heating system. The performance of a heat recovery ventilation (HRV) system depends on multiple factors, for example: how airtight the dwelling is, the design of the ventilation system and the already existing heating system. A heat recovery unit can provide the house with the right amount of clean and fresh air and reduce the overall pollution, especially when used in industrial settings. HVR can be installed in newly build homes or can be refurbished in already existing systems.

How does heat recovery system work?

The heat recovery process works by continuously preheating incoming cool air with the heat that gets extracted from outgoing exhaust air. Through the ventilation system, fresh air is constantly drawn into the building. Thus, warm air is not simply exhausted into the outside and environment but prefiltered and reused, as well as fresh air is supplied throughout the whole property. Responsible for this process is a heat exchange unit in the ventilation system, that is positioned on top of the building. In most cases a duction and ventilation network with a built-in heat exchanger unit is connected to all rooms in a building and is installed in inside cupboards, loft or ceiling voids. The exhausted air can have a temperature up to 1200°C and can be cooled down to 30°C till 60°C. The heat exchanger unit works through transferring the air heat onto a medium, like water, oil, metal or air which can be used in the central heating system in the property. The system can be regulated and adapted, if a higher usage is necessary, for example cooking, usage of a stove and fireplace. A heat recovery system regulates the temperature inside the property and stale air is constantly exchanged with fresh air. Different heat recovery solutions for various surroundings and settings got developed to facilitated different forms of heat extractions. One of the most used forms is a waste heat recovery or flue gas heat recovery system.

How can a waste heat recovery system be an effective energy saving solution

A waste heat recovery system is especially used on an industrial scale with a vast amount of exhaust. Rising energy prices, environmental standards for companies and the legal reduction for CO² emissions create a rising demand and popularity for this type of system. Waste heat is generated through the everyday usage of electrical machines, large boilers units or cooling systems. The rate for lost energy through flue, exhausted gas or general process heat is around 15 to 20 %. But through a waste heat recovery system can up to 90% of the exhausted heat be recovered. A heat recovery unit is therefore especially useful, when a vast amount of heat gets exhausted through a ventilation system. Especially industrial bakeries, beverage productions, drying facilities and metal processing plants implement and profit extensively from a waste heat recovery system. These industries are also strongly affected by the changing energy prices and are depending on a stable and calculatable costs for heating. Energy-intensive industrial companies get a greater independence from changing energy prices and can save up to 16% of the energy costs. A waste heat recovery system is usable for nearly all fuel types like oil, gas or different kinds of liquids. The won energy can increase significantly the boiler efficiency.

Functions of a waste heat recovery unit

A waste heat recovery unit typically is made out of metal and is implemented between the heating boiler and the chimney. Thus, it is not necessary to install a completely new heating system to save energy. A small adjustment and installation of the heat exchanger unit saves time, money and can have the same results as a completely new heating or ventilation system. Another great advantage of a waste heat recovery system is the automatic pre-filtration of the exhaustion through the unit. By cooling the exhaust down, waste heat recovery units can liquefy gaseous exhaust and filter out pollutants. The resulting condensation can be derived into the sewage without filtration.

What is a flue gas heat recovery system?

Flue gas is normally seen as a waste product by companies and is therefore exhausted into the environment without drawing out the most benefits. A flue gas heat recovery unit can extract valuable heat energy from flue gas and transfer it back into the heat cycle. Flue gas heat recovery systems get more and more efficient. Newest systems can extract 10 % of energy with gas heaters and 5% for oil heaters. A flue gas unit not only works with exhaust but also with air, liquid, and steam. The system overall follows the same procedure as the waste heat recovery unit.

What are the benefits of using heat recovery system?

Using a heat recovery system has many advantaged, whether is it the massive reductions of emissions ratings, the minimization of the energy usage or the improvement of the air quality inside the property. The system reduces the carbon dioxide and lowers the overall emissions level. The biggest benefit for the implementation of a heat recovery unit is the cost factor. Up to 90% of heat in the exhausted air can be recovered. It helps to save on the heating bill and lowers the energy costs significantly. A heat recovery unit can be retrofitted on existing ventilation systems and is, therefore, a cost saving solution to reduce the own energy costs, without implementing a whole new system. Overall provides the solution a balanced ventilation system that recovers heat, which would have been lost and wasted.

Key benefits of a heat recovery system are the removal of condensation and indoor pollution. Fresh air gets constantly heated up and drawn into the house. Therefore, the risk of mold creation gets eliminated and an improvement in health can be observed. The newest ventilation system has a low noise rate and keeps the interior climate at a constant level. Typical buildings in the United Kingdom need an air change every two hours, which means that the house boiler would need to warm up a house with cold air the whole day around. This case can be prevented through the implementation of a heat recovery unit. It reduces the need for internal air regulations and eliminates excessed moisture out of the building and furnishings. Fresh air is constantly supplied to the dwelling, which is ideal for allergy sufferers or people with asthmatic conditions.

A direct reward in SAP can be noticed for choosing an efficient ventilation system and recovering lost heat. It enables the heating system to meet SAP target emissions rates for newly build properties. Main benefits for the commercial premises are the supply of much cleaner and more constant air environment for employees at any time in the year. The lifetime of large boilers gets extended because sudden temperature changes or high temperatures that cause excessive wear and tears can be avoided. The existing boiling and ventilation system work more efficiently and through the reduction of the emissions can the credibility of companies that are working in a greener environment increased. The initial costs for the implementation of a heat recovery system reach the return on investment after 2 years.

Why Choose Exodraft?

Exodraft produces one of the best performing waste heat and flue gas heat recovery systems for private households and industrial factories and has extended experiences in developing and installing the newest heat recovery systems. Important for a heat recovery system is the right size and dwelling design, that can influence extensively the outcome of the final energy savings. The installation of a heat recovery system according to customer requirements and local settings can only be executed by a company with many years of experience. Heat recovery units need maintenance and servicing throughout their lifetime to ensure the optimal airflow and a consisted energy efficiency. Exodraft offers excellent customer service and guarantees a perfectly functioning system for every setting. Only experts in the field of heat recovery systems can assess which solution is the best option for the specific setting.

Exodraft provides durable and long-lasting heat recovery units made out of stainless steel. The system has a low maintenance rate and is one of the most efficient one on the market. The right choice for the heat recovery unit and the ducting choice has direct impact on the performance of the system and costs associated with the installation. It will be ensured that the right system for your specific circumstances and that fits your purposes is chosen. An important aspect is the location for the heat recovery systems, because of the noise, accessibility and performance level. The perfect fit for the maximal efficiency will be ensured. The compact design of the Exodraft system requires minimal space and can be installed in close conjunctions with in a heat production unit. To avoid operation interruptions during cleaning or maintenance operations, a second heat exchanger unit can be ordered and be easily installed, while the main exchanger is cleaned.