Directly cuts your energy bill
Part of the waste heat in the flue gas or process line is recovered and used to preheat feed water or for another line.
Product group · Heat Transfer Products
Waste Heat Recovery Exchangers / Economizers
A family of heat exchangers that improves energy efficiency by recovering heat discarded from flue gas or a process line. The investment typically pays for itself quickly through the fuel savings it delivers.
CapacityProject-specific
FluidFlue gas / process waste heat + feed water
Shell materialSteel / stainless steel tube
Design pressure10 / 16 / 25 bar
Counter-flow operation · flue gas flows vertically, feed water passes horizontally · fin-bundle depth is engineered to the flow rate
Why it matters
What does a waste heat recovery exchanger do?
A significant share of the heat discarded from a flue or a process can be recovered with the right exchanger and returned to the system — which translates directly into fuel savings.
Pays for itself quickly
With continuous, high-temperature waste heat sources (such as a boiler flue), the investment typically pays for itself quickly through fuel savings.
Can be retrofitted onto an existing line
If the flue gas flow rate, temperature and the existing flue line's layout are known, it can usually be added to the existing system after the fact.
Designed for high temperature and corrosion resistance
Sulfur compounds and moisture in flue gas can become corrosive, especially below the condensation temperature; the material is selected accordingly.
Types
Sub-types of waste heat recovery exchangers
All three recover waste heat; what sets them apart is the heat source and how deep the cooling goes.
Flue gas economizer
The most common type of waste heat recovery, recovering heat from the hot gas leaving the boiler flue to preheat feed water or another fluid.
- The standard efficiency solution for boiler rooms
- Common for feed water preheating
- Sized to the flue gas flow rate
Process waste heat exchanger
Recovers waste heat from a hot process fluid or exhaust gas on the production line, making it usable in another process step.
- Designed specifically for the process
- Material and cleaning interval are set according to the fouling rate
- Requires integration specific to the production line
Condensing economizer
Cools flue gas down below its dew point to also recover latent heat, achieving higher efficiency than a standard economizer.
- The highest energy recovery rate
- Condensate can be acidic, so the material is selected accordingly
- Condensate drainage must be planned separately
Selection criteria
What data determines the right waste heat recovery exchanger?
Capacity alone isn't enough. Once the six points below are clear, the choice narrows to a single model.
ParameterWhy it mattersWhat we need from you
Recovery capacity
The heat load to be recovered; this directly determines the exchanger's size and tube bundle area.
kW
Waste heat source
Whether it's flue gas or a process fluid; its fouling rate and temperature determine the material and cleaning interval.
Source type, temperature, flow rate
Target use
Where the recovered heat will be used (feed water preheating, process water, etc.) guides the design.
Point of use
Condensation risk
If flue gas is cooled below its dew point, a material resistant to acidic condensate and a drainage path are both needed.
Yes / no
Operating temperature and pressure
Operating temperature and pressure determine the tube wall thickness and material class.
°C and bar
Connection and installation
Flanged, threaded or welded connection, clarified by integration into the existing line and the installation space available.
Connection type and size
For a quote, having the following is enough
It's fine if you don't have all of it. We'll fill in the gaps together with you.
Create a quote request- Recovery capacity (kW)
- Waste heat source and flow rate (flue gas, process, etc.)
- Target point of use
- Whether condensing operation is required
- Operating temperature and pressure
- Mechanical project or specification, if available
FAQ
Questions from the field
The questions we hear most often when quoting waste heat recovery exchangers.
Does waste heat recovery make sense for every facility?
The waste heat's temperature, flow rate and how continuous it is determine the investment's payback period. At low temperatures and with an irregular flow, the return can stay limited; with continuous, high-temperature sources like flue gas, payback is generally fast.
Are an economizer and a waste heat recovery exchanger the same thing?
Economizer specifically describes the type that recovers heat from boiler flue gas to preheat feed water. Waste heat recovery exchanger is the broader term, covering any kind of waste heat source on a process line.
Is a condensing economizer different from the standard type?
Yes. A condensing economizer cools the flue gas down below its dew point to also recover latent heat, achieving higher efficiency than a standard economizer — but the material selection must account for the condensate potentially being acidic.
Can an economizer be added to an existing boiler flue later?
Yes, this is usually possible. If the flue gas flow rate, temperature and the existing flue line's layout are known, an economizer is selected to be retrofitted into the existing system.
Do you only serve Istanbul?
No. While our office is on Istanbul's Anatolian side (Ataşehir), we supply and ship across Istanbul's European side, the surrounding provinces and the Marmara region, and Turkey as a whole — covering your equipment end to end, from a single source.
Next step
Let's work out exactly what you need
Share your fluid type, capacity and operating conditions, and let's work out the right waste-heat-recovery unit together.
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