DDI Heat Exchanger Home

We will be at IFAT Munich Germany show, Booth A4 /306, 5-9 MayTake a look around, and don’t hesitate to contact us with any questions or queries.

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New Feature

Comparing DDI “Rectangular, Square, Cube” tm Heat Recovery to competition

Since DDI’s Heat Recovery System has a Minimum Gap of 3″ on both sides (to avoid blockage) it makes no difference which side has Water or Sludge, or even both sides could have Sludge (for Heat Recovery).  

We achieved our NON-PLUG design (compared to the Spiral design) via large GAPS, NO OBSTACLES and ROUND CURVES. 

DDI has achieved the possibility of having THE SAME FLOW in both sides (for Heat Recovery), compared to Tube and Shell exchangers which cannot do it (see the SURFACE Heat Transfer area and FLOW area Comparisons). 

DDI’s overall size is SMALLER then the Tube and Shell and does not require Grinders or Macerators or Screens (saves 200,000$ in 10 years) as the Spiral design does. 

We have had many Engineers working for many years to come up with this design and TESTED it in real life with MANY working units.

Our Mission

To provide high quality Heat Exchangers with our unique, efficient, non-pluggable design.

Our Heat Exchanger is the ONLY efficient heat-recovery exchanger available.

Company Profile

DDI was founded in 1980 and has been providing quality service and reliable solutions ever since. DDI is a well established Canadian company experienced in the design and manufacturing of plate type heat exchangers specifically suitable for applications in heat recovery from liquid waste materials containing large size solids such as municipal sludges and many other processes.

Contact Information



Mailing address

305 Baffin, Dollard-Des-Ormeaux (Montreal), Quebec Canada H9A3G4

U.S. Address

(Please send mail to the mailing address above)

Electronic mail

General Information: Contact Us


Please help us to improve and promote the new

GREY WATER “Energy Recovery Solution”.

By emailing us your comments. We thank you for your support.


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