Welcome to DDI’s new website!  This website will feature DDI Heat Exchangers. Take a look around, and don’t hesitate to contact us with any questions or queries.
You may have some files on our site that will require Adobe Acrobat, which can be downloaded here

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.