After early technical studies, Gilles Lalonde starts his career as an industrial draftsman in transportation, naval construction, industrial ventilation and the first heat recovery systems. He works as a draftsman-designer for a workshop specialized in machining, robotics and pneumatic and hydraulic circuits development.The 70’s and the first energy crisis make a great impact on his choice of career. He decides to devote himself to steam recovery in 1981.


Gilles designs the first SCCS® (Steam-Condensate Closed System) and a series of related products, among which the vertical heat exchanger, which he installs at Agropur in Saint-Jean-sur-Richelieu. Other SCCS® follow.


Gilles starts Lalonde Systhermique inc. and implements many SCCS®, including one at the Quebec Cartier Mining Company (now ArcelorMittal). In 1988, he aquires the Gestra distribution for Quebec and, a few years later, he becomes their distributor for Canada. Energy savings and steam condensate system optimization are his passion. Antoine Lavoisier’s famous quote: “Rien ne se perd, rien ne se crée, tout se transforme” applies especially well to steam. Gilles designs a SCCS® without make-up water.


the Gestra distribution division is sold. Gilles Lalonde concentrates his efforts on energy savings with more SCCS® installations. After being schooled in specialized education, Éric Lalonde redirects his career and becomes a technician in building mechanicals. He works as a draftsman with a number of consulting engineering firms and as a building mechanicals technician at an automation and control distributor. He teaches AutoCAD in Repentigny and teaches energy savings to stationary machine mechanics in Lachine.


Éric Lalonde takes over and becomes the head of the company. The adventure father and son continues today.

Values - Mission - Vision

The members of the LSI team are aware of the importance of providing a quality service regardless of the size of the project. They act to achieve the ultimate objectives and maintain the relationships of trust that underlie the success of any project. We measure ourselves at two levels of satisfaction : our employees and our customers


Collaboration and Teamwork
Creativity, Integrity and honesty
Employee Well-Being


Develop and improve the use of steam with our customers to make them more competitive in their market while reducing environmental impact.


Be the benchmark and trusted company, which designs essential sustainable solutions to ensure a better, safer and healthier life for citizens.

Team Members

Éric Lalonde

Project Manager

Tel. 450-679-0875 p.102
Cell. 514-919-6971 eric.lalonde@systhermique.com

Gilles Lalonde

Senior Designer

Tel. 450-679-0875 p.101
Cell. 514-386-6971

Kin Fay Shek, Jr. Eng.

Business Development
Sales Representative

Tel. 450-679-0875 p.109
Cell. 514-604-6971

Chantal Garand


Tel. 450-679-0875 p.103


Projects & Industry

  • Thermocompressor
  • Evaporator
  • Heat Exchanger Plate
  • Glycol
  • Sanitary Water Heat Exchanger
  • Hot water Heat Exchanger
  • Autoclave
  • Condensate Return Tank
  • Heat Echanger Steam/Liquid
  • Steam Traps Survey

  • Syphon
  • Paper Roller Coaster
  • Dryer
  • Rotary Joint
  • Heated Tables
  • High Pressure Tank
  • Boiler Pumps
  • Steam Shower
  • Condensate Return Tank
  • Heat Echanger Steam/Liquid

  • Condensate Return Tank
  • Optimization
  • Heat Echanger Steam/Liquid
  • Glycol
  • Condenser
  • Heating Unit
  • Anti-contamination Heat Exchanger
  • Air Make-up

  • Desuperheater
  • Economiser
  • Thermocompressor
  • Evaporator
  • Black Liquor Heat Exchanger
  • Saveall/Thickening
  • Shower Water
  • Air Make-up
  • Superheated Steam Recovery Water Heater