Danfoss SONDEX®

Heat Exchangers

SONDEX® fully welded
plate heat exchangers (SAW)

Our SONDEX® fully welded plate heat exchangers (SAW) provide very efficient heat transfer and are primarily designed for use in applications that involve aggressive, demanding media and high process temperatures.

The fully welded plate heat exchangers can achieve very close temperature approaches with true counter-current design. Very small and compact, they are the perfect solution for applications and duties that require a fully welded product, such as a plate and shell or block-type heat exchanger, but do not need their substantial capacities. A product that perfectly matches the specifications of the task will always be the optimal solution.

In their class, our fully welded series outperform shell and tube heat exchangers in every aspect and offers all the benefits of a gasketed heat exchanger as well as increased durability.


Features and benefits

  • Very compact, cost-effective units that take up minimal floor space. They are light in weight and provide very efficient heat transfer, through the courtesy of a true counter-current flow.
  • The gasket-free solutions feature a fully welded plate pack that enable them to work with very high pressure and temperatures. The risks of leaks are severely diminished with a completely welded heat exchanger.
  • The plates in the completely welded plate pack are made from highly resistant materials guaranteed to withstand even the most extreme working conditions.

Technical specifications

  • Connections from DN32 to DN50 (1 1/4" to 2")
  • (Frames designed according to FEA and PED 2014/68/EU (EN13445) and ASME sec VIII, Div. 1 construction standards)
  • Plate materials: AISI 304/316, SMO, titanium*
  • Working pressure up to 25 bar (363 psi)
  • Working temperature -30 °C up to 300 °C (-22 °F to 572 °F)

*other materials available upon request



  • HVAC industry
  • Refrigeration industry
  • Pulp and paper industry
  • Heavy industry
  • Mining industry
  • Petrochemical industry
  • Chemical industry
  • pharmaceutical industry

What kind of heat exchanger is right for me?

The choice of heat exchanger depends on many factors. Our skilled sales engineers design the heat exchanger with the appropriate dimensions and correct specifications based on your input and requirements, to ensure that you receive a quality solution that performs optimally.

Which certificates are available for the heat exchangers?

Our heat exchangers are approved and certified according to industry standards and requirements. For specific details, please reach out to your local SONDEX® brand sales representative.

Where can I get a price list?

Please contact your local SONDEX® brand sales responsible.

How can I get a quotation?

Please contact your local SONDEX® brand sales office. For the most accurate quotation, please prepare the following data:

• Duty,
• Type of media,
• Pressure drop,
• Flow rate,
• Working pressure,
• Thermodynamic properties, Temperature,
• Working temperature.


What would you like to know more about? We offer a wide range of informative content relating to our products. You can find general information about our products in brochures, technical specifications on data sheets, and various instructions in operating and maintenance guides.

Want to know more?

Please get in touch with your local contact person for more information and learn how Danfoss can help improve your business. Additionally, please feel free to send us a mail.

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