SONDEX® heat exchangers (a Danfoss brand) are engineered for high thermal efficiency, compact design, and long service life across HVAC, industrial, marine, energy, and process applications.
SONDEX® products are supplied as engineered units. Each heat exchanger is identified by a model designation and a customized ordering code (part number) based on operating conditions, materials, pressure class, and connection types.
The S-Series is the core SONDEX® product range for heating, cooling, heat recovery, and process duties.
District heating & cooling
HVAC systems
Industrial process cooling
Food & beverage
Marine & offshore
Small to Medium Units
S1, S3, S4, S4A
S7, S7A, S8A, S9A
S14, S14A, S15, S16, S17
Medium to Large Units
S19A, S20, S20A
S21, S21A, S22
S30, S31A, S35, S36
S37, S38, S39
Large & Extra-Large Units
S41, S41A, S42
S43, S43A, S44A
S47, S50, S58
S60, S61, S62, S63, S64, S65
S81, S85, S86
S100, S110, S113
S120, S121, S130
S145, S152
S187, S188
S200, S201, S210
S221, S229, S251
Plate materials: Stainless steel (AISI 304 / 316), Titanium, SMO, Hastelloy (optional)
Gaskets: NBR, EPDM, EPDM-HT, FKM
Connections: Threaded, flanged, welded
Pressure class: Up to approx. 25–35 bar (model dependent)
Temperature range: Application-dependent
Designed for fluids containing fibers, particles, or high viscosity media.
Wastewater treatment
Sugar & starch processing
Pulp & paper
Slurry and viscous fluids
SF11A
SF25A
SF53
SF66
SF101
SF123
SF131
SF150
SF160
SF229
SF230
Non-contact plate design
Wide flow channels
Reduced fouling and clogging risk
Easy maintenance
Engineered for marine and specialized thermal duties.
SFD3, SFD5, SFD6, SFD7
SFD13, SFD22, SFD23
SFD35, SFD45
SFD222, SFD245
SFD307/10
Semi-welded construction for applications involving aggressive or hazardous media on one side.
Industrial refrigeration
Ammonia (NH₃) systems
Heat pumps
SW19A, SW19B
SW26, SW26A
SW40A
SW54
SW59
SW102
SW122
SW189
SW202
Welded refrigerant channels
Gasketed secondary side
Increased safety and reliability
Purpose-built SONDEX® units for refrigeration and HVAC systems.
SC85 – Condenser
SWC136 – Condenser
SEC174 – Evaporator
SWE179 – Evaporator
Fully welded units combining plate efficiency with shell-type strength.
High pressure systems
High temperature processes
Aggressive or hazardous fluids
SPS22
SPS72
SPS179
SPS400
SPS646
SPS647
SPS648
SPS1200
SPS1201
SPS1203
Ideal for fouling, viscous, or solids-containing media.
SonSPV 250
SonSPV 500
SonSPV 750
SonSPV 1000
SonSPV 1250
SonSPV 1500
SONDEX® heat exchangers are supplied with engineered ordering codes, not fixed stock part numbers.
| Code Section | Description |
|---|---|
| S20A | Model designation |
| IS / IG / FS | Frame type |
| 16 / 25 / 32 | Pressure class (bar) |
| 29 | Number of plates |
| TK / TL / TM | Plate pattern configuration |
| Material & gasket codes | Defined per application |
Each ordering code is generated based on:
Operating pressure & temperature
Fluid type
Flow rates
Material compatibility
Connection requirements
Which are non-OEM plates 100% compatible with plates manufactured by Sondex / Danfoss.
In 1984 Sondex A/S was founded with aim to provide plate heat exchangers solutions that can be tailored into individual needs. Sondex / Danfoss is based in Denmark, but expanded greatly in the recent years and has become quickly a global enterprise. Sondex / Danfoss is a leading manufacturer of plate heat exchangers with products like Sondex Plates, Sondex Gaskets, and Sondex Fresh Water Generators Plates or Gaskets. Optimized to reduce cost of maintenance and service, and to minimize energy consumption. Sondex/Danfoss PHE plate heat exchangers are ideal choice for a range of applications in the market. Sondex / Danfoss Denmark standard plate heat exchanger is a stellar investment for standard duties, using innovative technologies and smart designs.
PHE Nordic provides services and non-OEM spare parts for Sondex Plate Heat Exchangers, and a wide range of international brands.
Plate Heat Exchanger Plates, Gasketed Plate Heat Exchanger, Plate Heat Exchanger Gaskets, or Fresh Water Generators spares.
Full Traceability
Every plate and gasket at our storage are made of traceable materials, so we can assure that our products contain the exact material fitted for the fluid and temperature going through the Plate Heat Exchanger.
To have full traceability on our Gaskets, every batch of any given Gasket type, has a label with a unique barcode attached, so we know exactly which customer receives which batch number.
Our Plates are laser engraved with type, high/low tater, material quality, thickness and given a unique certificate number, to ensure full traceability.
No matter what kind of Service, Spare Part or Special Component you need, our team is ready to guide you and to ensure the highest quality possible.
Contact our sales team today for further information and offers:
