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SonFlow SFB20 brazed plate heat exchanger
KONTECH is an official distributor of SonFlow A/S in Bulgaria, Greece, Cyprus and Romania. The SonFlow SFB20 series includes the compact SFB21 and SFB22 brazed plate heat exchangers, designed for HVAC systems, heat pumps, refrigeration equipment and a wide range of industrial heat transfer applications.
Brazed plate heat exchanger SFB21 and SFB22
The SonFlow SFB20 series includes two standalone models: SFB21 and SFB22. They are designed for professional HVAC, heating, cooling, heat pump, refrigeration and industrial applications where compact dimensions and operation at defined system parameters are important.
The models are available with a design pressure of 25 bar, an operating temperature range from -100°C to +185°C, TL plate profile, and ¾″ or 1″ threaded connections. The specific model and configuration are selected according to the technical parameters of the application.
The units feature a copper-brazed construction without replaceable gaskets. The heat exchangers are built from corrugated AISI 316 stainless steel plates, brazed with copper in a vacuum process. The resulting plate pack provides a large heat transfer surface area relative to the overall dimensions of the unit.
SFB21 and SFB22 are configured individually and are available with 11, 15, 21, 31, 41, 51, 61, 71, 81, 91 or 101 plates. The selection of model and plate count depends on the fluids, flow rates, inlet and outlet temperatures, required heat duty and allowable pressure drop.
A distinctive feature of the SFB20 series is the shared dimensional footprint of the two models: a width of 114 mm and a horizontal port centre distance of 65 mm. Each model has its own height and vertical port centre distance, making SFB21 and SFB22 separate alternatives within the compact size range of the SFB series.
Certain SFB20 series configurations are available for fast delivery. Other variants are available on request. The selected model, configuration and current delivery time are confirmed in the quotation.
The price of the SonFlow SFB20 starts from EUR 231 excluding VAT. The stated price is indicative and does not constitute a binding offer. The final price depends on the selected model and configuration and is confirmed in the quotation.
SonFlow SFB20 selection and delivery advantages
SonFlow SFB20 includes two standalone compact models, configured according to the operating parameters of the application. The main advantages for selection and supply are:
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Two standalone models in the compact size range, each with a body width of 114 mm and a horizontal port centre distance of 65 mm
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Selection of the appropriate model and plate count according to the required heat duty and allowable pressure drop
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Configurations from 11 to 101 plates with TL plate profile
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¾″ and 1″ threaded connections to suit the piping system requirements
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Design pressure of 25 bar and an operating temperature range from -100°C to +185°C
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Price from EUR 231 excluding VAT, with the final price depending on the selected model and configuration
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Selected configurations available for fast delivery
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Other variants are available on request. The selected model, configuration and current delivery time are confirmed in the quotation
For applications requiring a gasketed construction and mechanical access to the plate pack, see the SonFlow gasketed plate heat exchangers.
Typical applications of the SonFlow SFB20
The SFB21 and SFB22 models are used as brazed plate heat exchangers in systems with defined operating parameters and compatible fluids.
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Central heating and cooling systems
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HVAC installations
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Heat pump systems
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Refrigeration systems
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Solar thermal systems
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Oil cooling
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Data centres
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Industrial processes
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Marine systems
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Replacement of an existing brazed plate heat exchanger where dimensions, connections and operating parameters are compatible
For fluids containing solid particles or fibres, with high viscosity, or where there is an increased risk of clogging, SonFlow Free Flow plate heat exchangers or another heat exchanger type may be more suitable depending on the specific application.
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Main technical characteristics of SonFlow SFB20
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Construction and materials: corrugated AISI 316 stainless steel plates, copper-brazed in a vacuum process, without replaceable gaskets
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Main dimensions: SFB21: 291 × 114 mm; SFB22: 495 × 114 mm, with depth L1 depending on the number of plates
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Maximum design pressure: 25 bar
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Operating temperature range: -100°C to +185°C
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Plates: TL profile; configurations from 11 to 101 plates
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Connections: ¾″ internal thread or 1″ ISO 7-R pipe thread; NPT threads available on request
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Standards and compliance: EN 13445, PED 2014/68/EU and ASME Section VIII, Div. 1
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Available accessories: insulation jackets, support feet and mounting brackets
The stated design pressure and temperature range are the construction limits of the models and are not sufficient for heat exchanger selection. The appropriate model, plate count and L1 depth are determined according to the fluids, flow rates, inlet and outlet temperatures, required heat duty and allowable pressure drop. After the operating parameters have been reviewed, the quotation specifies the model, number of plates, connection type and corresponding L1 depth.
Data required for an SFB20 quotation
To prepare a proposal for a suitable SFB20 model and configuration, please provide the main operating parameters of the application:
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Fluid type on the primary and secondary sides
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Flow rate on the primary and secondary sides
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Inlet and outlet temperatures on both sides
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Required heat duty, if known
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Operating pressure on both sides
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Maximum allowable pressure drop on both sides
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Required or preferred connection type and size
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Description of the application and operating conditions
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Indication whether the unit is intended for a new installation or as a replacement for an existing heat exchanger
When replacing an existing heat exchanger, please provide a photo of the nameplate, the overall dimensions and details of the connections. The supplied operating data are used to determine the appropriate model, plate count and configuration and to prepare a quotation.
Technical drawing and main dimensions of SonFlow SFB20
Technical data for SFB21
| Parameter | Data |
|---|---|
| Type |
Brazed plate heat exchanger |
| Series |
SonFlow SFB20 |
| Model |
SFB21 |
| Construction |
Copper-brazed, gasket-free |
| Plate material |
AISI 316 stainless steel |
| Brazing material |
Copper |
| Design pressure |
25 bar |
| Temperature range |
from -100°C to +185°C |
| Standards and compliance |
EN 13445, PED 2014/68/EU ASME Section VIII, Div. 1 |
| Connections |
¾” inside pipe thread ISO7-R |
| Number of plates |
11, 15, 21, 31, 41, 51, 61, 71, 81, 91, 101 |
| Dimensional formula |
L1 = N × 1,9 + 7,5 mm |
| Main dimensions |
A: 291 mm (A = height) B: 114 mm (B = width) C: 242 mm (C = vertical centre-to-centre distance) D: 65 mm (D = horizontal centre-to-centre distance) E: 28 mm (E = connection length) |
| Accessories |
Insulation jacket Foundation feet Mounting brackets |
Technical data for SFB22
| Parameter | Data |
|---|---|
| Type |
Brazed plate heat exchanger |
| Series |
SonFlow SFB20 |
| Model |
SFB22 |
| Construction |
Copper-brazed, gasket-free |
| Plate material |
AISI 316 stainless steel |
| Brazing material |
Copper |
| Design pressure |
25 bar |
| Temperature range |
from -100°C to +185°C |
| Standards and compliance |
EN 13445, PED 2014/68/EU ASME Section VIII, Div. 1 |
| Connections |
¾” inside pipe thread ISO7-R |
| Number of plates |
11, 15, 21, 31, 41, 51, 61, 71, 81, 91, 101 |
| Dimensional formula |
L1 = N × 1,9 + 7,5 mm |
| Main dimensions |
A: 495 mm (A = height) B: 114 mm (B = width) C: 446 mm (C = vertical centre-to-centre distance) D: 65 mm (D = horizontal centre-to-centre distance) E: 28 mm (E = connection length) |
| Accessories |
Insulation jacket Foundation feet Mounting brackets |
The data shown represents the standard technical characteristics of SonFlow SFB21 and SonFlow SFB21.
The technical data is based on SonFlow A/S product information current as of November 2025. The manufacturer reserves the right to change the technical specifications without prior notice.
Selected SFB21 plate heat excganger configurations are available from stock for fast delivery. If a different number of plates, plate pattern or connection type is required, the unit can be ordered for production. The indicative lead time for such an order is around four weeks. The specific price, current availability and delivery time are confirmed in the quotation.
Other models in SFB range
Frequently asked questions about SonFlow SFB20
What models are included in the SFB20 heat exchanger series?
The SonFlow SFB20 series includes two models: SFB21 and SFB22. Both have a compact body width of 114 mm and a horizontal port centre distance of 65 mm, but they differ in overall height and vertical port spacing. This allows the two models to cover different installation and thermal duty within the compact SFB size range.
What applications is the SFB20 used for?
The SFB20 series is suitable for a wide range of HVAC, heating, cooling, heat pump, refrigeration, solar thermal and industrial applications. The exact model and configuration depend on the application, fluids used, operating temperatures, flow rates, pressure conditions and required heat duty.
Is heat duty alone sufficient for selection?
No. Heat duty alone is not sufficient for accurate thermal selection. To recommend the correct SFB20 model of brazed plate heat exchanger and exact configuration, we also require the fluids, flow rates, inlet and outlet temperatures, operating pressure and allowable pressure drop.
What is the operating temperature range?
The SFB21 and SFB22 models are designed for operating temperatures from -100°C to +185°C, subject to the applicable pressure and fluid conditions.
What connection types and sizes are available?
The SFB20 series is available with ¾″ female threaded connections or 1″ ISO 7-R pipe threads, depending on the selected model and configuration.
What is the design pressure of the SFB20?
Both models in the SonFlow SFB20 brazed plate heat exchanger series, SFB21 and SFB22, are available with a design pressure of 25 bar.
How much does the SonFlow SFB20 cost?
The price of the SonFlow SFB20 starts from EUR 231 excluding VAT. This price is indicative and does not constitute a binding quotation. The final price depends on the selected configuration and is confirmed in the quotation.
Are any configurations available for fast delivery?
Certain SFB20 series configurations are available for fast delivery. Other configurations can be supplied on request, depending on the required model and technical specification. The selected model, configuration and availability are confirmed in the quotation.
What information is required for a quotation?
Please provide the fluids, flow rates, inlet and outlet temperatures on both sides, required heat duty, operating pressure, allowable pressure drop, connection requirements and a brief description of the intended application.
Request for Quotation
Provide the main technical parameters of your application to receive a quotation for a SonFlow SFB21 or SFB22 brazed plate heat exchanger. After reviewing the data, we will provide a proposal for the appropriate model and configuration, including price, availability and delivery time.
About SonFlow and KONTECH
KONTECH Ltd. is the official distributor of SonFlow A/S for Bulgaria, Greece, Cyprus and Romania.
SonFlow SFB20 is part of the range of copper-brazed plate heat exchangers. The series includes the SFB21 and SFB22 models, featuring AISI 316 stainless steel plates, copper brazing, a design pressure of 25 bar and TL plate profile. The models are intended for professional HVAC, heating, cooling, refrigeration, heat pump and industrial applications where the operating conditions and fluids are compatible with the technical specifications of the heat exchanger.
KONTECH provides quotations based on the submitted technical parameters. The selected model, configuration, price, availability and delivery time are confirmed in the quotation.
Heat transfer solutions from SonFlow A/S
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