SonFlow

What SonFlow does

SonFlow A/S is a Danish privately held manufacturer of plate heat exchangers, headquartered in Kolding, Denmark with plate production and design operations at that site and a historical link to the pump business now run by sister company DanPumps A/S in Haderslev. The company was established in 2019 when DanPumps A/S was renamed and broadened into plate heat exchangers, building on more than 40 years of plate-pattern and thermal-transfer know-how originating from founder Aage Søndergaard Nielsen's earlier company Sondex. Its product portfolio spans traditional gasketed (SF30-SF500), AHRI-certified (AF), Free Flow (SFF), sanitary, condenser/evaporator and brazed plate heat exchangers, complemented by 2025 additions in semi-welded (SFW), plate-and-shell (SFPS) and double-wall variants; the connected DanPumps brand covers submersible and dry-installed wastewater pumps, industrial/marine pumps, drainage/sand/slurry units, and end-suction and double-suction centrifugal pumps. Core technology centers on proprietary optimized plate patterns claimed to deliver up to 15% higher thermal efficiency, corrosion-resistant plate materials (stainless steel, titanium, nickel), non-clogging and knife-impeller pump designs, and in-house brazing capacity added via a 2021 Seco/Warwick furnace.

The company sells to six primary vertical segments — water and wastewater utilities, general industrial, marine, sanitary/food-pharma, HVAC/building services and (newer) data centers — through a hybrid direct-and-channel model: a technical sales team in Denmark plus six wholly-owned subsidiaries in Australia, Germany, the Middle East/Africa, China, Italy and Kosovo, layered on a distributor/agent network covering more than 40 countries. Pricing is project-based B2B with EXW Incoterms 2020 delivery, a 50% deposit / 50% on-delivery payment structure, and a 1,500 DKK minimum order threshold, supplemented by technical support, spare parts and energy-optimization/retrofit services. SonFlow markets primarily through industry trade shows (ISH Frankfurt, IFAT, AHR Expo, ACHEMA and others), downloadable technical resources and a Mailchimp newsletter rather than paid digital advertising.

Revenue is not publicly disclosed; headcount is reported at roughly 40 employees (2020 figure) within an 11-50 band. The company holds ISO 9001:2015, ISO 45001:2018 (Australia), CE marking, AHRI (ANSI/AHRI 400) and WaterMark WMTS 528:2021 certifications, and is privately owned by the founder with no disclosed institutional funding rounds.

Name

SonFlow

Legal name

SonFlow A/S

Website

https://sonflow.dk

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

11–50 employees

Short description

SonFlow A/S is a privately held Danish manufacturer of plate heat exchangers (with sister company DanPumps A/S making centrifugal pumps), serving water/wastewater, industrial, marine, sanitary, HVAC and data-center customers across 40-plus countries via direct subsidiaries in seven markets and a global distributor network.

Ownership category

akta.pro rank

Product category

Industrial Heat Transfer Equipment

NAICS

Power Boiler and Heat Exchanger Manufacturing (332410), Pump and Compressor Manufacturing (33391), Measuring, Dispensing, and Other Pumping Equipment Manufacturing (333914)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Pumps & Pumping Equipment (3561)

akta.pro primary industry

Heat Transfer Equipment (Heat Exchangers, Boilers, Condensers) (IMAHAEAC)

akta.pro secondary industries

Pump & Compressor Packages (Skids, Booster Sets) (IMAHANAG), Heat Exchangers & Thermal Transfer Equipment (IMAHAKAC), Heat Exchangers, Coils & Hydronic HVAC Components (IMADANAF)

Keywords

• Plate heat exchangers
• Centrifugal pumps
• Wastewater pumping
• Thermal transfer equipment
• Industrial HVAC equipment

Headquarters

HQ city

Kolding

HQ country

Denmark

HQ region

Europe

Offices8 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Plate heat exchanger sales: SonFlow designs, manufactures, and sells a comprehensive range of plate heat exchangers including traditional gasketed, AHRI-certified, Free Flow, sanitary, condenser/evaporator, and brazed plate heat exchangers. Products are customized to specific temperature requirements and capacities.
2. Pump sales (DanPumps brand): DanPumps sells a range of centrifugal pumps including wastewater, industrial, marine, sanitary, drainage/sand/slurry, end suction, and double suction pumps. Products are manufactured and tested in Haderslev, Denmark. Spare parts for all pump models are also sold.
3. Technical support and spare parts: DanPumps and SonFlow provide technical support, maintenance services, and spare parts including for discontinued pump brands (Pumpex, PX Pumper). Energy optimization services are offered including replacement of old plate stacks with new energy-efficient plates.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels5 records

Core offering

SonFlow A/S designs, manufactures, and sells plate heat exchangers (gasketed, AHRI-certified, Free Flow, sanitary, condenser/evaporator, brazed, and Plate-and-Shell/Semi-Welded/Double-Wall variants) together with DanPumps centrifugal pumps (wastewater, industrial, marine, sanitary, drainage/sand/slurry, end-suction, and double-suction lines). All products are engineered and produced in Denmark for use in wastewater treatment, industrial processes, marine, sanitary, HVAC, and data center applications, with sales handled through regional subsidiaries and a 40+ country distributor network.

Product overview

SonFlow offers two core product lines: SonFlow-branded plate heat exchangers and DanPumps-branded centrifugal pumps, both designed to work together in integrated flow systems. The plate heat exchanger portfolio includes traditional gasketed units (SF30-SF500), AHRI-certified models (AF Series), Free Flow units (SFF Series) for difficult media, sanitary units for food/pharmaceutical applications, condenser/evaporator units, and brazed plate heat exchangers (SFB Series) in 11 sizes. New products launching include the SFPS Plate-and-Shell, SFW Semi-Welded, and Double-Wall series. The pump portfolio includes submersible (S-WP) and dry-installed (S-WN) wastewater pumps, industrial/marine pumps (S-IP/S-MP), drainage/sand/slurry pumps, and end suction pumps (S-ENP/S-ELP/S-ECP/S-EMP/S-DSP). Both product lines are designed to be paired for optimal energy solutions in district heating, wastewater treatment, marine, and industrial applications. All products are designed, developed, and manufactured at facilities in Kolding, Denmark.

Differentiator

Problem solved

Functional benefit

Brands

• DanPumps: Brand name for pumps - includes wastewater pumps, industrial pumps, marine pumps, and drainage/slurry pumps
• SonFlow

Products and services

• Traditional Plate Heat Exchangers (SF30–SF500 Series) Traditional gasketed plate heat exchangers for HVAC, industrial, marine, and hygienic applications. Optimized plate patterns provide up to 15% more efficiency than previous designs, with connections from DN25 to DN400.
• AHRI-Certified Plate Heat Exchangers (AF Series) AHRI-certified liquid-to-liquid plate heat exchangers independently tested under ANSI/AHRI Standard 400, with annual performance verification.
• Free Flow Plate Heat Exchangers (SFF Series) Plate heat exchangers with deep channels without contact points, designed for difficult media containing particles, fibers, and high-viscosity liquids; unique pattern minimizes clogging and fouling.
• Sanitary Plate Heat Exchangers Plate heat exchangers constructed to meet hygiene requirements for food, beverage, and pharmaceutical industries; certified under the Danish Food Authority Smiley scheme with CIP capability.
• Condenser/Evaporator Plate Heat Exchangers Plate heat exchangers designed for condensing low-pressure steam and handling evaporation processes in food, sugar, biogas, paper, mining, petrochemical, chemical, and alcohol production.
• Brazed Plate Heat Exchangers (SFB Series) Copper-brazed plate heat exchangers offering high thermal performance for heating and cooling applications. Compact, permanently sealed design suitable for HVAC, refrigeration, and industrial processes, with 11 sizes available.
• Plate-and-Shell Heat Exchangers (SFPS Series) Plate-and-shell heat exchangers with laser-welded cassettes that tolerate extreme temperatures and pressures, designed for reliable condensation and evaporation performance.
• Semi-Welded Plate Heat Exchangers (SFW Series) Semi-welded plate heat exchangers ideal for aggressive media; laser-welded cassettes provide strength, high efficiency, and easy CIP cleaning.
• Double-Wall Plate Heat Exchangers Double-wall plate heat exchangers developed to prevent cross-contamination and ensure reliable performance under operational conditions; welded construction provides strength and durability.
• Submersible Wastewater Pumps (S-WP Series) Submersible wastewater pumps for demanding pumping tasks with non-clogging impellers; available with standard or knife impellers for handling solid particles.
• Dry-Installed Wastewater Pumps (S-WN Series) Dry-installed wastewater pumps for stationary applications with non-clogging impellers; designed for easy maintenance, long lifetime, and high operational reliability.
• Industrial / Marine Pumps (S-IP / S-MP Series) Industrial and marine pumps suitable for various demanding pumping tasks in clean or slightly contaminated liquids with low content of solid particles.
• Drainage, Sand and Slurry Pumps Pumps designed for drainage, sand, and slurry applications, handling difficult media in various industrial settings under the DanPumps brand.
• End Suction Norm Pumps (S-ENP / S-ELP Series) Horizontal radially divided single-stage end-suction centrifugal pumps with closed impellers. S-ENP in DN32–DN150 (EN733) and S-ELP in DN150–DN250 (EN1092); designed for clean or slightly contaminated liquids.
• End Suction Close-Coupled Pumps (S-ECP Series) Horizontal/vertical single-stage end-suction centrifugal pumps with closed impellers and close coupling; EN733 dimensions, available DN32–DN150.
• End Suction Multi-Stage Pumps (S-EMP Series) Horizontal multi-stage centrifugal pumps with closed impellers and diffusers in end-suction design; DN40–DN150 with capacity up to 400 m³/h and lift up to 450 m.
• Double Suction Pumps (S-DSP Series) Axially split single-stage double-suction centrifugal pumps with horizontal or vertical installation; DN65–DN600 with capacity up to 6,000 m³/h.
• Technical Support, Spare Parts & Energy-Optimization Services Technical support, maintenance services, and spare parts (including for discontinued pump brands such as Pumpex and PX Pumper), plus energy-optimization services including retrofit of old plate stacks with new energy-efficient plates.

Quantifiable outcome

• Plate efficiency improvement of up to 15% compared to previous generation plates
• +3 more outcomes

Named customers3 records

Segments6 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Four partnerships are on record, tiered minor and core.

• Noatelli (Romania distributor)minorChannel Partner/ Reseller/ Distributor · 28 January 2022Noatelli is a distributor representing SonFlow in Romania, specializing in plate heat exchangers and pumps. Noatelli is a well-known supplier across a wide range of product categories.
• Lemvigh-Müller (aGreenment™ program)minorStrategic or Co-development Partner · 26 January 2022SonFlow participates in Lemvigh-Müller's aGreenment™ partnership program, a green supply chain initiative. As part of the agreement, steel deliveries are consolidated to fixed days, allowing the supplier to optimally plan, pack, and load trucks, reducing kilometers driven and CO2 emissions. The program also includes plans to fuel trucks with HVO100 biodiesel, potentially reducing CO2 by up to 90%.
• Seco/WarwickcoreTechnology or Integration · 11 June 2021SonFlow selected Seco/Warwick to supply a brazing furnace for producing customer-customized brazed plate heat exchangers. This investment enables SonFlow to manufacture brazed heat exchangers tailored to specific customer requirements at their Kolding facility.
• Clean Sea Solution ASminorOthersClean Sea Solution AS uses DanPumps pumps on floating docks that automatically clean harbors of marine plastic, diesel film, and other pollutants. DanPumps pumps create a 'waterfall' effect that directs waste to a collection container, helping reduce harmful substances in the ocean.

Scale indicators7 records

Recent moves14 records

Expansion highlights6 records

Market position

Competitive moat5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/sonflow-a-s

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries6 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SonFlow