RESOL
RESOL is a German solar-thermal technology company specializing in controllers, pump stations, and related system components.
Last updated August 25, 2026
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Overview
RESOL, formally identified as RESOL Elektronische Regelungen GmbH, is a German manufacturer of control and system technology for solar-thermal installations. The company is headquartered in Hattingen, North Rhine-Westphalia, and develops products used to regulate, monitor, and integrate solar-thermal heating systems. Its portfolio includes solar controllers, pump stations, modules, sensors, and related accessories. RESOL's products are intended to coordinate heat collection, circulation, storage, and system protection in residential and other small-scale thermal-energy applications. The company was founded in Hattingen in 1977 by Rudolf Pfeil. Its earliest products were solar controllers assembled by Pfeil in a private apartment, reflecting the small-scale origins of the business and its close connection to the emerging solar-thermal market. After several years in neighboring Sprockhövel, RESOL returned to Hattingen in 1998, moving into a new facility. Additional construction followed in 2007, and a further extension was under development in 2009. The reported expansion was designed to bring total production and office space to approximately 6,600 square metres. RESOL's growth accelerated during the 2000s. The business moved from a one-person operation toward an internationally oriented manufacturer with subsidiaries, agencies, distributors, and OEM relationships. According to the referenced company profile, RESOL generated turnover of €29 million in 2008 and employed 160 people in 2009. These historical figures are reported for their respective years and should not be treated as current financial information. The same source describes nearly 80 percent growth in 2008 and an increase in turnover of more than 400 percent after the introduction of a structured process-management program. A major operational turning point came in 2005, when RESOL began applying intensive process management with the assistance of a consultancy specializing in synchronous production systems influenced by the Toyota Production System. Assembly operations were reorganized from a workshop-style manufacturing model into a more flexible industrial production process. The changes included streamlined process chains, revised workplace layouts, and shorter production cycles. This manufacturing transformation was presented as a key factor behind the company's rapid expansion. Research and development, manufacturing, and administration were reported to remain concentrated at the Hattingen headquarters. RESOL also developed an international route to market through subsidiaries in France and Spain, agencies in the United Kingdom, Sweden, and Bulgaria, and authorized distributors across Europe, the Middle East, North America, and Asia. Strategic OEM arrangements enabled RESOL-made controllers to appear under other companies' brands in more than 50 countries. The brand has also received recognition for product design and its contribution to solar-energy use. RESOL was named a Solar Company 2000 by the Solar-Unternehmen 2001+ initiative. Its FlowCon Pro pump station received an iF Design Award in 2001 and an ISH Design Plus Award, while the FlowCon D pump station received another iF recognition in 2008. Other products, including the RS600 MIDI and DeltaSol A solar controllers and the FlowCon S pump station, received Red Dot design recognition. In 2009, the FlowCon Sensor pump station received an Intersolar Award in the solar-thermal category. The available reference material primarily describes RESOL during the late 2000s. It does not provide sufficiently current information to establish the company's present ownership, leadership beyond its founder and general manager, current financial performance, website, or operating status. Accordingly, those aspects remain unspecified where the source material does not support a reliable conclusion.
History
RESOL was established in Hattingen, Germany, in 1977 by Rudolf Pfeil. The company's first solar controllers were produced by Pfeil in his private apartment, making the business an early specialist in the control technology associated with solar-thermal heating. After several years, the enterprise moved to nearby Sprockhövel before returning to Hattingen in 1998. The return was accompanied by investment in a dedicated facility, followed by another building added in 2007. During the 2000s, RESOL developed from a small founder-led operation into a manufacturer with international distribution and several overseas commercial relationships. A process-management initiative launched in 2005 played an important role in this transition. With support from a consultancy experienced in synchronous production and Toyota Production System methods, RESOL reorganized its assembly operations. Manufacturing steps were consolidated, workplace arrangements were redesigned, and cycle times were reduced. The company described the result as a shift from a manufactory model to a flexible industrial production system. The business expanded its international presence through subsidiaries in France and Spain, agencies in the United Kingdom, Sweden, and Bulgaria, and authorized distributors serving markets throughout Europe, the Middle East, North America, and Asia. OEM partnerships also allowed RESOL controllers to be marketed under partner brands. The available source states that RESOL products could be found in more than 50 countries through these channels. RESOL's main activities remained research and development, production, and administration at Hattingen. In 2009, an extension to the existing site was being constructed, with planned total plant and office space of approximately 6,600 square metres. The company profile from that period reported 160 employees in 2009 and €29 million in turnover for 2008. It also reported very rapid growth in 2008 and turnover growth of more than 400 percent following the adoption of synchronous production. These are historical figures tied to the cited period, not current company disclosures. Product development centered on solar-thermal controllers and integrated pump-station technology. RESOL's FlowCon range received repeated design attention: FlowCon Pro won an iF Design Award in 2001 and an ISH Design Plus Award; FlowCon D received iF recognition in 2008; and FlowCon Sensor received an Intersolar Award in 2009. Solar controllers such as RS600 MIDI and DeltaSol A, along with the FlowCon S pump station, were also cited as Red Dot-recognized products. The company was additionally named a Solar Company 2000 by the Solar-Unternehmen 2001+ initiative. The available material describes RESOL principally as it existed in the late 2000s. It does not establish subsequent ownership changes, management changes, financial results, current headquarters arrangements, or whether the business remains active today. Rudolf Pfeil is identified as founder and general manager and as the owner of the entire company in the referenced account.
- 2009
FlowCon Sensor wins Intersolar Award
[1]The FlowCon Sensor pump station receives an Intersolar Award in the solar-thermal category.
- 2008
FlowCon D receives iF recognition
[1]The FlowCon D pump station receives an iF design award.
- 2007
Additional Hattingen building is added
[1]The company expands its Hattingen premises with an additional building as production and office requirements grow.
- 2005
Synchronous production program begins
[1]RESOL begins a process-management program based on synchronous-production principles to improve manufacturing efficiency.
- 2001
FlowCon Pro receives design awards
[1]The FlowCon Pro pump station receives an iF Design Award and an ISH Design Plus Award.
- 2000
Solar Company 2000 recognition
[1]RESOL receives recognition for its commitment to solar-energy generation and use.
- 1998
Return to Hattingen headquarters
[1]After operating for several years in neighboring Sprockhövel, RESOL moves back to Hattingen into a new facility.
- 1977
RESOL is founded in Hattingen
[1]Rudolf Pfeil establishes RESOL in Hattingen and begins producing solar controllers on a small scale.
Products and positioning
A specialist, engineering-led supplier of control and hydraulic-integration technology for solar-thermal systems, positioned around system reliability, modularity, production efficiency, and design-recognized equipment.
Solar-thermal control systems
Solar controllers
RESOL's solar controllers regulate the operation of solar-thermal installations, coordinating pumps and heat-transfer functions according to system conditions. The range includes products such as the RS600 MIDI and DeltaSol A. These controllers form the central electronic layer of a solar-thermal system, helping manage energy collection and safe circulation.
Solar-thermal pump station
FlowCon Pro
FlowCon Pro is an integrated pump-station product for solar-thermal installations. It was recognized with an iF Design Award and an ISH Design Plus Award, indicating an emphasis on both functional integration and equipment design. The available material does not specify its complete technical configuration or current availability.
Solar-thermal pump station
FlowCon D
FlowCon D is a RESOL pump station cited as receiving iF design recognition in 2008. It belongs to the company's integrated hydraulic equipment range for solar-thermal systems. Detailed specifications, target segments, and current production status are not established by the supplied sources.
Solar-thermal pump station
FlowCon S
FlowCon S is a pump-station product associated with RESOL's solar-thermal equipment portfolio. It was among the company's products cited as receiving Red Dot design recognition. The available reference does not provide further technical details or a current product listing.
Sensor-equipped solar-thermal pump station · 2009
FlowCon Sensor
FlowCon Sensor is a RESOL pump station incorporating sensor-related functionality for solar-thermal system operation. It was presented as a newly developed product at Intersolar in Munich in 2009 and received an Intersolar Award in the solar-thermal category.
Solar controller
RS600 MIDI
RS600 MIDI is a RESOL solar controller cited among the company's Red Dot-recognized products. It represents the brand's focus on electronic regulation for solar-thermal installations. The supplied sources do not give detailed specifications or current availability.
Solar controller
DeltaSol A
DeltaSol A is a RESOL solar controller included among the products recognized by the Red Dot design program. It belongs to the company's controller portfolio for managing solar-thermal systems. No reliable current product information is provided in the reference material.
Brand decisions
2007
Expansion of Hattingen production and office capacityStrategyBackground
RESOL's growth created a need for additional manufacturing and administrative space.
Action taken
The company added another building at its Hattingen site and subsequently planned an extension to the original plant.
Aftermath
The planned construction was expected to bring total plant and office space to approximately 6,600 square metres when completed.
2005
Adoption of synchronous production and process managementStrategyBackground
RESOL was growing rapidly and needed to move beyond a small-scale manufacturing model.
Action taken
The company worked with a specialist consultancy to introduce process management based on synchronous production principles influenced by the Toyota Production System. Assembly lines, workplace layouts, process chains, and cycle times were revised.
Aftermath
The referenced account credits the program with turning assembly into a more flexible industrial operation and with contributing to more than fourfold growth in turnover. The stated result is historical and lacks a current independent financial update.
Reported turnover increase following synchronous-production implementation. More than 400% increase (After implementation beginning in 2005; exact comparison years not specified)
Recent events
- 2009
FlowCon Sensor wins Intersolar Award[1]
Product launch · Other
The newly developed FlowCon Sensor pump station was presented with an Intersolar Award in the solar-thermal category at the Intersolar trade fair in Munich.
- 2008
FlowCon D receives iF design recognition[1]
Other
The FlowCon D pump station received an iF design award, extending RESOL's record of design recognition.
- 2005
RESOL begins process-management transformation[1]
Other
The company introduced structured process management and synchronous-production methods to make assembly more flexible and industrially efficient.
- 2001
FlowCon Pro receives iF Design Award[1]
Other
RESOL's FlowCon Pro pump station received an iF Design Award for product design.
- 2000
RESOL receives Solar Company 2000 recognition[1]
Other
RESOL was recognized by the Solar-Unternehmen 2001+ initiative for its commitment to generating and using solar energy.
Sources1 sources
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