Specialist company for heating, sanitary, climate control and ventilation technology with system planning, installation, maintenance and emergency service in Hagen.
Frettlöh GmbH
HagenNew on Amplifa
About Frettlöh GmbH
Frettlöh GmbH, founded in 1960, is a specialist company for energy and building technology based in Hagen. The company with 27 employees plans, installs and maintains heating systems including heat pumps, gas and oil condensing technology, sanitary systems for private and commercial customers, solar thermal systems as well as climate control and ventilation technology. The range of services includes bathroom renovation, commercial pipework, refrigeration technology, lifting stations and backflow protection as well as a customer service department with emergency service for heating, sanitary, climate control, ventilation and solar. For commercial customers, property management companies, public administration, healthcare and industry, the company offers system planning and conception of technical systems for heat, air, water and electricity as well as energy and cost optimization with the IBS control system for energy management and plant operation. Since 2021, the company has been a member of the nationwide specialist company cooperation CELSEO. Customers include private customers, small and medium-sized enterprises as well as industrial companies in the Hagen region.
- Site
- Hagen
- Processes
- Heating installation (heating construction), Heating maintenance and repair (gas, oil, heat pump), Bathroom renovation and bathroom construction (sanitary installation), Commercial sanitary installation (pipework, sanitary systems), Installation, maintenance and repair of air conditioning systems (split units, multi-split, VRF), Ventilation system installation, maintenance, filter cleaning, Solar thermal system installation and maintenance, Heat pump installation (including cascades, e.g. Viessmann Vitocal 250-A)
- Materials
- Heat pump technology, Gas and oil condensing technology, Solar thermal, Climate control, ventilation and refrigeration technology, Energy management (IBS control system)
- Certificates
- CELSEO specialist company cooperation
- Founded
- 1960
- Employees
- 27
- Industries
- Private customers, Commercial customers / small and medium-sized enterprises, Property management companies, Industrial companies, Public administration, Healthcare
- 01
System planning and conception
- 02
Consulting and calculation
- 03
Installation and assembly
- 04
Customer service, maintenance and emergency service
- 05
Energy and cost optimization
Services and Technologies
Heat pump technology
Installation of heat pumps including cascade solutions, e.g. Viessmann Vitocal 250-A.
Gas and oil condensing technology
Installation of gas and oil heating systems with hot water tanks for residential and commercial buildings.
Solar thermal
Systems for hot water generation as a supplement to conventional heat generation.
Climate control, ventilation and refrigeration technology
Split and VRF air conditioning systems, ventilation systems and cooling systems including maintenance.
Energy management (IBS control system)
Monitoring, recording and control of building parameters for administration, healthcare and industry.
Locations
Hagen
DEHeadquarters / workshop
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Heating installation (heating construction)Assembly | – | – | – | – | – |
| Heating maintenance and repair (gas, oil, heat pump)Assembly | – | – | – | – | – |
| Bathroom renovation and bathroom construction (sanitary installation)Assembly | – | – | – | – | – |
| Commercial sanitary installation (pipework, sanitary systems)Assembly | – | – | – | – | – |
| Installation, maintenance and repair of air conditioning systems (split units, multi-split, VRF)Assembly | – | – | – | – | – |
| Ventilation system installation, maintenance, filter cleaningAssembly | – | – | – | – | – |
| Solar thermal system installation and maintenanceAssembly | – | – | – | – | – |
| Heat pump installation (including cascades, e.g. Viessmann Vitocal 250-A)Assembly | – | – | – | – | – |
| Oil heating systems with hot water tanks (installation)Assembly | – | – | – | – | – |
| Gas heating systems with hot water tanks (installation)Assembly | – | – | – | – | – |
| Refrigeration technology (cooling systems, e.g. for data centers)Assembly | – | – | – | – | – |
| Lifting station installation and maintenance (wastewater lifting stations)Assembly | – | – | – | – | – |
| System planning and conception of technical systems (heat, air, water, electricity)Engineering | – | – | – | – | – |
| Energy and cost optimization / energy management (IBS control system)Engineering | – | – | – | – | – |
| Maintenance and service in plant engineering (commercial)Assembly | – | – | – | – | – |
| Emergency service for heating, sanitary, climate control, ventilation and solarAssembly | – | – | – | – | – |
| Hydraulic balancing and heating modernizationAssembly | – | – | – | – | – |
| Water treatment (filters, water softeners, heating protection, BWT products)Assembly | – | – | – | – | – |
| Underfloor heating installation (Danfoss Icon control)Assembly | – | – | – | – | – |
2 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Air conditioning systems (VRF/split systems, installed at customer site) | Panasonic (split air conditioning unit) | – | – | – | Hagen |
| Heat pump cascade (2 heat pumps) | Viessmann Vitocal 250-A | 2 | – | – | Hagen |
Additional services
Quality and Network
Employees regularly attend training and further education courses; as a CELSEO member, the company works with tested brand products and proven solutions. The customer service team is equipped with modern diagnostic devices and works according to recognized technical standards.
| Evidence | Hagen |
|---|---|
| CELSEO specialist company cooperation |
Company History
- 1960
Company founded by Karl-Heinz Frettlöh; first company premises at Am Berge 40a in Hagen.
- 1985
25th company anniversary.
- 1993
Rainer kleine Kamphake and Bernd Schmitz take over the management.
- 1997
Company founder Karl-Heinz Frettlöh leaves the company.
- 1999
Relocation to Henkhauser Straße 23 in Hagen.
- 2010
50th company anniversary.
- 2013
Nikolai Klingenspohr joins the company as an employee.
- 2016
Bernd Schmitz leaves the company.
- 2017
Rainer kleine Kamphake and Nikolai Klingenspohr jointly take over the management.
- 2018
Relocation to Alemannenweg 16-18 in Hagen.
- 2021
Membership in CELSEO, a network of specialist companies.