
Planning, manufacturing, installation and service of thermal oil systems, electric heaters and heat transfer systems.

heat 11 GmbH & Co. KG
Bielefeld · Kirchlengern · Rödinghausen-Bruchmühlen · Ebersbach a. d. Fils · Kraków · ShanghaiNew on Amplifa
Heat Transfer with Passion
heat 11 is a plant manufacturer specialising in heat transfer technology, based in Bielefeld. The company plans, manufactures, installs and services thermal oil systems, electric heaters, fired heaters, heating-cooling systems, secondary circuits, steam generators, waste heat boilers, pump groups and container systems for industrial process heat – partly also as turnkey solutions. The systems cover a temperature range of −100 to +560 °C; thermal oil, steam, hot water and molten salts are used as heat transfer media. In addition, waste heat boilers and heat recovery systems are offered. The service portfolio includes engineering, system manufacturing, installation, commissioning, training, maintenance, inspection in accordance with DIN 4754 as well as replacement and retrofit solutions and a 24/7 emergency service. With electric heaters and heating-cooling systems, heat 11 also supplies major projects in HDPE production. Production is certified to ISO 9001:2015, DIN EN ISO 3834-2 and AD-2000 HP0 and can be approved under foreign codes and standards (e.g. ASME, China Stamp AQSIQ). Further locations are in Kirchlengern, Bruchmühlen, Ebersbach, Kraków and Shanghai.
- Site
- Bielefeld
- Processes
- Thermal oil systems / heat transfer systems (planning, manufacturing, installation, commissioning), Electric heaters, Fired heaters, Heating-cooling systems / temperature control units, Secondary circuits, Steam generators (heated by thermal oil), Heat recovery / waste heat boilers / combustion air preheaters, Pump groups
- Materials
- Thermal oil (organic heat transfer fluid, mineral/synthetic), Molten salts, High-density polyethylene (HDPE), Thermal oil (organic heat transfer fluid), Steam and hot water
- Certificates
- ISO 9001:2015, DIN EN ISO 3834-2, AD-2000 HP0, CML (Chinese manufacturing licence, AQSIQ) for electric heaters and, ISO 9001, Other – DIN EN ISO 3834-2, Other – AD-2000 HP0, Other – CML (China, AQSIQ)
- Industries
- Chemicals/petrochemicals, Plastics industry, Paper industry, Wood and furniture industry, Food/beverages, Oil & gas/refineries
- 01
Engineering and system conception
- 02
Manufacturing (welding, piping and vessel construction)
- 03
Installation or complete installation
- 04
Commissioning
- 05
Maintenance, inspection and retrofit
Materials and Processes
Thermal oil (organic heat transfer fluid)
Mineral and synthetic heat transfer media for unpressurised process heat up to approx. 350 °C.
Steam and hot water
Alternative heat transfer media for plant engineering.
Molten salts
Heat transfer medium for operating temperatures far above 500 °C, among others in speciality chemistry and the basic materials industry.
Manufacturing and Office Locations
Bielefeld
DEHeadquarters, engineering and administration
- Materials
- Thermal oil, steam, hot water, molten salts

Kirchlengern
DEManufacturing (heat 11 manufacture)
- Materials
- Thermal oil, molten salts
- 2 overhead cranes (up to 10 tonnes load each)
- Electric heater manufacturing
- Heating-cooling system manufacturing
- Final assembly of secondary circuits and modules
Rödinghausen-Bruchmühlen
DEManufacturing
Ebersbach a. d. Fils
DESouthern office
Kraków
PLBranch office (heat 11 Polska Sp. z o.o.)
Shanghai
CNSubsidiary (heat 11 China Ltd.)
Systems and Components






Inside the production







Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Thermal oil systems / heat transfer systems (planning, manufacturing, installation, commissioning)Engineering | – | – | – | – | Thermal oil, Molten salts |
| Electric heatersEngineering | – | – | – | – | – |
| Fired heatersEngineering | – | – | – | – | – |
| Heating-cooling systems / temperature control unitsEngineering | – | – | – | – | – |
| Secondary circuitsEngineering | – | – | – | – | – |
| Steam generators (heated by thermal oil)Engineering | – | – | – | – | – |
| Heat recovery / waste heat boilers / combustion air preheatersEngineering | – | – | – | – | – |
| Pump groupsEngineering | – | – | – | – | – |
| Container systemsEngineering | – | – | – | – | – |
| Turnkey plant constructionEngineering | – | – | – | – | – |
| Molten salt systems / liquid salt systemsEngineering | – | – | – | – | Molten salts |
| Welding technology / pipe forming, sheet metal and forming technology (pressure vessel and pipingJoining | – | – | – | – | – |
| Installation, commissioning, maintenance, servicing, inspection & testing (DIN 4754, VDI 3033)Assembly | – | – | – | – | – |
| Extruder heating (electric heaters and heating-cooling systems for HDPE production)Engineering | – | – | – | – | Polyethylene (HDPE) |
11 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Electric heater | heat 11 | – | 50 – 10,000 kW (company website); alternatively stated 10–1,200 kW | – | Kirchlengern |
| Fired heaters / thermal oil boilers | heat 11 | – | 90 – 30,000 kW | – | Kirchlengern |
| Heating-cooling systems / temperature control units | heat 11 | – | Temperature range −100 to +560 °C | – | Kirchlengern |
| Waste heat boilers / waste heat systems (WHRU) | heat 11 | – | – | – | Kirchlengern |
| Steam generators (heated by thermal oil) | heat 11 | – | – | – | Kirchlengern |
| Pump groups | heat 11 | – | compact, pre-piped | – | Kirchlengern |
| Container systems | heat 11 | – | – | – | Kirchlengern |
| Overhead crane | – | 2 | up to 10 tonnes load each | – | Kirchlengern |
| Heating unit for perforated plate (electric heater) | heat 11 | – | Power 900 kW | – | Kirchlengern |
| Heating unit for screen changer (electric heater) | heat 11 | – | Power 560 kW | – | Kirchlengern |
| Heating-cooling unit for gear pump | heat 11 | – | 40 kW heating, 235 kW or 420 kW cooling capacity | – | Kirchlengern |
Additional services
Reference customers
Quality Management
heat 11 is certified to ISO 9001:2015, DIN EN ISO 3834-2 and AD-2000 HP0. Upon request, foreign codes and standards such as ASME U-Stamp/S-Stamp as well as the SQL/CML licence (China Stamp, AQSIQ) are taken into account.
| Evidence | Bielefeld | Kirchlengern | Rödinghausen-Bruchmühlen |
|---|---|---|---|
| ISO 9001 | |||
| Other – DIN EN ISO 3834-2 | |||
| Other – AD-2000 HP0 | |||
| Other – CML (China, AQSIQ) |
History
- 2004
Foundation of heat 11.
- 2016
Addition of molten salt systems to the product portfolio after around 200 projects in over 30 countries.
- 2017
Order for electric heaters and heating-cooling systems for a major HDPE plant on the US Gulf Coast.
- 2019
Completion of ISO 9001:2015 certification in April.