
Planning, installation and service of heating and heat pump systems in Thurgau since 1969.

Wittwer Heizungen AG
Sulgen (Kradolfstrasse 84), SwitzerlandNew on Amplifa
About Wittwer Heizungen AG
Wittwer Heizungen AG is a family-run heating company based at Kradolfstrasse 84 in Sulgen in the canton of Thurgau. The company was founded in 1969 by Werner Wittwer and has been led since 2005 by Marcel Wittwer, a trained heating installer and building services planner. Its activities include consulting, planning and execution of heating renovations, conversions and new installations as well as service, repairs, boiler replacements, minor sanitary installations and pipe insulation. The range extends from conventional gas and oil condensing boilers to heat pumps (brine-to-water with ground probes, air-to-water) to log-fired heating systems and heat distribution systems such as underfloor heating and radiators. Customers include private individuals as well as companies, municipalities and institutions in the region, including the municipality of Sulgen, HOCHDORF Swiss Nutrition AG and Thurgauer Kantonalbank. The company trains apprentices and is a member of the Suissetec professional association and the Wärmepumpen Schweiz (Swiss Heat Pump Association).
- Site
- Sulgen
- Processes
- Heating renovation, New heating installations, Conversions of heating systems, Heat distribution system installation, Modifications and extensions of existing heating systems, Heating system repairs, Boiler replacements / boiler service, Minor sanitary installations and maintenance work
- Materials
- Brine-to-water heat pump with ground probes, Air-to-water heat pump, Log-fired heating system NEO (Heitzmann), Gas and oil condensing boiler, Heat distribution systems
- Certificates
- Suissetec membership, Fachvereinigung Wärmepumpen Schweiz (Swiss Heat Pump Association), Impulse advisor «erneuerbar heizen» (heating with renewables), Permanent list of the Department of Construction and Environment, Canton Thurgau, Aach-Thur-Land trade association
- Founded
- 1969
- Industries
- Building services/heating installation, Private and commercial customers, Residential construction, Property management
- 01
Consulting and planning
- 02
Execution/installation
- 03
Service, repair and maintenance
Systems and Techniques
Brine-to-water heat pump with ground probes
Installation of heat pumps with ground probes for the use of renewable energy.
Air-to-water heat pump
Set-up and installation of air-to-water heat pumps in the building.
Log-fired heating system NEO (Heitzmann)
Installation of log-fired heating systems as an alternative, wood-based form of heating.
Gas and oil condensing boiler
Conventional condensing boilers for renovations and new installations.
Heat distribution systems
Underfloor heating, bathroom radiators and other heat distribution systems including pipe insulation.
Location
Sulgen
CHHeadquarters and operating site
- Materials
- Heat pumps, log-fired heating, gas/oil condensing, heat distribution systems
- Assembly and service equipment for heating technology
Systems and Components





Inside the production



Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Heating renovationAssembly | – | – | – | – | – |
| New heating installationsAssembly | – | – | – | – | – |
| Conversions of heating systemsAssembly | – | – | – | – | – |
| Heat distribution system installationAssembly | – | – | – | – | – |
| Modifications and extensions of existing heating systemsAssembly | – | – | – | – | – |
| Heating system repairsAssembly | – | – | – | – | – |
| Boiler replacements / boiler serviceAssembly | – | – | – | – | – |
| Minor sanitary installations and maintenance workAssembly | – | – | – | – | – |
| Pipe insulationAssembly | – | – | – | – | – |
| Heating technology consulting and planningEngineering | – | – | – | – | – |
| Gas and oil condensing boiler installationAssembly | – | – | – | – | – |
| Heat pump installationAssembly | – | – | – | – | – |
| Log-fired heating installation (NEO log-fired heating system by Heitzmann)Assembly | – | – | – | – | – |
| Brine-to-water heat pump with ground probes installationAssembly | – | – | – | – | – |
| Underfloor heating / bathroom radiator installationAssembly | – | – | – | – | – |
3 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Heat pump (brine-to-water, ground probes) | – | – | – | – | Sulgen, Switzerland |
| Log-fired heating system NEO | Heitzmann NEO | – | – | – | Sulgen, Switzerland |
| Gas or oil condensing boiler | – | – | – | – | Sulgen, Switzerland |
Additional services
Reference customers
Qualifications and Memberships
The company places great value on high-quality work, on-time execution and friendly customer service. Marcel Wittwer is a trained heating installer, building services planner, vocational trainer and examination expert with further training, among other things, at the Suissetec education centre.
| Evidence | Sulgen |
|---|---|
| Suissetec membership | |
| Fachvereinigung Wärmepumpen Schweiz (Swiss Heat Pump Association) | |
| Impulse advisor «erneuerbar heizen» (heating with renewables) | |
| Permanent list of the Department of Construction and Environment, Canton Thurgau | |
| Aach-Thur-Land trade association |
History
- 1969
Founded by Werner Wittwer, who ran the company together with his wife Yvonne Wittwer.
- 1996
Son Marcel Wittwer joins the company.
- 2005
Marcel Wittwer takes over the company.