Linn High Therm
Linn High Temp GmbH is a German industrial furnace manufacturer founded in 1969 that designs and services custom high-temperature heating systems based on resistance, induction, microwave, and hybrid technologies (up to 2500°C) for industrial manufacturing, ceramics, chemical processing, and research laboratory customers globally.
- Company typePrivate
- Founded1969
- HeadquartersEschenfelden, Germany
- Headcount1–10
- GTM typeB2B
- OfferingHardware or Manufacturing
What Linn High Therm does
Linn High Temp GmbH (formerly Linn High Therm GmbH, rebranded in June 2023) is a privately-held German industrial equipment manufacturer founded in 1969 by Horst Linn and headquartered in Eschenfelden, Germany. The company designs, manufactures, and services custom-engineered high-temperature heating systems based on three core technologies: resistance heating (batch and continuous furnaces including front loaders, bottom loaders, tube furnaces, conveyor/belt furnaces, and rotary hearth kilns), induction heating (high and medium frequency generators, precision fine casting, and sample preparation for spectroscopy), and microwave/dielectric heating (laboratory units, high-temperature furnaces, continuous belt dryers). A distinguishing capability is the integration of these technologies into hybrid systems, with operating temperatures reaching up to 2500°C for specialized induction vacuum furnaces, including niche applications such as induction levitation melting for ultra-pure metals and rotary tube furnaces for rare earth and nuclear materials processing.
The company generates revenue through three primary streams: one-time sales of custom and semi-custom industrial furnace systems, aftermarket services including spare parts and sales/service training programs conducted at the Eschenfelden facility, and used/refurbished machinery sales providing entry-level options for smaller customers. All systems are custom-quoted based on specifications, capacity, temperature requirements, and automation level, with multi-year delivery and installation cycles typical. Go-to-market is sales-led, relying primarily on direct engagement at international trade shows (Thermprocess in Düsseldorf, Ceramitec in Munich, Achema in Frankfurt, SEMICON Taiwan, Powtech in Nuremberg, plus exhibitions in Brazil and China), supplemented by technical white papers and an application-organized website. Target customers span industrial manufacturing (automotive, foundries, precision components), ceramics and powder metallurgy, chemical and materials processing, research/laboratory facilities, and advanced materials applications including crystal growth and gemstone heat treatment.
The company operates with a small team of 1-10 employees, suggesting a specialist boutique operation. It has remained family-connected since founding, with Rudolf Linn continuing to appear in company materials following the November 2021 passing of founder Horst Linn sen. No external investment, parent company, or subsidiary structure is disclosed. The company maintains a European strategic partnership with SAFED, the French professional association for thermal equipment and furnace engineering, established in April 2018.
Linn High Therm firmographics
Firmographics- Name
- Linn High Therm
- Legal name
- Linn High Temp GmbH
- Website
- https://linn-high-therm.de
- Company type
- Private
- Founded year
- 1969
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Linn High Temp GmbH is a German industrial furnace manufacturer founded in 1969 that designs and services custom high-temperature heating systems based on resistance, induction, microwave, and hybrid technologies (up to 2500°C) for industrial manufacturing, ceramics, chemical processing, and research laboratory customers globally.
- Ownership category
- akta.pro rank
Linn High Therm industry classification
Industry- Product category
- Industrial Heating Equipment
- NAICS
- Industrial Process Furnace and Oven Manufacturing (333994)
- SIC
- Industrial Process Furnaces & Ovens (3567)
- akta.pro primary industry
- Industrial Furnaces, Kilns & Thermal Processing Equipment (IMAHAEAE)
Keywords
Where Linn High Therm is headquartered
LocationHeadquarters
- HQ city
- Eschenfelden
- HQ country
- Germany
- HQ region
- Europe
Offices1 record
Markets served
Linn High Therm business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Technology or R&D, Supply Chain, Marketing or Sales, Infrastructure
Revenue model
- Industrial Furnace Systems Sales: Direct sale of custom and semi-custom high-temperature heating equipment including resistance furnaces, induction heating systems, and microwave heating units. Systems range from laboratory-scale units to large-scale industrial production furnaces with multi-year delivery and installation cycles.
- Aftermarket Services and Parts: Sales and service training programs, spare parts, and technical support services for installed equipment base. The company conducts regular sales and service training sessions at their Eschenfelden facility.
- Used Machinery: Sale of refurbished and used high-temperature heating equipment providing entry-point options for smaller customers or replacement units for existing installations.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Custom quotation-based pricing |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels4 records
Linn High Therm product offering
Product offeringCore offering
Linn High Temp (formerly Linn High Therm GmbH, renamed June 2023) manufactures and services electrically heated industrial heat treatment units. The company engineers custom and semi-custom furnace systems across three primary heating technologies — resistance heating, induction heating, and microwave/dielectric heating — capable of reaching temperatures up to 2500°C. Products range from compact laboratory-scale units to large continuous production lines, supported by aftermarket parts, service training, and used machinery offerings.
Product overview
Linn High Temp GmbH (formerly Linn High Therm GmbH, renamed in June 2023) is a manufacturer of industrial heating systems founded in 1969, headquartered in Eschenfelden, Germany. The company offers a comprehensive portfolio of heating technologies organized into four core product lines: Resistance Heating Systems (batch and continuous furnaces including front loaders, bottom loaders, top loaders, tube furnaces, high pressure furnaces, conveyor/belt furnaces, roller/pusher furnaces, rotary hearth kilns, and rotary tube furnaces), Induction Heating Systems (high and medium frequency generators, precision fine casting, sample preparation for spectroscopy, and laboratory units), Microwave Heating Systems (laboratory units, high temperature furnaces, continuous belt dryers, and chamber dryers), and Hybrid Systems (combining multiple heating technologies). Additional offerings include Control Units for process automation and Used Machinery. The company also produces specific furnace models such as the FDHK series, HT-1800-GT-W Special, MDBT continuous belt dryer, KK-H and KS series furnaces, IT-KCH vacuum induction furnaces, Supercast precision casting systems, and the new Lifumat-M-Series with energy-efficient transistor technology.
Differentiator
Problem solved
Functional benefit
Products and services
- Resistance Heating Systems Industrial resistance heating furnaces including batch systems (front loaders, bottom loaders/elevators, top loaders, tube furnaces, high pressure furnaces, laboratory furnaces) and continuous systems (conveyor/belt furnaces, roller/pusher furnaces, rotary hearth kilns, rotary tube furnaces). Used for heat treatment processes in industrial manufacturing.
- Induction Heating Systems Induction heating equipment including high frequency generators, medium frequency generators, precision fine casting units, sample preparation systems for spectroscopy (fusion, remelting, fusion and remelting), and laboratory units. Includes specialized levitation melting technology for ultra-pure metals and alloys research.
- Microwave Heating Systems Microwave and dielectric heating equipment including laboratory units, high temperature furnaces, continuous belt dryers, and chamber dryers. Used for specialized drying and heating applications across industries.
- Hybrid Heating Systems Combined heating systems that integrate multiple heating technologies (resistance, induction, microwave) into a single system for specialized industrial applications requiring more than one heating method.
- Used Machinery Pre-owned Linn High Temp furnaces and heating equipment available for purchase, providing entry-point options for smaller customers or replacement units for existing installations.
- Control Units Furnace control and automation systems for managing heating processes, temperature regulation, and process monitoring, sold as part of the company's automation offering.
- FDHK Model Resistance Furnace Resistance heating furnace model available in lengths from 1500-5000 mm for industrial continuous heat treatment applications.
- HT-1800-GT-W Special High Temperature Furnace High temperature furnace reaching up to 2100°C with graphite felt insulation for specialized high-temperature processing applications.
- Supercast Precision Casting Furnace Precision casting furnace system for high-quality metal casting applications using induction heating technology.
- Lifumat-M-Series Induction Melting System New generation induction melting system with highly energy-efficient transistor technology, representing the company's latest advancement in induction melting systems.
- IT-GTV-160/200/2500-Vac Vacuum Induction Furnace Induction furnace with graphite felt insulation, gas- and vacuumtight design, Tmax 2,500°C, 4 l capacity, 50 Hz for high-purity material processing applications.
- VMK-250-Special Laboratory Chamber Furnace Laboratory chamber furnace with ASW insulation, gastight muffle, Tmax 1050°C for hydrogen operation in laboratory and research settings.
- VMK-135-S Special Laboratory Chamber Furnace Laboratory chamber furnace with ASW insulation, gas-tight muffle, Tmax 1050°C, 9.2 l capacity for calcination and sintering applications.
- IT-KCH-8-435x50-3000-950-S-VAC Induction Furnace Induction furnace with vacuum capability, graphite felt insulation, Tmax 3000°C for ultra-high temperature material processing.
- Aftermarket Services and Parts Sales and service training programs, spare parts, and technical support services for the installed base of Linn High Temp equipment, including regular training sessions at the Eschenfelden facility.
Quantifiable outcome
- Maximum operating temperature up to 2500°C for specialized induction furnace models
- +2 more outcomes
Companies that use Linn High Therm
Customer profileSegments5 records
Ideal customer profiles4 records
Linn High Therm technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
Linn High Therm partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- SAFEDcoreLinn High Temp announced a strategic cooperation with SAFED (the French professional association for thermal equipment and furnace engineering) in April 2018. The partnership between these two long-established companies in the thermal processing industry was announced as a significant collaboration for the European market.
Scale indicators2 records
Recent moves5 records
Expansion highlights5 records
Linn High Therm competitors and assessment
Company assessmentDirect peers
- Carbolite Gero: Manufacturer of laboratory and industrial high-temperature furnaces up to 3,000°C, including resistance and induction systems. Closely comparable in specialty high-temperature applications and laboratory-scale equipment.
- Thermal Technology LLC: US-based manufacturer of high-temperature vacuum and controlled-atmosphere furnaces for advanced materials, ceramics, and metallurgy. Directly comparable in vacuum/induction furnace technology targeting specialty industrial customers.
- Seco/Warwick: Manufacturer of industrial heat treatment furnaces, vacuum furnaces, and melting systems serving aerospace, automotive, and energy markets. Highly comparable product overlap with Linn's resistance and vacuum furnace lines.
- Ipsen International: Global manufacturer of industrial heat treatment furnaces and vacuum furnaces for aerospace, automotive, and medical applications. Closely comparable in core heat treatment furnace technology and customer base.
- BMI Fours Industriels: French manufacturer of industrial furnaces for heat treatment of metals, serving automotive, aerospace, and energy. Comparable European industrial furnace peer with similar custom-engineering profile.
- Nabertherm: German-based manufacturer of industrial and laboratory furnaces for heat treatment, ceramics, metallurgy, and materials processing. Directly comparable to Linn High Temp as a fellow German specialty furnace OEM serving overlapping industrial customer segments.
- ECM Technologies (now part of Ipsen): European industrial furnace specialist serving aerospace, medical, and energy markets with vacuum and controlled-atmosphere furnaces. Closely comparable in specialty high-temperature European industrial furnace manufacturing.
Broad incumbents
- Inductotherm Group: Largest global manufacturer of induction melting and heating equipment for metals processing. Overlaps with Linn's induction heating product line but at vastly greater scale and broader industrial scope.
- Surface Combustion: Established US manufacturer of industrial heat treatment furnaces and atmosphere systems. Comparable in batch and continuous heat treatment furnace technology, though broader product portfolio and larger installed base.
- Ajax Tocco Magnethermic: Global manufacturer of induction heating and melting systems for forging, heat treatment, and melting applications. Directly overlaps with Linn's induction product line at greater scale.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
Linn High Therm social profiles
Digital presenceLinn High Therm financial estimates
Financial estimateRevenue estimate
Valuation estimate
Linn High Therm leadership team
Management profileNumber of profiles
Linn High Therm funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Linn High Therm M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Linn High Therm
What does Linn High Therm do?
Linn High Temp (formerly Linn High Therm GmbH, renamed June 2023) manufactures and services electrically heated industrial heat treatment units. The company engineers custom and semi-custom furnace systems across three primary heating technologies — resistance heating, induction heating, and microwave/dielectric heating — capable of reaching temperatures up to 2500°C. Products range from compact laboratory-scale units to large continuous production lines, supported by aftermarket parts, service training, and used machinery offerings.
Is Linn High Therm a public or private company?
Linn High Therm is a private company. It is classified as family owned and is currently operating.
When was Linn High Therm founded?
Linn High Therm was founded in 1969. It employs 1 to 10 people.
Where is Linn High Therm based?
Linn High Therm is headquartered in Eschenfelden, Germany, in the Europe region.
How does Linn High Therm make money?
Three revenue lines are on record. Industrial Furnace Systems Sales are the primary driver. The others are aftermarket Services and Parts and used Machinery.
Who are Linn High Therm's main competitors?
Direct peers on record are Carbolite Gero, Thermal Technology LLC, Seco/Warwick, Ipsen International, BMI Fours Industriels, Nabertherm and ECM Technologies (now part of Ipsen). Broad incumbents are Inductotherm Group, Surface Combustion and Ajax Tocco Magnethermic.
Does Linn High Therm have an API?
No public API is recorded for Linn High Therm.
What industry is Linn High Therm in?
Linn High Therm's product category is Industrial Heating Equipment. Its primary akta.pro industry code is IMAHAEAE, Industrial Furnaces, Kilns & Thermal Processing Equipment. Its NAICS code is 333994 and its SIC code is 3567.