Linn High Therm

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.

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

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

• Industrial furnace manufacturing
• High-temperature heating
• Induction heating systems
• Resistance heating furnaces
• Microwave heating equipment

Headquarters

HQ city

Eschenfelden

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Technology or R&D, Supply Chain, Marketing or Sales, Infrastructure

Revenue model

1. 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.
2. 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.
3. 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

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core 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

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• SAFEDcoreStrategic or Co-development Partner · 10 April 2018Linn 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

Direct 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

• YouTubeyoutube.com/user/Andreas2350
• Facebookfacebook.com/pages/Linn-High-Therm-GmbH/157882084262190
• LinkedInlinkedin.com/company/linn-high-therm

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Linn High Therm