Thermocable

What Thermocable does

Thermocable (Flexible Elements) Limited, founded in 1963 in Bradford, United Kingdom, manufactures linear heat detection (LHD) cable systems sold under the ProReact brand. The company's technology rests on two core product lines: ProReact Fixed Activation, a non-resettable two-core cable whose temperature-sensitive polymer melts at predefined thresholds (68°C, 78°C, 88°C, 105°C, 185°C, or 230°C for the VHT variant) to trigger an irreversible alarm; and ProReact Programmable Temperature Sensing / Analogue, a resettable four-core cable that continuously monitors resistance changes along its length, enabling precise temperature tracking, pre-alarm functionality, and ambient temperature compensation. The portfolio also includes complementary offerings such as ProH2O water leak detection, ProMinder monitored trace heating, ProAlert perimeter protection, and flexible heating wire for medical respiratory applications, with interface modules (DiMM, APDL) enabling integration with conventional and addressable fire panels. The company holds multiple international certifications including the first EN 54-28 and EN 54-22 approvals in Europe, alongside UL 521, FM Class 3210, VdS, CNBOP, ISO 9001:2015, CE, and UKCA.

Thermocable sells project-direct to enterprise customers in four target verticals: Energy (solar PV, hydrogen, transformers, switchgear), Oil & Gas (upstream/midstream/downstream, floating and fixed roof tanks), Industrial (conveyor belts, recycling, marine, warehouse racking), and Infrastructure (data centres, cold storage, car parks, tunnels, scaffolding) — with Infrastructure identified as the primary growth vertical. Pricing is quote-based and project-specific, driven by cable type, length, activation temperature, coating requirements, and integration complexity, typically under multi-year contracts. Go-to-market is enterprise field sales supported by trade show presence (Intersec, FIREX, Security Essen, OFSEC, Facilities Show), an extensive case-study library, and industry association memberships (FIA, EIC, BAFSA, FPA training). Customers are global, with named references spanning the UK, Europe, Middle East, Australia, South Africa, Hong Kong, and the USA.

In February 2023, Thermocable was acquired by Halma plc (FTSE 100), a global group of life-saving technology companies, and now operates within Halma's Apollo Group alongside Apollo Fire Detectors. Post-acquisition, the company has expanded headcount by 15.3%, appointed a new General Manager, and in 2025 moved into a 39,435 sq ft facility at Leftfield Park in Bradford to support a stated ten-year growth plan. Co-development with Ramtech in 2025 for cladding-remediation scaffolding fire detection and ongoing extension into water leak detection and trace heating indicate continued product and vertical expansion under Halma ownership.

Name

Thermocable

Legal name

Thermocable (Flexible Elements) Limited

Website

https://thermocable.com

Company type

Private

Founded year

1963

Operating status

Operating

Headcount range

1–10 employees

Short description

Thermocable is a Bradford, UK-based manufacturer of linear heat detection cable systems for fire detection across industrial, infrastructure, energy, and oil & gas sectors. Acquired by Halma plc in 2023, the company sells globally via direct enterprise field sales.

Ownership category

akta.pro rank

Product category

Linear Heat Detection Systems

NAICS

Other Measuring and Controlling Device Manufacturing (334519)

SIC

Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Fire-Resistant & Life-Safety Cable (Fire Alarm/Emergency) (IMADAMAF)

akta.pro secondary industries

Fire Detection & Suppression Systems (HDABAKAI), Electrical Heat Tracing & Insulation (EHT, Thermal/Acoustic Insulation) (EUAEAFAI)

Keywords

• Linear heat detection
• Fire detection cables
• Industrial fire safety
• Heat sensing systems
• Linear fire detectors

Headquarters

HQ city

Bradford

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Linear Heat Detection Cable Systems (ProReact): Sale of ProReact linear heat detection cable products across Fixed Activation, Programmable Temperature Sensing, EN Digital, EN Analogue, and VHT variants. Products are sold with various coatings (LSZH, PVC, Nylon, stainless steel braiding) suited to different environments. Revenue is project-based and driven by industrial/infrastructure fire safety compliance requirements.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Thermocable manufactures linear heat detection (LHD) cables and monitoring systems under the ProReact brand, used for fire detection across industrial, infrastructure, energy, and oil & gas environments. The product range includes Fixed Activation (non-resettable two-core cable with temperature-sensitive polymer) and Programmable Temperature Sensing/Analogue (resettable four-core cable with continuous resistance monitoring), with specialised variants for EN 54-28, EN 54-22, and very high-temperature (VHT) applications. Complementary offerings include water leak detection (ProH2O), trace heating (ProMinder), perimeter security (ProAlert), and flexible heating wire for medical applications.

Product overview

Thermocable is a world-leading manufacturer of linear heat detection systems, offering two primary technology lines: ProReact Fixed Activation (non-resettable, two-core cable with temperature-sensitive polymer) and ProReact Programmable Temperature Sensing (resettable, four-core cable with continuous resistance monitoring). The product portfolio includes multiple variants such as ProReact EN Digital, ProReact EN Analogue, ProReact Plus Digital, and ProReact VHT, all designed for fire detection across diverse environments. Additional complementary products include ProH2O water leak detection, ProMinder thermal protection, ProAlert perimeter security, and flexible heating wire for medical applications. Interface modules like the DiMM and APDL controller enable integration with fire alarm panels and addressable systems.

Differentiator

Problem solved

Functional benefit

Products and services

• ProReact Fixed Activation Non-resettable two-core linear heat detection cable using temperature-sensitive polymer that melts at predefined thresholds (68°C, 78°C, 88°C, 105°C, or 185°C), triggering an irreversible alarm. Designed for high-risk, long-distance applications where rapid detection is critical. Available with multiple coatings (LSZH, PVC, Nylon) and optional stainless steel braiding for mechanical protection.
• ProReact Fixed Activation (EN) EN 54-28 certified non-resettable linear heat detection cable variant approved to European standards. UL and EN approved with LSZH coating, UV stability, and hydrocarbon resistance. First and only digital LHD cable approved to EN 54-28:2016 in Europe.
• ProReact Fixed Plus Fixed temperature activation linear heat detection cable with enhanced features, available as a low smoke zero halogen (LSZH) alternative to traditional fixed temperature LHD. Flame retardant and highly oil and fuel resistant for harsh environments, with activation temperatures of 65°C, 75°C, 85°C, 100°C, and 110°C. cUL/UL521 approved.
• ProReact Very High Temperature (VHT) Digital LHD cable designed for environments exposed to extremely high temperatures, with 230°C activation temperature and continuous operation up to +170°C. Approved to UL521 and FM Class 3210 standards. Designed for commercial cooker hoods and vehicle engine bays.
• ProReact Programmable Temperature Sensing Resettable four-core cable that continuously monitors resistance changes along its length for precise temperature tracking and early warning capabilities. Features ambient temperature compensation and pre-alarm functionality. Ideal for environments with gradual temperature changes such as tunnels, car parks, and solar PV installations.
• ProReact EN Analogue EN 54-22 certified resettable line-type heat detector - the first resettable linear heat detector approved to EN54 standards. Approved as Class A1I, A2I and BI heat detector. Features automatic ambient temperature adjustments to reduce false alarms. Also VdS approved (G 220006) and CNBOP certified.
• ProH2O Water Leak Detection Linear water leak detection system that connects to ProH2O water leak detection cable. When cable contacts water, the monitor triggers an alert and notifies users via SMS and email. Includes remote monitoring capabilities.
• ProMinder Thermal Protection Monitored trace heating systems providing year-round protection against frost and ice build-up to sprinkler systems. Conforms to BS EN62395-1:2013.
• ProAlert Perimeter Protection Linear security system for perimeter protection applications.
• Flexible Heating Wire Flexible heating wire technology used in respiratory circuits for medical applications, including incubator care for premature babies. Manufactured at the Bradford facility.

Quantifiable outcome

• c85% energy consumption reduction and c50% heating decrease through ESG improvements (office renovations and supply chain process)
• +4 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration6 records

Feature7 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• RamtechcoreStrategic or Co-development Partner · 1 January 2025Thermocable and Ramtech collaborated to develop an innovative 'linear fire detection system' specifically for scaffolding structures in cladding remediation projects. The system combines Thermocable's ProReact Fixed Activation LHD with Ramtech's WES3 and REACT systems, adding fire detection with remote monitoring, medical and evacuation features. This was driven by post-Grenfell fire safety needs in occupied buildings undergoing remediation.
• Apollo Group (Halma subsidiary)coreOthersThermocable operates within the Apollo Group, one of Halma'sfire detection and alarm company clusters. Apollo Group includes companies like Apollo Fire Detectors. Thermocable's linear detection products complement Apollo's existing fire detection and alarm systems for industrial and commercial customers.
• Heart Research UKminorOthersThermocable's corporate charity partnership. Heart Research UK is the company's chosen corporate charity, aligning with the company's mission of making the world safer.
• Fire Industry Association (FIA)minorOthersThermocable joined the Fire Industry Association (FIA), a network of over 700 members including manufacturers and fire safety integrators in the UK. Membership supports promoting fire safety, providing technical support, and influencing relevant standards and legislation.
• The EIC (Energy Industries Council)minorOthersThermocable became a member of the EIC, the leading trade association for UK companies supplying goods and services to the energy industries worldwide. Supports international business development and networking within the energy sector.
• BAFSA (British Automatic Fire Sprinkler Association)minorOthersThermocable joined BAFSA through development of the ProMinder Monitored Trace Heating range. BAFSA's objectives include providing authoritative information on sprinkler benefits and fire safety advocacy.
• Fire Protection Association (FPA)minorOthersProReact Digital and Analogue linear heat detection products were installed at the FPA training facility at the Fire Service College in Moreton-in-Marsh, England. Allows engineers and end-users to be trained on installation, operation, and maintenance of linear heat detection products.
• Minicam (Halma subsidiary)minorOthersThermocable visited Minicam (Halma company) for strategic team-building. Minicam is a specialist in remote pipeline monitoring equipment. Visit included strategy planning, SWOT analysis, and sharing best practices. Minicam has been part of Halma since 2017.

Scale indicators6 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Honeywell Building Technologies: Global building safety incumbent offering broad fire detection, alarm, and building management systems. Owns the Protectowire LHD brand and competes with Thermocable at the systems-integration level across industrial and commercial projects.
• Johnson Controls: Global fire safety and building systems incumbent, including the Tyco/Notifier product lines. Competes with Thermocable in industrial and infrastructure specifications, offering broad fire detection portfolios that may include or specify against LHD cable.
• Siemens Smart Infrastructure: Global building safety and automation incumbent with extensive fire detection portfolios. Addresses many of the same industrial, infrastructure, and data centre customers as Thermocable, though typically via panel and point-detector architectures rather than LHD cable.
• Kentec Electronics: UK-based manufacturer of fire detection control panels and extinguishing control equipment. Complementary to Thermocable's LHD cable (panels integrate with detection devices), and addresses overlapping UK and international fire safety specifications.
• Hochiki Europe: Major fire detection manufacturer with a broad analogue and addressable portfolio including point heat detectors. Competes with Thermocable in industrial and commercial fire detection specifications but does not specialise in linear heat detection cable.
• FFE Limited: UK-based fire detection specialist known for the Fireray beam smoke detection range. Addresses similar industrial and infrastructure customers as Thermocable, with overlapping specification opportunities but different core detection technology.

Direct peers

• Patol Ltd: UK-based specialist manufacturer of linear heat detection and fire detection cable systems. Competes with Thermocable in similar industrial, transport, and energy sectors, particularly in the UK and European markets.
• Apollo Fire Detectors: Sister company within Halma's Apollo Group cluster. Manufactures addressable and conventional fire detection devices (smoke, heat, multi-sensors) and integrates with Thermocable's ProReact LHD via the Apollo Mini-Switch Monitor Module, making it both a peer and a key integration partner.
• Protectowire: Long-established US-based manufacturer of linear heat detection cable, now operating under the Honeywell umbrella. Most direct product-for-product competitor to Thermocable's ProReact range, addressing the same industrial, oil & gas, and infrastructure fire detection applications.

Emerging players

• Eurofyre: UK-based specialist in fire detection, distributing and integrating LHD cable solutions alongside other detection technologies. Competes with Thermocable for specification wins in industrial and infrastructure projects, though primarily as a systems integrator rather than a cable manufacturer.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/thermocable-flexible-elements-ltd

Compliance13 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 Thermocable