Heat Treatment Ovens and Furnaces

Caltherm designs and manufactures heat treatment ovens and furnaces in the UK, custom built to your process, your components, and your compliance requirements. With over 40 years of thermal engineering expertise, we supply precision heat treatment systems to aerospace, automotive, and advanced manufacturing businesses across Britain and beyond.

Every system is designed, fabricated, and pre-commissioned at our Staffordshire facility, giving you complete quality control from concept to fully operational plant.

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Our Industrial Heat Treatment Ovens

Industrial Ovens

Industrial Furnaces

Spares, Repairs & Servicing

Heat Treatment Processes We Support

Our heat treatment ovens and furnaces are engineered for tight temperature uniformity and repeatable results across the full range of thermal processes:

Annealing. Controlled heating and cooling to soften materials, relieve internal stresses, and improve machinability.
Tempering. Precise, stable soak temperatures to reduce brittleness in hardened components while retaining strength.
Stress relieving. Uniform heating to remove residual stresses from welding, machining, or forming, protecting dimensional stability.

Hardening. High-temperature systems with accurate control for consistent hardness and wear resistance.
Ageing (precipitation hardening). Long-duration, stable cycles for aluminium T5/T6 ageing and aerospace alloys.

Not sure which process or system your application needs? Our guide to the top five heat treatment processes explains each in detail, or speak to our engineers directly.

Why Choose Caltherm for Your Heat Treatment Oven Needs

Over 40 years as a UK industrial oven and furnace manufacturer
Fully bespoke design using 3D CAD, built and pre-commissioned in-house
AMS2750H and Nadcap compliance capability
Energy-efficient designs that reduce operating costs
Full lifecycle support: installation, commissioning, training, and maintenance

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Key Features of Caltherm Heat Treatment Ovens

Operating temperatures up to 1300°C
Class-leading air temperature uniformity, typically ±3°C or better where specified
Gas or electric heating
Multi-zone temperature control available
Solid state relay (SSR) element control as standard
Advanced insulation for industry-leading thermal efficiency and low external case temperatures
Optional airflow monitoring, load thermocouples, and data logging for full traceability
Automation and product handling systems available

Industries Served

Aerospace. Heat treatment and ageing systems for Prime and Tier 1 manufacturers, built to strict material property requirements.
Automotive. Repeatable hardening, tempering, and stress relieving for high-volume component production.
Composites. Precision thermal processing for advanced materials.
Pharmaceutical. Controlled, compliant heating systems.
General manufacturing. Custom solutions for metals, ceramics, and beyond.

AMS2750H and Nadcap Compliance

Supplying aerospace or defence customers? Caltherm manufactures heat treatment ovens and furnaces to AMS2750H requirements and supports Nadcap accreditation, including temperature uniformity surveys (TUS), system accuracy tests (SAT), and instrumentation classes to suit your specification. All equipment is CE and UKCA marked.

Learn more about our AMS2750H and Nadcap compliance.

Choosing the Right Heat Treatment Oven

When specifying a system, our engineers will work through the following with you:

Maximum temperature requirements
Size and load capacity
Materials to be treated
Heat treatment processes required
Production volume (batch or continuous)
Uniformity and compliance requirements
Energy efficiency targets
Automation and handling needs

Maintenance and Support

At Caltherm, we offer comprehensive maintenance and support services to ensure the longevity and optimal performance of your heat treatment equipment. Our services include:

Regular maintenance checks
Calibration services
Spare parts supply
Technical support
Operator training

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Popular FAQs

What is a heat treatment oven used for?

Heat treatment ovens and furnaces alter the physical and mechanical properties of materials, primarily metals. They are used for annealing, tempering, hardening, stress relieving, and ageing across industries such as aerospace, automotive, and general manufacturing.

What is the difference between a heat treatment oven and a furnace?

The distinction is largely temperature. Ovens typically operate up to around 500°C, while furnaces handle higher temperature processes up to 1300°C, such as hardening and annealing of steels. Caltherm manufactures both, so we can specify the right system for your process.

Can you customise a heat treatment oven for my specific needs?

Yes. Every Caltherm system is custom built. Chamber size, temperature range, heating method, airflow, controls, and automation are all tailored to your exact requirements.

Do you supply AMS2750H compliant heat treatment furnaces?

Yes. We design and manufacture systems to AMS2750H and support Nadcap accreditation, including the instrumentation, uniformity, and documentation requirements aerospace customers need.

Should I choose gas or electric heating?

Both are available. The right choice depends on your process temperatures, energy costs, site infrastructure, and sustainability goals. Our engineers will advise on the most efficient option for your application.

Do you offer servicing and maintenance?

Yes. We provide maintenance checks, calibration, spare parts, technical support, and operator training to keep your heat treatment equipment compliant and performing at its best.

Contact Caltherm Today

Experience the difference a precision-built heat treatment oven or furnace can make to your manufacturing processes. Contact us today to discuss your requirements with our expert team, and receive a response within 24 hours.