Cast Aluminium Heater Manufacturer UK | Custom Cast Heaters

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How Soloheat manufactures cast alloy heaters

Every cast heater begins with a bespoke tubular heating element designed specifically for the required wattage, voltage and temperature profile. The element is precision formed before being securely located within the sand mould or steel die tool. Molten cast aluminium or aluminium bronze is then poured around the heating element, creating a single, solid casting that provides excellent heat transfer and long-term reliability. Once cast, each heater is fettled, machined on all critical faces, terminated electrically & hydraulically, and finally electrically tested & pressure tested on any cooling circuits.

Bespoke Assembly & Production Efficiencies

At Soloheat, we don’t just manufacture standard replacement parts—we actively engineer thermal solutions designed to optimise your workflow. In addition to producing standard machinery cast heating elements, our design engineers can assist clients to create bespoke cast heaters to fit specific components and tooling which facilitates streamlined machinery maintenance and assembly. This can be witnessed by the likes of our clients such as Airbus, Mercedes-AMG Petronas F1, European Space Agency and many more globally recognised Firms.

Whether fitted to an OEM’s machine barrel, integrated into precision dies & moulds or complex industrial manifolds, our custom-fit heating elements are engineered to enhance your overall production efficiency and ensure absolute thermal uniformity across the entire barrel or tool surfaces.

Typical Applications & Core Industries

Our robust cast-in heating elements are globally specified across high-stakes engineering sectors requiring strict adherence to tight tolerances. They are ideally suited for:

Aerospace Engineering: Specialised heating elements tailored for composite curing, tool & component heating, and components required for rigorous aerospace manufacturing standards.
Petrochemical Processing: High-durability, cast-in thermal solutions built to withstand corrosive environments (on-shore & off-shore) and demanding fluid-handling applications.
Plastics & Extrusion: Extrusion and injection moulding barrels & die tools, transfer pipes, and fluid processing lines.
Packaging Machinery: Extrusion die blocks, heated platens, packaging machinery jaws, and heat-sealing tools.

Soloheat specialises in the custom design and manufacture of high-performance cast aluminium heaters and cast aluminium bronze heaters. Operating from our facility in Gloucestershire, we operate the UK’s sole remaining dedicated cast-alloy industrial heating-element foundry.

Engineered for exceptional durability, uniform heat distribution, and extended operational lifespans, our cast alloy heaters are built to withstand heavy-duty industrial processing environments without compromising on performance.

Key Technical Capabilities

When your machinery requires maximum reliability and precise thermal control, our bespoke cast-in elements provide superior power density compared to standard band heaters.

Extreme Temperature Resistance: High-temperature thresholds available:
- Cast Aluminium Heaters — suitable for application temperatures ≤400°C (752°F)
- Aluminium Bronze Heaters — suitable for application temperatures ≤600°C (1112°F)
Custom Dimensional Freedom:
- Minimum Profile Thickness: Starting from 16 mm (subject to dimensional configurations).
- Round Heaters: Available from 20 mm to 800 mm inside diameter (ID), with custom widths 20 mm to 800 mm.
- Flat / Platen Heaters: Available from a minimum size of 60 mm long × 20 mm wide, with custom dimensions to suit the application.
Optimised Power Densities:
- Cast Aluminium: ≤40 W/in² (6.2 W/cm²) at 400°C
- Cast Aluminium Bronze: ≤50 W/in² (7.75 W/cm²) at 550°C.

Custom Terminations, Patterns & Dies

Every heater is terminated to match your exact environmental and machine requirements. Options include IP65 dust and moisture-proof housings, standard 2 or 3-pin plugs, terminal boxes, block terminals, screw terminals, or flexible metal braided or conduit armoured leads.

Reduced Tooling Costs: Soloheat holds a vast archive of existing patterns and dies. Our in-house pattern-making shop (both woodworking and 3D printing) and fabrication shop (dies) can rapidly modify existing tooling or work directly from your physical machinery samples to dramatically minimise new pattern costs.

Specialised Variations: Air & Water Cooled Units

Air-Cooled Cast Aluminium & Aluminium Bronze Finned Heaters

Designed primarily for extruder barrels requiring highly accurate temperature control. These feature custom-cast internal or external fins engineered to work alongside centrifugal fans. Soloheat can manufacture the complete assembly, including custom cowls, shrouds, and ducting to integrate seamlessly with your machinery.

Water-Cooled Cast Alloy Heater Coolers

For applications requiring liquid cooling or precise thermal control, stainless steel or Incoloy cooling tubes can be cast directly into the heater alongside the electrical heating elements.

This integral construction provides efficient heat transfer and rapid heat dissipation, helping control process temperatures and reduce thermal stress during repeated heating and cooling cycles.

Cooling tubes are available in a range of outside diameters, including:

Imperial: ⅜″, ½″ and 1″ OD
Metric: 8 mm, 10 mm, 12.5 mm, 15 mm and 20 mm OD

Other sizes are available on request.

Tube material, diameter, configuration and connection arrangement can be selected to suit the application.

Why are cast aluminium heaters so efficient?

Aluminium conducts heat approximately three times more effectively than steel, allowing the heat generated by the internal tubular heating elements to spread evenly throughout the casting before being transferred into the machine component. The result is improved temperature uniformity, reduced hot spots and excellent process stability.

Choosing Between Cast Aluminium and Aluminium Bronze

The choice between cast aluminium and cast aluminium bronze depends upon the operating temperature, power density and environmental conditions of the application. Cast aluminium offers excellent thermal conductivity, rapid heat transfer and outstanding value for most industrial processes operating below approximately 400°C. For higher temperature applications or environments requiring increased mechanical strength and resistance to contamination, cast aluminium bronze provides higher permissible watt densities and operating temperatures whilst maintaining excellent thermal uniformity. Our engineers can recommend the most suitable casting material based on your application requirements.

How Cast Aluminium Heaters Work

Cast Aluminium heaters are manufactured by casting a high-quality aluminium alloy around a precision-engineered electric heating element. Similar to Mica or Ceramic band heaters, they transfer heat through clamping pressure by directly fitting them by use of bolts or strap bands. Due to their robust construction and machining capabilities, cast aluminium heaters can also become an integral part of the heated component, providing excellent thermal conductivity and uniform heat distribution. The aluminium casting acts as both the heater body and an efficient heat spreader, reducing hot spots while maintaining consistent operating temperatures.

Optional Cooling Capability

Many cast aluminium heaters can be supplied with integrated cooling tubes, or cast in cooling fins around the outside of the main body.

When cooling water or air is introduced, the heater can rapidly remove heat from the process without removing the heater itself.

This makes them ideal where both heating and controlled cooling are required.

Typical applications include:

Plastic injection moulding
Blow moulding
Extrusion equipment
Packaging machinery

Why Cast Aluminium Heaters Are So Efficient

Unlike thinner sheet-metal heaters, cast aluminium heaters have significant thermal mass.

This provides several advantages:

Excellent heat retention
Even heat distribution
Reduced temperature fluctuations
Faster recovery after production interruptions
Improved energy efficiency

Although they take slightly longer to reach temperature initially, they maintain stable temperatures exceptionally well.

Built-In Heating Element Protection

The heating element is completely encapsulated within the aluminium casting.

This protects it from:

Moisture
Mechanical damage
Contamination
Chemical attack
Vibration

The result is a highly reliable heater with an exceptionally long service life.

Request a Quote & Specification

Global Lead Times: 2–3 weeks for standard cast items | 4–6 weeks* for complex, bespoke units.

Need a direct replacement, a custom build, or a tailored element fitted to your custom tooling? Contact our technical design team today at sales@soloheat.co.uk or call us +44 (0)1453 752459 to discuss your project requirements.

*subject to quotation

Click here to download our Cast Heater survey sheet template or here to contact us.

Why Choose Soloheat Cast Aluminium Heaters?

At Soloheat, every cast heater is designed and manufactured to your requirements by time served engineers – from foundry personnel, sheet metal workers, machine shop engineers, CAD / 3D software engineers alongside bespoke trained fitters and finishers.

We can supply:

Fully custom dimensions (subject to our maximum capacity)
Integral thermocouples
Cooling tubes
Air cooled finned
Multiple voltage and wattage options
Precision machined surfaces
Replacement heaters from samples or drawings
Fast UK manufacture and technical support

Our heaters are designed to maximise heat transfer, improve process efficiency and provide years of reliable operation in demanding industrial environments. Some heaters returned to us by customers for repair were originally manufactured and supplied by Soloheat in the 1980s, a testament to the long service life achievable with cast heaters.

Cast Heater FAQs

FAQ Quick fire facts:

Potential power density greater than other types of band heater.
Highest application temperatures available
- Cast Aluminium Heaters – suitable for application temperatures ≤400°C (752°F)
- Aluminium Bronze Heaters – suitable for application temperatures ≤600°C (1112°F)
Round Heaters: Available from 20 mm to 800 mm inside diameter (ID)
Round Heater Width: 20 mm to 800 mm
Flat heater minimum length = 60 mm
Flat heater minimum width = 20 mm
Minimum heater thickness = 16 mm (dependent upon other dimensions)

Maximum Power densities:

Cast Aluminium Heaters – Maximum power density ≤40 W/in² (6.2 W/cm²) at 400°C
Aluminium Bronze Heaters – Maximum power density ≤50 W/in² (7.75 W/cm²) at 550°C

How long do cast aluminium heaters last?

With correct installation and temperature control, cast aluminium heaters typically provide many years of reliable service. Their fully encapsulated heating elements protect against moisture, contamination and mechanical damage, helping to maximise operational life.

What aluminium alloy is used?

Most heaters are manufactured using LM24 aluminium casting alloys selected for:

Excellent thermal conductivity
Good machining properties
Mechanical strength
Corrosion resistance
Long operating life

Can cast aluminium heaters be machined after casting?

Yes – after casting, heaters are precision machined to achieve:

Accurate bore diameters
Flat mounting surfaces
Tight tolerances
Mounting holes and slots
Counterbores and threaded holes

This ensures maximum contact with the heated component.

Can replacement cast aluminium heaters be manufactured?

Absolutely. If your existing heater has failed, we can often manufacture an exact replacement using either a sketch / drawing or by reverse engineering your existing heater. We have thousands of drawings and designs on file for referencing. Alternatively, download our Survey Sheet to complete and return to us for a quotation.

Can cast aluminium heaters include cooling?

Yes. Many cast aluminium heaters incorporate cast-in cooling tubes for either water or air cooling. This allows the same heater to both heat and cool the process, providing faster cycle times and improved temperature control.

Why choose cast aluminium heaters instead of ceramic or mica heaters?

Cast aluminium heaters offer several advantages over other types of heaters:

More uniform heat distribution
Greater mechanical strength
Better thermal efficiency
Improved temperature stability
Longer operating life
Optional integrated cooling
Precision machined contact surfaces

Soloheat Electric Heating Element Solutions – Quick Links

Not sure this is the heater type for your application? Take a look at our other heating solutions:

For more information on Electric Engineering Principles, check out our Engineering Guide