Cast Aluminium Heater Manufacturer UK | Custom Cast Heaters
How Soloheat manufactures cast alloy heaters
Soloheat specializes in the custom design and manufacture of high-performance Cast Aluminium and Cast Aluminium Bronze heaters. Operating from our facility in Gloucestershire, we are proud to be the only foundry in England dedicated exclusively to manufacturing Cast Alloy Industrial Heating Elements for a global market.
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 up to ≤600°C (1112°F), with recommended application starting from ≤300°C (572°F).
- Custom Dimensional Freedom:
- Round Heaters: Minimum ID of 10mm up to a maximum ID of 800mm. Custom widths from 20mm to 800mm.
- Flat / Platen Heaters: Minimum length of 60mm and minimum width of 20mm.
- Minimum Profile Thickness: Starting from 16mm (subject to dimensional configurations).
- Optimized Power Densities:
- Cast Aluminium: ≤40 watts/inch² (6.2 W/cm2) at 400°C.
- Cast Aluminium Bronze: ≤50 watts/inch² (7.75
- W/cm2) at 550°C.
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 Globaly recognised Firms.
Whether fitted to an OEM’s machine barrel, integrated into precision dies & molds 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: Specialized 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.
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 minimize new pattern costs.
Specialized 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 processes requiring liquid cooling to maintain strict thermal limits. We cast heavy-duty stainless steel or Incoloy cooling tubes (available in 3/8”, 1/2”, and 1” outer diameters) directly alongside the electric heating element. This ensures rapid heat dissipation and prevents internal thermal stress during rapid heating and cooling cycles.
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 the robustness and machining cababilities, Cast Aluminium heaters may also become an integral part of a 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 of the heaters returned to us by customers for repair had originally been manufactured & supplied by us in the 1980’s, a testiment to the reliability of cast type heaters.
Cast Heater FAQ's
FAQ Quick fire facts:
- Potential power density greater than other types of band heater.
- Highest application temperatures available > 600oC / 1112oF
- Recommended application temperatures > 300oC / 572oF
- Round heater Minimum / Maximum diameter = 20mm id / 800mm id
- Round heater Minimum / Maximum width: 20mm / 800mm
- Flat heater minimum length = 60mm
- Flat heater minimum width = 20mm
- Minimum heater thickness = 16mm (dependant upon other dimensions)
Maximum Power densities:
- Aluminium heaters <40 watts / inch² (6.2w/cm²) – 400 Degrees Celsius
- Aluminium bronze heaters <50w/inch² (7.75w/cm²) – 550 Degrees Celsius
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
© 2026 Soloheat Ltd. All rights reserved.