Compact cross-section
High heat output can be positioned close to nozzles, manifolds, sealing bars and restricted machine spaces.
Hotset hotspring technology
COIL
HEATERS
Compact, responsive heating elements manufactured by Hotset Germany and held in stock by Hotset UK for rapid supply and technical support.
Compact precision heating
HEAT WHERE SPACE IS LIMITED
Coil heaters place a compact, mineral-insulated heating element close to the surface or component requiring heat.
Hotset introduced its first round hotspring coil heater in 1980 and has developed the range to include different profiles, sizes and application-led constructions. Hotset UK holds coil heaters in stock and can also work with Hotset Germany on specialised requirements.
They are particularly well suited to hot-runner nozzles, manifolds, sealing equipment and other applications needing concentrated heat from a small cross-section.
Stock or bespoke?
Give us the Hotset reference where known. If no direct replacement is available, send the heater dimensions, electrical rating, coil form, leads and application so that alternatives can be assessed.
Our principal stocked range
HOTSPRING
CLASSIC / F
The 2.2 × 4.2 mm flat hotspring is our main coil-heater range for nozzle and compact process-heating applications.
We hold straight lengths in the UK ready to wind to the required diameter and pitch. Other hotspring sizes, powers and connection options are available from Hotset Germany, normally within 7–10 working days.
Standard UK-stock construction
230 V, 65 mm unheated section, 25 mm transition head, 1 metre PTFE leads and an ungrounded Type J thermocouple.
- Cross-section
- 2.2 × 4.2 mm
- Maximum sheath temperature
- 750°C
- With clamping band / reflection tube
- 650°C maximum
- Maximum surface load
- 7.5 W/cm²
- Maximum connection-head temperature
- 260°C
- Minimum winding diameter
- 8 mm
Coil selection tool
CALCULATE THE
WINDING RANGE
Enter the nozzle diameter and heated length. We will show every UK-stock coil that can be wound within the standard range.
Your suitable stock coils will appear here.
The result checks winding geometry only. Hotset UK will confirm the wattage and thermal suitability for your application.
How the winding calculation works
The calculation uses the heater centreline: circumference = (nozzle diameter + 2.2 mm) × π. Turns = heated length ÷ circumference. Closed-coil length = (turns × 4.8 mm) + 4.2 mm. Standard winding may extend to 2½ times the closed-coil length.
Straight lengths held in the UK
CLASSIC / F
STOCK RANGE
All stock items are 2.2 × 4.2 mm, 230 V, with 65 mm cold length, a 25 mm head, 1 metre PTFE leads and Type J thermocouple.
Stock codeHeated lengthPowerSupply
Need another construction?
THE FULL HOTSPRING RANGE IS AVAILABLE.
We can source alternative profiles, heated lengths, wattages, voltages, sensors and terminations from Hotset Germany—normally within 7–10 working days.
Discuss a special →Product possibilities
BUILT FOR PRECISE HEAT
The correct coil heater combines the required profile and formed shape with suitable wattage, terminations and temperature sensing.
Different profiles
Round, flat and square-profile variants are available within the Hotset hotspring range.
Formed configurations
Elements may be supplied straight or formed to suit the diameter and geometry of the application.
Temperature sensing
Suitable constructions can incorporate or work alongside a thermocouple for controlled temperature measurement.
Mechanical protection
Reflection tubes, sleeves and clamping arrangements can protect the heater and support heat transfer in suitable applications.
UK stock support
Hotset UK stocks commonly required coil heaters and has access to the wider knowledge and range of Hotset Germany.
Typical applications
WHERE COIL HEATERS ARE USED
Coil heaters are selected where concentrated, accurately positioned heat is required within a compact installation.
Hot-runner nozzles
Close-fitting heating around injection-moulding nozzles and flow paths.
Hot-runner manifolds
Formed elements positioned within machined grooves to heat manifold systems.
Sealing bars
Compact heating for packaging bars, jaws and sealing equipment.
Special-purpose tooling
Dies, laboratory equipment and machinery requiring a small, formable heating element.
Preparing an enquiry
WHAT DO WE
NEED TO KNOW?
These details help us identify a stock product or assess a suitable coil-heater construction.
Need a coil heater?
Request a quotation →
SEND US THE REFERENCE OR SPECIFICATION.
We can check UK stock or work with Hotset Germany to assess the required construction.