Tubular heaters
Tubular heaters from KMT Heiztechnik are highly compacted heating rods for heating liquids, gases and solid bodies. Bendable in the cold state — straight or contour-bent, with sheath temperatures up to 850 °C and lengths up to 4,500 mm, supplied from quantity one.
Versatile heat
The universal element of electric heat.
From dip baths to air heaters to the manifold bar in a hot runner: tubular heaters bring electrical heat into liquids, gases and solid bodies. We supply every heating rod custom-made — straight or ready-bent, from quantity one.
Inside the highly compacted heating rod lies the heating coil, electrically insulated and enclosed by a bendable annealed stainless steel sheath — this is what makes the rod formable in the cold state. The unheated connection zone (standard 35 mm) stays cooler and safely passes through the tank wall or mounting.
Shaped to fit
Bendable in the cold state: straight or contour-bent to drawing — countless bend variants for your mounting situation.
Up to 850 °C sheath temperature
Bendable annealed stainless steel sheath, up to 10 W/cm² and 440 V — even for demanding thermal processes.
Liquids, gases & solid bodies
Water, oil and chemicals, air and technical gases, or direct tool and roller heating — the medium determines the design.
From quantity one
From a single spare part to series requirements — also as an exact replacement for third-party products.
Specifications
Technical data
Precision heating elements for demanding thermal applications. Every tubular heater is designed individually for you based on these technical standards.
| Sheath material | Stainless steel, bendable annealed |
| Diameter | 6.5 / 8.5 / 11.5 mm |
| Length | 250 – 4,500 mm |
| Length tolerance | ±1% (minimum 10 mm) |
| Unheated zone | Standard 35 mm (not bendable) |
| Sheath temperature | up to 850 °C |
| Watt density | up to 10 W/cm² |
| Voltage | up to 440 V |
| Max. current | 16 A |
| Power tolerance | ±10% |
| Dielectric strength | ≥ 1,500 V AC |
| Insulation resistance | 1 MΩ (500 V DC, cold state) |
Safety notes
Mounting & safety
Proper mounting is a prerequisite for the function, service life and operational safety of your heating system.
!The heating zone needs heat dissipation
The tubular heater delivers its power to the surrounding medium. If heat dissipation is missing, the heating rod overheats — for liquid heating, the heating zone must therefore always be fully immersed.
- Account for the unheated zone in the design — it passes through the tank wall or mounting.
- Specify the bend shape with your inquiry — we supply it ready contour-bent. The unheated connection zone is not bendable.
The connection area must be protected from moisture and media. Over time, an insulating layer forms on the sheath in hard water — regular descaling preserves power and service life.
Mounting check
- 01Heating zone fully in the medium — never run dry
- 02Monitor fill level (e.g. dry-run protection)
- 03Account for the unheated zone in the design
- 04Subsequent bending only after consultation
- 05Protect the connection area from moisture & media
- 06Remove deposits (e.g. limescale) regularly
Range of designs
Designs & configurations
Straight design
The classic straight heating rod — for ducts, tanks and anywhere heat is needed along the entire length.
Contour-bent
Bent into shape to sketch or drawing — in the heated or unheated section, in countless bend variants.
Threaded nipple & heating flange
For screwing or flanging into tanks and pipelines — up to a complete screw-in immersion heater.
Radiant heating with reflector
Directed heat radiation without contact — for air heaters, drying ovens and surface heating.
Connection & accessories
From bolt to flat plug connector — the connection depends on the mounting situation, temperature and environment.
Expertise
Application areas
Immersion baths and vessel heating
Deep fryers and commercial kitchen equipment
Air heaters and drying ovens
Manifold bars in hot runner tools
Roller heating
Gas and air heating (e.g. nitrogen, CO₂)
Chemical and process baths
Tool and mold making, special-purpose machinery
Technical documentation
* Documentation available on request already now — please use our form.
FAQ
Frequently asked questions
No. We supply tubular heaters from a quantity of one — straight or ready contour-bent, from a single spare part to series requirements. Every heating element is manufactured to order according to your specifications.
Yes. Tubular heaters can be bent in the cold state — we supply them ready contour-bent to your sketch or drawing, with bends in the heated or unheated section. Only the unheated terminal zone itself cannot be bent. Alternatively, you can obtain straight heating elements.
Liquids such as water, oil or chemical media, gases such as air, nitrogen or CO₂ — and solid bodies, for example tools, rollers or manifold bars. The medium determines the material choice and the permissible surface loading; please state it in your inquiry.
The heating element dissipates its power into the surrounding medium. If heat dissipation is lost — for example when the fill level drops and the heating zone protrudes from the liquid — the heating conductor overheats and the heater is destroyed. The heating zone must therefore be fully immersed at all times; a dry-run protection device is recommended.
The section at the terminal end without a heating coil — standard 35 mm. It stays significantly cooler and safely passes through the vessel wall, fitting or mounting. We size the position and length of the unheated zones according to your installation situation.
Pin terminals (2.6 / 4.6 mm), M3 / M4 threads, glass-silk or silicone-insulated lead wires, spade terminals 6.3 × 0.8 mm or M4 terminals. Plus threaded nipples or heating flanges for installation in vessels and pipelines.
Yes. Send us the old part or the key data (diameter, uncoiled length, bend shape, voltage, power, connection type) — we determine the matching design and supply an equivalent replacement, regardless of the original manufacturer.
You provide us with dimensions, bend shape, electrical data and the medium to be heated, we check the sizing and clarify any open points directly with you. You then receive a quote; after ordering, the heater is manufactured to order and delivered to you.
Our range
More products
Inquiry checklist
This is what we need for your quote:
- 01Design: straight or contour-bent — for bent shapes, please include a sketch or drawing with radii
- 02Tube diameter and uncoiled length
- 03Unheated zones: position and length
- 04Voltage and power
- 05Connection type: pin terminal, thread, lead wire, plug or terminal
- 06Medium to be heated (air, water, oil, chemical media) — determines material choice and permissible surface loading
- 07Operating temperature and installation situation (e.g. hot runner manifold bar, vessel, duct)
- 08Quantity — and, if available: drawing or old part
Request a Product
Free and non-binding — sent directly to our technical sales team.