Screw-in immersion heaters
Screw-in immersion heaters from KMT Heiztechnik heat water, oil and other media directly in the tank: heating rods in a G 1½" or G 2" threaded nipple, power outputs from 1,500 to 12,000 W and integrated control on request — supplied from quantity one.
Direct media heating
Heat directly in the tank.
From buffer tanks to dip baths to fryers: the screw-in immersion heater is screwed into the tank socket and delivers its power directly to the medium — without detours. We supply every version to match your socket and your medium, from quantity one.
Heating rods with an ø of 8.5 mm are soldered into the threaded nipple made of brass or stainless steel; the unheated zone safely passes through the tank wall. The connection cap — plastic, stainless steel or aluminum — protects the connection space and, on request, houses a thermostat or controller/limiter combination.
Up to 12,000 W from one socket
Several heating rods in the threaded nipple deliver up to 12 kW directly into the medium — screw in, connect, heat.
Control can be integrated
On request with internal setpoint adjustment, thermostat, or controller/limiter combination — the control sits directly in the connection cap.
Material to match the medium
Sheath materials from 1.4541 to 2.4858, threaded nipple in brass or stainless steel — matched to water, oil, emulsions and chemical media.
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 screw-in immersion heater is designed individually for you based on these technical standards.
| Construction | Tubular heater ø 8.5 mm, soldered into the threaded nipple |
| Thread | G 1½" or G 2" (AF 65) |
| Nipple material | Brass or stainless steel (1.4571 / 1.4404) |
| Sheath materials | 1.4571, 1.4541, 1.4876, 1.4828, 2.4858 |
| Immersion length | 200 – 800 mm |
| Length tolerance | ±1% (minimum 10 mm) |
| Unheated zone | Standard 30 mm |
| Sheath temperature | up to 850 °C |
| Power | 1,500 – 12,000 W |
| Voltage | 230 / 400 V or 3×400 V |
| 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 screw-in immersion heater delivers its power directly to the medium. If the fill level drops below the heating zone, heat dissipation is lost and the heating rod overheats — the heating zone must therefore always be fully immersed.
- Design the immersion length and unheated zone to match the tank — the unheated zone passes through the socket.
- Seal the thread properly and check for leaks after the first heat-up.
The connection cap protects the connection space — keep it closed and keep moisture away. Over time, an insulating layer forms on the heating rods 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)
- 03Choose immersion length & unheated zone to match the tank
- 04Seal the thread properly — check for leaks
- 05Keep connection cap closed — keep moisture away
- 06Remove deposits (e.g. limescale) regularly
Range of designs
Designs & options
Without control
The basic screw-in immersion heater for operation with external control — temperature control via your system controller.
With thermostat / internal setpoint
Integrated thermostat in the connection cap — the setpoint temperature is set directly on the heater.
With controller & limiter
Controller and limiter combination for added safety — the limiter shuts down permanently in case of overtemperature.
Special versions
Different immersion lengths, power ratings, cap and nipple variants — to specification, drawing or sample part.
Options & accessories
Cap, nipple, voltage and control depend on the tank, medium and installation situation.
Expertise
Application areas
Hot water and buffer storage tanks
Solar and heat pump systems
Immersion baths
Deep fryers
Drying ovens
Industrial plants and mechanical engineering
Chemical and process engineering
Oil and emulsion heating
Technical documentation
* Documentation available on request already now — please use our form.
FAQ
Frequently asked questions
No. We supply screw-in immersion heaters from a quantity of one — typically, for example, as a replacement for a defective heating element in a buffer or hot water storage tank. Every version is manufactured to order according to your specifications.
Without control, your system's control unit takes over temperature management. With an integrated thermostat or internal adjustment, the target temperature is set directly on the heater. The controller-and-limiter combination adds a safety limiter that shuts down permanently in the event of overtemperature. Tell us the installation situation — we will recommend the right variant.
G 1½" and G 2" with an across-flats size of 65, nipples optionally in brass or stainless steel (1.4571 / 1.4404). The decisive factor is the existing socket on your vessel — if in doubt, a photo with a dimension is sufficient.
The heater dissipates its power into the medium. If the fill level drops below the heating zone, heat dissipation is lost — the heating element overheats and is destroyed. The heating zone must be fully immersed at all times; a dry-run protection device is recommended.
For drinking water and standard applications, proven stainless steels such as 1.4571 are sufficient; for oils, emulsions and chemically demanding media, higher-alloyed materials up to 2.4858 are available. Tell us the medium and the operating temperature — we will select the right material.
Limescale deposits on the heating elements and acts as an insulating layer — heat is dissipated less effectively and service life decreases. The remedy: a moderately sized surface loading and regular descaling. For heavily lime-laden water, we will advise you on the appropriate sizing.
Yes. Send us the old part or the key data (thread size, immersion length, voltage, power, control type) — we determine the matching design and supply an equivalent replacement, regardless of the original manufacturer.
You provide us with the thread size, immersion length, electrical data and the medium, 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:
- 01Thread size of the screw-in fitting (or dimension of the existing socket on the vessel)
- 02Installation length / immersion depth in the vessel
- 03Medium to be heated (water, oil, chemical media) and vessel size
- 04Voltage and power
- 05Control: integrated temperature controller or controller and limiter required?
- 06Terminal cap: plastic, stainless steel or aluminum
- 07Operating temperature and ambient conditions (humidity, hazardous area, outdoor installation)
- 08Quantity — and, if available: drawing or old part
Request a Product
Free and non-binding — sent directly to our technical sales team.