Regulated/unregulated screw-in heaters, insulated

Insulated screw-in heaters are used primarily inside enamelled buffer tanks – for example in hot water boilers. As immersion heaters, they are used for direct heating of liquid media. Clients include boiler manufacturers, installers and companies from the solar industry. Galvanic isolation reduces electrochemical stress corrosion, which would otherwise lead to the destruction of the heating elements.

Pipe material: 1.4404, 1.4876 or 2.4858, Screw fitting material: Plastic or brass, Screw fitting material: Plastic or brass
Connection thread G 1½”
No stress corrosion
For installation in enamelled tanks
With or without thermostat


Screw-in heaters consist of the electrical heating element and a screw fitting. Optionally a cap (IP54) can also be fitted to enable the installation of a thermostat. Electrochemical corrosion is minimised by using a plastic screw fitting or – if a metal screw fitting is used – through galvanic isolation. Voltage, power output, installation length and all the other relevant parameters are specified by our development team to meet the particular requirements of the customer. 

Installation information / temperature control

Our screw-in heaters can be installed horizontally. In the process, it is important to note that the screw-in heater must always be completely covered with medium. If required, we can also supply the heating element together with an installed thermostat with different measurement ranges. The variants listed below are ready to ship from the warehouse, but special measurement ranges can also be supplied on request. 

  • Control range from 30 – 85 °C / temperature limited to 110 °C
  • Control range from 30 – 95 °C / temperature limited to 120 °C
  • Control range from 25 – 70 °C / temperature limited to 98 °C