The FXS range of self-regulating enclosure heaters provide a bespoke solution tailored to suit your requirements. Unlike fixed duty heaters, FXS heaters do not require a thermostat to operate safely, due to their inbuilt ability to reduce the output as the temperature increases. They can operate in ambient temperatures as high as 130°C (T4) or 180°C (T3) and down to -60°C, and are certified for use in hazardous areas where the atmosphere is classified as Zone 1 or 2 (Gas groups IIA, IIB, IIC) and Zone 21 or 22 (Dust groups IIIA, IIIB, IIIC).

The FXS enclosure heaters can also be easily integrated with the FXT range of thermostats for enhanced temperature management.


  • Hard anodised aluminium housing suitable for onshore and offshore applications
  • Can be directly mounted to the component that requires heating
  • Compact and efficient
  • Suitable for ambient temperatures as low as -60°C and up to +180°C
  • Available in T3 and T4 temperature classes


Certification ATEX II 2 G D
Ex db IIC T4 to T3 Gb
Ex tb IIIC T135°C to T200°C Db

Ex db IIC T4 to T3 Gb
Ex tb IIIC T135°C to T200°C Db
Voltage 100 to 140VAC or 200 to 265VAC
Output Up to 1000W (subject to design, mounting and ambient conditions)
Ambient -60 to +130°C: T4 heaters
-60 to +180°C: T3 heaters
T Class T4 (135°C) or T3 (200°C)
Mounting Directly bolted
Cabling 3m standard (up to 10m available on request)
IP Rating IP66 / IP68