Immersion heater ATEX II 2 G/D EEx d IIC T1 – T6 The Exheat „RFA-C” range of flameproof removable core heaters offers a hazardous area heating solution for oil and similar applications where low heat density is required. The element can be withdrawn for inspection without system drain down. The standard heater consists of a single element core fitted into a mounting flange. A robust EEx d terminal enclosure protects the electrical connections. The watts density of the element core fitted depends upon the media to be heated and the kilowatt rating required.