Cartridge heater units contain a tube-shaped heating element that’s used in HVAC compressors, fuel cells, semiconductors, medical devices, and much more. Similarly, heating cables are heating units that are used for frost protection, ice and snow melting, and other larger-scale heating applications. Another type of unit, an immersion heater, is used to heat hot water. These small immersible plug-in coil heaters can heat water in a matter of minutes. Process heater elements work like immersion heaters, but are typically packed in a silicone rubber sheath, rather than a coil design, and are used for larger industrial heater applications. We also carry electric unit heaters and portable electric heaters too.