Backer always stocks a wide range of thermostats and thermal cut-offs from different brands for use with standard immersion heaters. Thermostats are used when a media (e.g. water or air) should be heated to a predefined temperature. They control/regulate the power supply for an immersion heater or a-duct heater, for exampe. Thermal cut-offs are used as safety devices to avoid overheating and they are normally reset manually.