Heating element for oil
Liquid heaters do not include any built-in temperature control or measurement.
In the center of the heaters is a thermostat pocket, which can be fitted with a thermostat and/or overheat protection.
A thermostat or overheat protection placed in the pocket does not protect the resistor from overheating caused by dry running.
Never use the heater if you are not sure it is suitable for the substance in question.