Heating element for oil
Liquid heaters do not include any built-in temperature control or measurement.
There is a thermostatic well in the centre of the heaters, which can take a thermostat and/or overheating protection.
A thermostat or overheating protection placed in the well does not protect the resistance from overheating caused by dry running.
Never use the heater if you are unsure whether it is suitable for the substance in question.