Why is pump monitoring reasonable in a thermal oil system?

Pumps are the determining components in heat transfer systems with liquid heat transfer mediums.
As „heart“ of the system, they ensure that the heat transfer medium circulates in the system and the thermal energy provided by the heater is conveyed to the right position in the system.

These pumps can be equipped with relatively simple monitoring sensors that bear no relation to the purchasing costs of a new pump. Even a damage on a component of a pump, e.g. a damaged bearing, can be repaired if detected early; otherwise at a later stage, most pumps must completely be replaced. The economic loss because of an unwanted standstill due to damage to the pump or even a fire caused by a leaking pump, more than ever exceeds the costs for a reliable pump monitoring.