The most obvious reason to purchase a oil filled radiator heater is for safety and a silent operation. These heaters operate by warming up a special heat-conserving
oil inside the heater. Then it circulates the oil throughout the coils and fins of the radiator to heat them. Those coils and fins radiate the heat into the
rest of the room through convection. Cold air is warmed by the heat radiating from the fins of the heater and the warmed air rises drawing in the air below it
which is usually colder than the air above and the process repeats. Since it does not have fans to move the air around the radiator is silent.