The invention relates to a molten material processing device having an elongated thermal element like a heating element, a thermocouple, a sensor, a heatpipe and a cooling pipe which is characterized in that the elongated thermal element is located in a recess provided in a surface of the molten material processing device, the recess, including a first portion and a second portion, has a cross-section which is larger than a cross-section of the thermal element, so as to provide a clear space between the thermal element and the surface of the processing device, the clear space which is limited by the first portion and the thermal element is filled by a thermally sprayed material and the second portion, which is adapted to the cross-section of the thermal element, partially surrounds and directly contacts same.