Task is heat treatment and controlling of the materials. Usually they have electrical heating and tiristor controlling. The cycles - heating-up, keeping-warm, cooling-down – can be adjusted to the split of a second. The temperatures can differ from the adjusted values minimally. The structure of the plant (panel elements) has at least 3 layers and mineral wool isolation with 120 kg/m3 consistence. The structure is made with panel connection protection, so we can minimise heat loss.