A device for heating molten long-chained hydrocarbons comprises a first heating section having at least one first material flow tube extending from a first heating section inlet to a first heating section outlet, the first material flow tube providing a flow path for the molten long-chained hydrocarbons from the first heating section inlet to the first heating section outlet, and a first heating structure extending along at least a portion of the first material flow tube, the first heating structure being configured to transfer heat to the first material flow tube; and a second heating section having at least one second material flow tube and at least one third material flow tube, the at least one second material flow tube extending from a second heating section inlet to a second heating section outlet, the at least one third material flow tube extending from a third heating section inlet to a third heating section outlet, the second and third material flow tubes providing flow paths for the molten long-chained hydrocarbons from the second and third heating section inlets to the second and third heating section outlets, respectively, wherein the second and third heating section inlets being configured to receive the molten long-chained hydrocarbons from the first heating section outlet, and to split the flow path for the molten long-chained hydrocarbons towards the at least one second material flow tube and the at least one third material flow tube; and wherein the second heating section inlet and the third heating section inlet are arranged on different heights.