The KVOh model is ideal for heat treatment of cables and pipes before and after coating. The furnace is equipped with a horizontal batch guide. The heating device is constructed with heating tubes, and arranged in such a way that uniform heating takes place around the entire circumference of the cable. In case of failure, the heating tunnel is lifted pneumatically. This prevents damage to the batch during standstill. All functions can be integrated into an existing line control system. The furnace is designed with one heating zone each in the inlet and outlet areas. Control is by means of an easy-to-operate temperature controller.