... tubes,with the following advantages:1,Radiating areainscresed by 2.5-4 times,the tube surface load increased by 1.5-2times.With the ... ,In a limitation of heatingdevice,the power is reached at 1.5-2 times of the electric heating tube,reducing the ... . We will cooperate with the customs at home and abroad by using our sincere and excellent service! For the special specifications ...