... seam,avoid cracking and has a long life for about 8 years. 2. vacuum system to prevent oil gas be back ... :use Q345R special steel plate ,welding seam the life will 8 yearsenergy saving:1. well sealing for heating system ,no gas ... boiler plateThickness of reactor14mm,16mm,18mm,20mmRotate speed of reactor0.8 turn/minuteMode of coolingWater coolingWorking modeContinuous feedingDelivery time20 days after ...