1. Uni-directional heat transmission 2. Can start from lower temperature 3. Faster transmission 4. Lower heat capacity 5. Low temperature resistance 6. Freeze-proofing 7. High frequency soldering inner tank 8. Rating pressure is 0.6Mpaú¼0.4Mpa separately, can connect directly with the city water system 9. No water in the vacuum tubes eradicates the incrustation scale, thus keeping them running in high efficiency, 10. No water in the vacuum tubes eradicates the leakage due to the aging of silica gel gasket or broken of the tubes, Export cartons
