Detailed Description  Introduction Skylight compact pressurized solar water heater takes advantage of the vacuum tubes which has the property of high absorptivity and low emissivity, and transfer swiftly the heat absorbed to the water by heat pipe inside the vacuum tubes. This kind of solar water heater can operate efficiently from summer to winter, and afraid not the frost cleft of the vacuum tubes.  Features 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 0.6Mpa,0.4Mpa 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, 11. No water in the vacuum tubes eradicate the frost cleft even in Jack Frost condition 12. The whole system will still run even a single tube breaks, 13. Full automatic function  14. Can realize pipeline evacuation Inner tank Material S.S. SUS304-2B food grade Thickness mm 1.2-1.5 Out shell I Material S.S SUS304-2B food grade Thickness mm 0.5 Out shell II Material Al-Zn-alloy-coated coil sheet Thickness mm 0.5 Insulation mm 50 Frame I Material SUS 201 stainless steel Thickness mm 1.2 Frame II Material Galvanized steel Thickness mm 1.5 Evacuated Tube Specification Diameter × Length mm Ø58 x 1800 Vacuum degree Pa 3.3 x 10-3 Absorptivity 0.93 Emissivity Heat transfer power KW/ M2 26000 Anti-freeze -10 Anti hail mm DiameterFrame/ Connector Anti-wind  m/s 26.5 Inlet outlet dimension G G1/2