closed loop solar hot water with heat pipes

china pressurized solar water heater,better efficiency and competitive price,achieved CE and ISO certificated,pressurized solar water heater Features and advantage 1,Heat Pipe:faster speed for heat transfer,more than copper 1000 times. 2,Freeze Protection: Because the heat pipe is located within the evacuated glass tube, brief overnight temperatures as low as -20oC (14oF) will not cause the heat pipe to freeze. 3,Working pressure:6.0 bar for working,9.0 bar for testing,suited for existing government cold water supplier 4,Safety:no water in tube,if tube broken,no water lose. 5,High efficiency and temperature:highest temperature arrive 350 degree. 6,Provide enough heat energy to storage tank,each square meter can save 5khw energy every day! Guarantee and service 1,FIVE years guarantee,replace free 2,All manual of installation and operation are free 3,Both for inclinde or flat roof,install angle from 30-45 degree. 4,CE and ISO9001 certificated 5,100% tested before delivery Products list TypesLightingareasSpecsofvacuumtubesNo.ofVacuumtubeCapacityoftankQty20'/40'GP(m2)(mm)(L)SetsSS-IP-188/151.0558×18001512547/93SS-IP-188/162.258×18001613041/85SS-IP-188/182.4558×18001815039/81SS-IP-188/202.758×18002016535/74SS-IP-188/243.358×18002420029/62SS-IP-188/304.158×18003025024/51SS-IP-188/365.0458×18003630020/42