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The non-pressurized system is based on the natural circulation - thermosiphon phenomenon. it's the most cost-effectiveness and environmentally friendly way to harness solar energy for hot water appications,which is unsurpassed by any other solar thermal products, for its most high efficiency , low cost , and easy installation. Feature 1)the most reliable, cost saving , efficient hot water heating solution. 2)Anticorrosion inner tank, low maintenance cost, 3)Simple struture, easy installation, labour cost saving. 4)Completely automatic operation with intelligent controller. the vaccum tube freasure: 1 Borosilicate glass 3.3, diameter is 47/58. leng:1500/1800. 2the quantity is 10/12/15/18/20/24/30/36. 3 water capacity is 100L/115L/130L/155L/195L/235L/ /300L/360L. 4Absorber area is 1.34/1.6/1.78/2.15/2.69/3.23/1.88/2.25/2.5/2.5/3.01/3.75/4.55in the tube water keep clean and drinkable. The vaccum tube quantity can be adjust according
