solar water heater 1)the original equipment; 2)non-pressurized; 3)ISO9001,3C,CE,CNAL; 4) easy ... tube.solar hot water energy Our company produces have used the high strength, good heat resistance high silicon very hard glass production of ... heat preservation effect, the heat exchanger choose SUS304 stainless steel production, anti-corrosion, not deformation, thermal insulation layer advanced overall ...