This product is solar vacuum tube with copper heat pipe.Solar vacuum tube with straight copper heat pipe, there is anti-freeze liquid inside as medium transfering of heat. By the design the water neverCome into vacuum tube immediately so the tube will never be broken in low temperature in winter. We use this type for separate pressurized system or integrative pressurized system.High quality of tri-elements as rose copper, stainless steel and aluminium nitride planting layers, heat absorption rate can reach more than 93%, certify enough power for hot water request.keywords:solar water heater glass tube, all glass evacuated solar collector tube, solar collector heat pipe vacuum tube

glass vacuum tube with copper heater pipe