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Solar vacuum tube with straight copper heat pipe, there is anti-freeze liquid insideas medium transfering of heat. By the design the water never Come into vacuum tube immediately so the tube will never be broken in low temperaturein winter. We use this type for separate pressurized system or integrativepressurized system. High quality of tri-elements as rose copper, stainless steel and aluminium nitrideplanting layers, heat absorption rate can reach more than 93%, certify enoughpower for hot water request.