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Description:pressurized solar collector high heat efficiency, used in 4 season easy installation protect freezing and hail nice design suitable for project installation non-pressurized erect-plug solar collector freezing-resist, suitable for temperature from 0 to -20 degree non-pressurized, keep it with water to ensure the tubes can't be damaged. It's with many models for optional. In sunny day, it can produce 55 degree water in 70-130kg/m2 low emittance daily average heat efficiency