You must use caution in returning the system to its heating position in the spring. Some water will have remained in the tank over the winter and so you must tip the system upright before sunup or after sunset to avoid cold water entering the hot tubes and fracturing them because of the shock of cold tank water entering the hot tubes.
You must also insure that your system is filled with water during sundown to avoid fracturing the tubes. They will always feel cool to the touch but can reach temperatures of 300 degrees inside and thus cold water entering hot tubes will cause the glass to fracture from the temperature shock.
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