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while the need for freeze protection has traditionally been a complicating factor, systems using evacuated tube collectors may be used in climates with moderate frosts without any need for drainback or antifreeze. This is because an evacuated tube system only has water in the thermally insulated header, not in the evacuated tubes themselves. Additional protection is also provided by the controller: if header temperature drops below a set value (typically 2 to 4'C) the circulating pump is automatically turned on for a short period to pass warmer

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