The most recent form of collector is the evacuated
tube or vacuum tube system. It works by exploiting
a vacuum around the collector which reduces heat
loss from the system, making it especially suitable for
more temperate climes.
These units heat water from 60 to 80 C which is
sufficient for providing domestic hot water.
They can continue to operate under cloudy conditions and should be linked to an insulated storage facility for continuity of supply. However, the installation cost is significantly higher than for flat bed collectors.
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