| http://www.w3.org/ns/prov#value | - Such systems are often classified as DIRECT where water is pumped directly through the collector and back into the storage tank, and INDIRECT where an anti-freeze fluid is pumped through the collector, and heats water in storage by means of a heat exchange coil.Active Systems and Collectors: Active Systems and Collectors There are many types of collectors but they mostly have the same features.
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