A more sophisticated open-loop passive system is a thermosiphon, in which hot water is stored in an insulated solar storage tank mounted above the collector.
Water flows through the system when warm water rises as cooler water sinks. The collector must be installed below the storage tank so that warm water will rise into the tank.
These systems are reliable, but contractors must pay careful attention to the roof design because of the heavy storage tank. They are usually more expensive than integral collector-storage passive systems.
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