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Thermosiphon
 
Thermosiphon Principle
   
A thermosiphon system relies on warm water rising, a phenomenon known as natural convection, to circulate water through the collectors and to the tanks. In this type of installation, the tank must be above the collector. As water in the collector heats up by solar energy, it becomes lighter and rises naturally into the tank above. Meanwhile, cooler water in the tank flows down pipes to the bottom of the collector, causing circulation throughout the system. The storage tank is attached to the top of the collector so that thermosiphoning can occur. These systems are reliable and relatively inexpensive.

The greater the difference in temperature between the water in the collector and the water in the storage tank, the faster the flow between them. Hence, the system works more efficient.