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Classify by heating method:
1.Indirect heating System
...The thermo-siphon system is a modified heating system. It can be used in any type of water quality. The cold water is heated through the collector and go to the storage tank to heat up the cold water in the tank.

The thermo-siphon system is comprised of
¡´Collector
¡´ Storage tank
¡´ Connecting Kit
¡´Galvanized steel stand

 
 
2.Direct heating System
...In forced circulation systems, a pump and control unit are utilized to ensure correct water circulation. The cold water will flow into the collector to warm up and flow back to the storage tank. It is suitable for using in soft water areas to prevent the blockage of water pipes.
 
Classify by circulation
1.Nature circulation system
...It is normally used in small system. The storage tank is installed on top of collector. The system uses natural water circulation (The heat makes expansion and the cold causes contraction.) to warm up the cold water so that there is no pump or control unit required. It is also the most cost and energy efficient solar system with low maintenance. Because of its high efficiency, it can provide hot water in only a few hours of sunlight.
   
2.Forced circulation system
...It is normally used in large system and special areas where is not suitable to install the storage tank. Hence the storage tank is installed indoor or ground which is lower than the collector. It uses the water pump to force the water to circulate. It will be cheaper since you can don't have to buy the storage tanks for all collectors.