Solar water heater system with recyclable materials:

http://www.solar-energy-for-homes.com

Solar water heater is a system that use sun heat as renewable energy source. As it can be seen in the picture, cold water is pumped to the sun collector. when it gets warm, because of the feature of water with out pumping it goes to the tank above solar collector( Chong,K 2012). Then it can be used for different purposes in the building. In order to make this system more environmental friendly and more efficient from economic point of view this system can be made by empty and used bottles or soda cans. The bottles are filled with water and are used as solar collector. This is a home made structure that can decrease the cost of electricity and help to environment by using recyclable materials and renewable energy.

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Source:
http://www.sciencedirect.com/science/article/pii/S0960148111004459
https://www.youtube.com/watch?v=ehDgXrpRlTU