How to make a solar water heater at home - [A Study]

This is a homemade solar water heater. Do you know, in one hour Earth receives more energy from Sun than the world use in one year? Very very less amount of solar energy is converted to renewable energy. One of the best use of solar energy is water heating. In some country / city it is mandatory to use a solar water heater. Here we will do a simple study to understand and make a simple solar water heater.
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