How to tap solar energy is no more an issue with the discovery of solar panels. These panels can absorb sun’s radiation and convert it into electrical energy. However, the cost of these panels is one thing that has been a cause for concern. They work under the principle of photovoltaic or PV effect. Maintaining it in the long run is however a cause for concern. Solar towers or a solar water heater can be seen in most urban cities today. A solar water heater is an appliance than can be used to heat water stored in a tank. They don’t make use of photovoltaic cells. On the other hand, they absorb sunlight using sunlight collectors. The energy in turn heats the water which is collected in an insulated tank. When the first solar water heater was discovered it was a revolution as it used solar cell instead of gas or electricity for heating water