It is observed that the consumption of conventional energy source has caused more environmental damage than any other human activity. Electricity generated from fossil fuels such as coal and crude oil has led to high concentration of harmful gases in the atmosphere. This has in turn lead too many problems such as global warming. The energy sources such as the Sun, Wind, Geothermal, water, bio mass etc can never be exhausted and therefore are called renewable. They are source, which are ecologically safe and almost infinite, or would replenish themselves in our lifetime.

India is one of the few countries with long days and plenty of sunshine. The Sun is the single largest source of energy for the entire solar system. In less than 1 hour of daylight, the SUN releases upon the Earth an amount of energy that is consumed by the entire population of the planet in 1 year. This energy is clean, it is renewable, it is free, it is abundant and it is everywhere. This makes it one of the most promising alternatives to the conventional energy sources.

Solar Water Heater is a device that uses solar energy to heat water. A solar water heater comprises a blackened flat plate collector with associated metal tubing, facing the sun. The collector is provided with a transparent glass cover and a layer of thermal insulation beneath the plate. The collector tubing is connected by a pipe to an insulated tank that stores hot water during non sunny periods.

Basically it is a thermosiphon system works on principle that warm water rising above, it is also known as natural convection. As water in the collector heats, it becomes lighter and rises naturally into the tank above. Cold water flows from the bottom of the storage tank to the collector, from which heated water rises to the top of the storage tank.

After initial investment at the time of installation of the system, there are no operating costs, no or very low maintenance, hens it gives hot water free of cost after installation. Whoever invests in a solar heating system is also investing in the future. In addition to that using solar water heating system, one is actively contributing to the lowering of environmentally harmful CO² emissions.

Generally redren collector is designed to provide a daily temperature rise of around 35-50oC in good weather condition. For Indian, design a domestic system which gives hot water at 60oC in winter. However for industrial application system can be design to give any output temperature up to 90oC.

Under normal working condition no or less maintenance is required.

Redren solar collectors can be connected in series or parallel to get large amount of hot water for a commercial setting such as a hostel, hotel, industry, or office building. There is really no limit to the size of the system.

Using a solar system to heat a swimming pool is the most common now days. For large scale swimming pools, solar water heating system may be an extremely viable supplement to gas or electricity. Solar pool-heating systems increase pool's water temperature by 10 degrees or more, and they can extend the swimming season by two to three months.