A Solar water heater which delivers hot water by using energy of sun is not a new product for Indian market. But due to its high cost it remained a product only for high class bungalow owners.By using latest International technology Aurangabad,Maharashtra State based company M/s Sudarshan Saur Shakti Pvt. Ltd successfully introduced a solar water heating system using Evacuated tube collector (ETC) technology. This is a “Wonder model” from Sudarshan saur available from very small size of 50 LPD to any large size as required</sec><sec id="sec002"><title>Affordable for middle class

The main feature is affordable cost i.e. about Rs.14000 for 100 LPD suitable for typical lower middle class Indian family of 6 members. Subsidized loan at the rate 2% per annum is made available by Govt. of India through many banks. User can avail 85% of the system cost as loan which will be repaid in five years effecting to a monthly installment of just Rs.250. If he would use electric geyser for heating same quantity of water his monthly electric bill would be about Rs.400. In term he will saving Rs.150 by installing solar water heating system & after five years he can earn out of this noble product.

The Technology

The collector systems works on basic principle of black body absorption. Evacuated tubes are made of borosilicate glass with special coating to absorb solar energy. The product is an assembly of two concentric, borosilicate glass tubes. The outer surface of inner tube is coated using world's latest innovative coating technology called ‘Magnetron Sputtering Technique’. This special selective black coating absorbs maximum sun energy and loses minimum energy.

The gap between two glass tubes is evacuated, resulting in high level of vacuum, which acts as the best insulation to minimize the heat loss from the inner tube. The Sun energy is absorbed due to black coating on the inner tube and the same is transferred to the water inside the tube. The water on the upper side of the vacuum tube becomes hot & light, so it starts rising in the tank. At the same time heavy cold water from the tank comes downward from the lower side of the tube.

The phenomenon is called natural thermosyphon circulation, which occurs in every tube. Due to circular shape of the tube, the full area of the tube, the full area of the tube gets sunshine right from morning to evening. Hence, the vacuum tube proves to be more efficient.

The earlier technology using flat plate collectors have copper & aluminum as major raw material. This is replaced by glass tube in ETC based solar water heaters. Hence the cost has drastically came down by about 30 to 40%.

The technology is well proven throughout the world many systems are working since last 10 years. So it is a proven technology product. The Sudarshan Saur a wellknown company in the field of solar water heaters since last 17 years is offering 5 years warranty for their Wonder model ETC based solar water heating system. Sudarshan saur wonder models are working at many corners of India since last four years.

In India we have very different ground water quality at different locations conventional solar water heater may face a problem due to hard water from bore wells. Sudarshan saur have came out with a special model for hard water named “Marine wonder” which works very well even hard water.

For low solar radiation areas like North India a special model is introduced by Sudarshan Saur named “Hot Spring Wonder”. This can deliver good hot water even in very cold climate at Srinagar.

Due to this technology innovation 80% of new solar water heaters installed through out the world are on ETC based technology

National & Global benefit

India is a land blessed by abundant sunshine almost through out the year. This is the best country in the world who can utilize maximum solar energy. The best utilization of solar energy to achieve maximum energy saving is solar water heating system. The electric geyser requires maximum connected load about 2 to 3 Kw per house, so the energy consumption in a middle class house for water heating could be about 40% of their total electric bill.

So by installing a solar water heater, we reduce

Connected load which alternately reduce the demand for more electric generation. So lot of national capital can be saved by reducing tremendous electric demand from domestic consumers. This also reduces peak load demand in morning hours, the time when majority of electric geysers are switched ON to take bath.

‘Sudarshan saur’ Reaches even upto Lower Medium class customers

Medium class enjoy solar energy benefits with ‘Sudarshan saur’

The consumption of important fossil fuel ‘coal’. Maximum electric in our country is generated by thermal stations by burning coal. There will be substantial saving in coal usage if maximum domestic water heating is shifted to solar based water heating.

Now days we have a lot about global warming & green house effect. That is all due to excessive burning of coal which produces CO₂ which is the main cause of global warming solar water heater, the best alternate for water heating can help tremendously to reduce world wide CO₂ emission level. A one 100 LPD solar water heater used by a family can reduce 1.5 tones of CO₂ emission every year. To preserve our environmental it has become very very necessary to use such noble appliances like solar water heating systems.

Due to all above factors our Govt. have realized the importance to promote such technologies, the separate Ministry called Ministry of New & Renewable Energy (MNRE) is functioning. The Govt is offering soft loan schemes & such other benefits to promote the use of these products.

Sudarshan saur, one of the Govt approved & renowned company in the field have installed thousands of systems based on ETC & FPC technology since last 17 years. The products of this company are also awarded by centre & state government. (See our adv. to know more)

Due to this technical factor these systems are very suitable even for rural & tropical areas of our country.

New economic solar water heater from Sudarshan Saur