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Why should one go for solar water Heaters?
Solar water heater saves electricity and while its payback period is up to 3 Years, the total the total saving over the life span of the product is upto Rs. 1 Lac.

No requirement of electricity or gas and Involves zero running cost - safe and simple to use.

Solar energy is a nonpolluting source of energy and helps In preservation of the environment
 

How economical is a Solar Water Heater?
A solar water heater gives amazing savings. The payback-period is generally between 2-3 years depending on the power tariff and extent of usage. So you can reduce your electricity bills substantially, resulting in long term savings.

Does a solar water heater deliver hot water during the night and through all seasons?
Yes, a solar water heater can deliver hot water even during the night, as the storage tank is well insulated. They are designed for all weather conditions, work equally well even in winters. When solar radiation is at a minimum, the in-built electrical or gas backup heater can take care of your hot water needs.

How reliable is a Solar Water Heater?
Solar water heaters are fully guaranteed for their performance, their design makes them almost maintenance free. In fact, a well installed solar water heater will give you years of trouble free performance.

What is the capacity of Solar water heaters?
The capacities available range from 100/200/300/500 /1000 & above liters and above to suit the needs of both domestic and commercial users.

What are the available finance options?
Soft loans available from banks at 5% simple interest on reducing balance with 3 years repayment period.

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How Much Electricity and money can be saved ?

The Table below gives approximate savings on electricity and money:

What is the Ideal size of solar water heater that one should purchase?

An actual estimate of daily demand of hot water is the best way to decide on the capacity of the system. A Solar system is capable of heating a fixed quantity ( equivalent to its capacity) of water on a sunny day. On as sunny winter day, on e collector (of area 2 sq.m.) can be expected to heat around 100 liters of water raising the temperature by 30-40 °C. Estimation can also be made with the help of the table given below.

in case the utility point are many or plumbing line is longer, the capacity should be expanded further.

How do they work ?
Solar water heater works on the principle of thermosyphon that hot water has lower density than cold water and thus has a tendency to rise. A selective coated absorber inside the flat-plate collector absorbs the solar radiations to heat the water flowing through Il The water circulates from the solar collector to the inner container by natural thermosyphon

How does the system function on cloudy days?

On cloudy days heating of water in the solar system gets affected to some extent On partially cloudy days some hot water output can be expected although systems are available with a suitable electric backup heater to take care of hot water demand on cloudy days

How long will the water stay hot? Does one get hot water early in the morning when the sun is not there ?

Hot water produced by the solar system during the day is stored in an insulated storage tank The Insulation of the tank is such that water remains hot with out significant drop in temperature for around 24 hrs High quality of PUF insulation ensures the same Thus water heated during the previous day becomes available for use the next morning

What is the ideal size of solar water heater that one should purchase ?

An actual estimate of daily demand of hot water is the best way to decide on the capacity of the system A solar system is capable of heating a fixed quantity (equivalent to its capacity) of water on a sunny day On a sunny winter day one collector (of area 2 sq.m) can be expected to heat around 100 litres of water raising the temperature by 30-40°C Estimation can also be made with the help of the table given below.

What is the site requirements for installation of a solar water heating system?

The prime requisite of a solar system is availability of unobstructed sunlight for the whole day The collector should be oriented due south for maximum Interception of sunlight As far as possible the area should be flat, away from rainwater drains and close to the bathrooms where hot water is to be supplied Cold water inlet to the solar tank should have a head of at least 1 m (i.e 2.5 m from the base of the system).

What are the operational requirements?
Domestic solar systems function virtually unattended
* If the system is not to be used during summer it should be drained of water and the collector should be covered
* Dust deposition on the collector would reduce its efficiency Therefore it should be cleaned at least once a week
 

What are the maintenance requirements
Solar water heating system does not need significant maintenance In case of hard water scale deposition may take place in the collectors over the years The same should be descaled under the supervision of authorised service personnel only

What is the expected life of a solar water heater?
Good quality solar water heater can last for 15 -20 years.

Are there any financial incentives from the government on these systems?
The Ministry of Non-Conventional Energy Sources (MNES) provides Soft loans with interest @ 2% to domestic users 3% -5% to institutional users from Indian Renewable Energy Development Agency (IREDA) public/private sector banks scheduled cooperative banks RBI approved non-banking financing companies intermediaries of IREDA and other public/private financing institutions (Fls) The borrowers are eligible for loan upto 85% of the cost of the system repayable over a period of five years

How does on identify a good solar water heater?
Look for some of the following specifications in a solar water heater before purchasing the same

Tank:

Rust-proof non-metallic outer body

High quality injected PUF insulation with the right density and optimum thickness for  maximum heat retention

Inner container of high-grade stainless steel like SS-304L welded using fully automatic Plasma TIG welding machines to avoid leakage

Special treatment (Passivation) for the stainless steel inner container for protection against corrosion due to hard water Electrical backup (if provided) with reliable
heating element & Thermostat cum cut-out from a reputed brand with necessary safety approvals

Collector:
Flat-plate collector with a durable aluminum frame preferably without any screw on the top face of the collector -for complete protection against water seepage

Rust-proof material for the back-sheet of the flat-plate collector

Selective coated copper absorber to ensure high absorption and low emission
Well engineered mounting configuration to lend greater stability to the entire system

In addition to this one should go for a reputed brand that ensures a high quality product and provides a high standard of service