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 Most
everyone has experienced passive solar water heating. How many times have you
turned on the hose in the yard and nearly burnt yourself with hot water?
The sun had been quietly working to give you hot water, even if you didn't want
it. Well if it's that easy, imagine what you can do if you're actually trying to
make hot water.
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Solar heating systems have been used since the 19th century. Nowadays the
use of solar heating is widespread throughout the world. There are many kinds of
solar water heating and there are a growing number of researchers devoted to
creating more kinds of solar water heating for many different purposes. Solar
energy is the cleanest and most inexhaustible of all known energy sources.
 Solar
radiation is the heat, light and other radiation that is emitted from the sun.
Solar radiation contains huge amounts of energy and is responsible for almost
all the natural processes on earth. The suns energy, although plentiful, has
been hard to directly harness until recently.
By installing a solar water heating system, a typical household can meet 60
to 95 percent of their hot water needs. And though they cost a little bit
more up front to install, the system will save you money in the long run as the
fuel source (the sun’s energy) will always be free. With regular inspection, the
system will operate for 20 to 30 years with minimal maintenance and costs. Flat
plate thermal solar collectors have been in use for several decades, but only in
relatively small numbers, particularly in Western countries.
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 Evacuated
tubes have also been in use for more than 20 years, but have been much more
expensive than flat plate. In recent years the production volume of evacuated
tubes has exploded, resulting in greatly lower manufacturing and material costs.
The result is that evacuated tubes are now similar in price to flat plate, but
with the insulating benefits of the evacuated tube and its ability to receive
the sun's rays from longer angles. These systems are 40% more efficient
than the conventional flat panel system and are set to become the default choice
for thermal solar applications worldwide for homes, villas, hotel resorts and
all commercial businesses.
 In
the average household, water heating accounts for around 30% of CO2 emissions.
By installing a solar water heater, which can provide between 60-95% of your hot
water heating energy needs, you can reduce your total CO2 emissions by more than
25%. Using solar and other forms of renewable energy reduces reliance on fossil
fuels for energy production, thus directly reducing CO2 emissions. CO2 emissions
contribute to global warming, an environmental issue which is now of great
concern.
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