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are several reasons that make water heaters by thermosyphon solar are an attractive and increasingly in demand and popular:

Economic aspect: Initially it is more expensive to buy a solar heater to a conventional gas. Yet the solar heater uses free energy from the sun while the gas heater uses conventional fossil that is not free. The cumulative expenditure involving the purchase of gas every month comes quickly to match the expenditure incurred on the purchase of solar heater. It is estimated that the average recovery period of money invested in the solar heater is between 1 and 3 years depending on the use made of it.

to this we must add that the price of gas is constantly increasing, which causes the recovery time is reduced even more.
The replacement rate of gas solar thermal water heating is estimated at around 80% when properly dimensioned, and for practical purposes often substantially higher than this figure.

-Energy Independence. Having a solar heater means having a greater energy independence with respect to gas companies or electricity to heat water, with their price increases or possible supply problems.

-ecological aspects "No less important than this is the ecological implications that come with purchasing a solar heater. By not using combustion for heating water, we release a large amount of carbon dioxide into the atmosphere and contributing to global warming and air pollution. You can advantage of a very abundant energy source and free as the sun