A solar water heater collects solar energy directly from the sun and converts it into energy source that provides heat to the water and can be received in bath areas. Solar water heater can be the perfect source of renewable energy, especially for a region like Tamilnadu.
This consists of several units including a solar panel , Tank to store the water and a mechanical pump to circulate the water. The solar water heater designed should have the capability of cutting off in case of over heating in the tank and should also be freeze proof.
There are two types of solar water heater panels – The flat panel and the evacuated tube model. The flat panel collects heat from the sun ,a flat plate like structure which are connected to pipes containing fluids to heat water. Evacuated tube model (ETC) are designed in ways to reduce heat loss, it has two concentric glass tubes with vacuum with withholds the solar heat even to be used in case of absence of solar energy . ETC models are way more efficient than flat panel but in case of consistent availability of solar energy flat panel can be preferred as it is more economical compared to ETC.
The most basic solar water heater starts from 15,000 rupees for 100 litres/day and the range varies depending on the capacity and the technology adopted in the particular water heater.
The main advantage of solar water heater is that promotes a clean and healthy environment , Saves heavy electricity cost , reduces carbon foot print .It works good on the long run plus you get tax benefits. It is always better to switch over to non exhaustible resources as a environmentally responsible individual.