Buyers can choose from two basic types of passive solar water heating systems. The most economical, and simpler of the two is an integral collection and storage unit. This system consists of an insulated water storage tank that is often painted a dark color to attract and absorb solar energy. Water supply pipes enter the box, and the water inside is naturally heated by the sun. This water then passes into the home for use at plumbing fixtures, and more fresh water enters the tank for heating.
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