Passive Solar Heat
A solar water heater uses the sun’s energy to pre-heat household water before it enters the conventional gas (or electric) water heater. Because Southern California is blessed with such sunny weather, a solar water heater could generate up to 90% of your annual water heating needs.
Solar hot water systems are environmentally friendly and can now be installed on your roof to blend with the architecture of your house. More than 1.5 million homes and businesses in the United States have invested in solar heating systems, and surveys indicate that over 94% of these customers consider the systems a good investment.
Solar water heating (SWH) or solar hot water (SHW) systems comprise several innovations and many mature renewable energy technologies that have been well established for many years.
Passive systems rely on heat-driven convection or heat pipes to circulate water or heating fluid in the system. Passive solar water heating systems cost less and have extremely low or no maintenance, but the efficiency of a passive system is significantly lower than that of an active system, and overheating and freezing are major concerns.
Schematic Diagram of a Passive Solar Water Heater – A Very Simple and Effective Design