Solar hot water systems use sunlight to heat water. In low
geographical latitudes (below 40 degrees) from 60 to 70% of the domestic hot
water use with temperatures up to 60 °C can be provided by solar heating
systems. The most common types of solar water heaters are evacuated tube
collectors (44%) and glazed flat plate collectors (34%) generally used for
domestic hot water; and unglazed plastic collectors (21%) used mainly to heat
swimming pools.
As of 2007, the total installed capacity of solar hot water
systems is approximately 154 GW. China is the world leader in their deployment
with 70 GW installed as of 2006 and a long term goal of 210 GW by 2020. Israel
and Cyprus are the per capita leaders in the use of solar hot water systems
with over 90% of homes using them. In the United States, Canada and Australia
heating swimming pools is the dominant application of solar hot water with an
installed capacity of 18 GW as of 2005.
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