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.[42] 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.[43]
As of 2007, the total installed capacity of solar hot water systems is approximately 154 GW.[44] 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.[45] Israel and Cyprus are the per capita leaders in the use of solar hot water systems with over 90% of homes using them.[46] 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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