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.
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 .
According to Shuman, up to what percentage of domestic hot water can be  provided by solar heating systems?
According to Shuman , up to what percentage of domestic hot water can be provided by solar heating systems ?
70
70