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Solar hot water works well in buildings that have significant roof area on which to locate solar collectors. A solar hot water system should provide between 40 and 60 percent of your hot water needs. Solar hot water systems come with electric or gas boosters to provide the remainder of your hot water needs. Solar hot water systems use solar collectors – either solar panels or evacuated tubes – which absorb energy from the sun to heat water. The heated water is then stored in an insulated tank until you need it. Typical applications are in dairies, piggeries and worker accommodation.