Discussion
Which one of the natural system is used for hot water for domestic purposes ?
Answer: A
The system is solar-thermal.
Solar water heaters use collectors that absorb sunlight as heat and transfer it to water, which is stored in an insulated tank for domestic use.
Solar photovoltaic panels convert sunlight into electricity, not heat directly. Geothermal energy uses heat from inside the earth and is not a household system in most places, and a 'solar digestor' is not a standard water heating system; digesters produce biogas.
Such systems are common on rooftops in India because sunlight is abundant and the heat needs no conversion into electricity.
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