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A solar water heater cannot be used to g...

A solar water heater cannot be used to get hot water on ……………..

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a cloudy day
a sunny day
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In high rised residential flats, maintainance expense per month per flat is high. Some members suggested to install solar panel and solar water heater. They explained that this would provide some electricity to light the building and may reduce electric bill amount. Which energy conversion is achieved by Installation of solar panel and solar water heater ?

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