Solar power energy can be used directly to heat any fluids, which in turn transfers the heat to the water. This is known as passive solar energy as it does not require any pump to circulate the heat. It can be used very efficiently for production of hot water, or even for warming up the house. So in principle yes you can heat 240 gallons of water with only solar energy.
To that end, you still must have a solar collector of sufficient size. In areas where sunshine is plentiful, a solar water heater can provide the entire household needs with hot water. You can find out how much water you need for your household by estimating that each person uses approximately eighteen gallons. This includes water for food preparation as well as sanitation, simply do the math.
A passive solar water heater may not be suitable to heat large buildings or to provide large amounts of water, but for a small household it is a perfect solution that will reduce your energy consumption and save you a considerable amount of money
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