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Solar water-heating systems typically have two main parts: a solar collector and a storage tank. The sun heats water or a heat-transfer fluid that flows through pipes in the collector and then to a tank.
- Direct circulation systems pump water through the collectors and then store it in a tank.
- Indirect systems pump heat-transfer fluid through the collectors, and then transfer the heat through a heat exchanger. In colder climates, a drainback system keeps water from freezing in outdoor pipes.
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