Page "Autonomous building" Paragraph 79
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The basic trick in a solar water heating system is to use a well-insulated holding tank.
Some systems are vacuum-insulated, acting something like large thermos bottles.
The tank is filled with hot water on sunny days, and made available at all times.
Unlike a conventional tank water heater, the tank is filled only when there is sunlight.
Good storage makes a smaller, higher-technology collector feasible.
Such collectors can use relatively exotic technologies, such as vacuum insulation, and reflective concentration of sunlight.
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