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In page Solar water heating:
"Active systems use one or more pumps to circulate water and/or heating fluid. This permits a much wider range of system configurations. Pumped systems are more expensive to purchase and to operate. However, they operate at higher efficiency and can be more easily controlled. Active systems have controllers with features such as interaction with a backup electric or gas-driven water heater, calculation and logging of the energy saved, safety functions, remote access and informative displays.[citation needed]
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