The typical flat-plate collector is used with a number of types of hot water storage systems. Generally though, there are three main kinds of tank/panel arrangements used in domestic dwellings:

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[1] PUMPED OR SPLIT SYSTEM

A mains pressure tank is located at ground level and the solar collectors are mounted on the roof. With this system, when the water in the collectors is hot enough, the circulating pump is activated and water is pumped through the collectors' water tubes where it absorbs the sun’s heat.
Advantages: The tank can be located (either internally or externally) at ground level and the panels can be above the tank.

Good for roofs that do not have the strength for a close coupled system.
Disadvantages: Needs electricity to run the circulating pump and can’t be connected to a wood stove.