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Solar Hot Water System

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With hot water solar heating panels that heat a copper cylinder with no pump, to an internal heating coil, does the "flow" from the solar heating panel run to the top of the coil in the copper cylinder or the bottom, bearing in mind that with a gravity system hot water rises?

Z.

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    With no pump in the solar panel circuit, the solar panels have to be BELOW the hot water cylinder, just as a solid fuel boiler has to be below the hot water cylinder. This can be achieved by mounting the panels at low level, for example in the garden or on a garage or other lower roof.

    The pump is generally mains powered, but some systems use a small PV module that drives a DC pump. A mains pump needs a differential thermostat that only runs the pump when the solar collector is hotter than the water tank. A direct PV driven pump needs no control.

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    With no pump in the solar panel circuit, the solar panels have to be BELOW the hot water cylinder, just as a solid fuel boiler has to be below the hot water cylinder. This can be achieved by mounting the panels at low level, for example in the garden or on a garage or other lower roof.

    The pump is generally mains powered, but some systems use a small PV module that drives a DC pump. A mains pump needs a differential thermostat that only runs the pump when the solar collector is hotter than the water tank. A direct PV driven pump needs no control.

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