A solar circulating pump is used on split-pumped systems to circulate the water from the geyser which is located at a level lower than the collector through the collector and back into the geyser.  The solar circulating pump is driven by a solar panel.  The fact that the solar circulating pump does not run on normal 220V electricity further enhances the effectivity of the solar water geyser.

The solar circulating pump is also used on indirect systems where the flat panel is at a higher level than the indirect geyser.  Here the solar circulating pump will circulate the glycol from the panel to the geyser and back to the panel.

A solar circulating pump is a moving component on a solar water geyser and may need replacement after approximately 5 years.  On evacuated tube systems, the solar circulating pump is the only maintenance item, and therefore the thermosiphon system is recommended.

A solar circulating pump is a one way pump and does not boost pressure.  It is purely just a pump which is used to circulate the water through the panel, and should not be mistaken for a pressure pump.  The solar circulating pump can however be used on a high pressure system.