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A thermosyphon refers to the passive heat exchange, based on natural convection, which circulates liquid without the necessity of a mechanical pump, within a Solar Water Heating system.
In this kind of installation, you will find both the geyser and the collector on the outside of the roof.
Advantages the thermosyphon
No circulation pump is needed, this will save money on both installation and maintenance.
Controller (geyser wise) will be optional depending on, the need to controlled electrical back-up.
Disadvantages the thermosyphon
Overheating can occur when water is not usage. Example of this is when you are away on your summer holiday.
The appearance of a geyser and a solar panel on the roof of a property may have a negative effect on the exterior look.
Pump-Circulated (Split) Solar System
A Split system uses a pump to circulate the water from the geyser, up through the collector panel and back to the geyser.
In this kind of installation, the geyser is in the ceiling or garage and only the collector is on the roof.
Advantages of a Split Solar System
Overheating can be controlled by the pump and geyser wise. During normal operations, the geyser wise will not allow circulation once a temperature of 80°C is reached. By setting your geyser wise on holiday mode you can enjoy you summer vacation knowing that the geyser wise will control the heat between 50°C and 80°C by allowing circulation to cool water temperature down.
The solar panel on the roof of a property will not have a negative effect on the exterior look.
Disadvantages of a Split Solar System
The circulation pump will cause a slight increase in the cost of installation and maintenance.
All Pump/Split Solar Systems will require a controller (geyser wise) and will cause a slight increase in the cost of installation and maintenance.