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Constant Temperature : Variable Volume (Active System)
EcoSol SunHarvester use this system because it is more effective. There will only be hot water stored in the tank, as with this system there is no need for cold water to enter the tank so the next morning the user can still enjoy the hot water stored in the tank.
The temperature can be set depending on what is required, the sensors and solenoid valve are controlled by a microcomputer.
Constant Volume : Variable Temperature (Passive System)
This is the conventional system using thermosiphon, there is a large thermal mass that has to be heated also cold water has to enter the tank in order for hot water to be drawn off, which means that in the morning the water is usually just luke warm.
With only 3 hours of sunshine this system will not reach the required temperature.