Our tank is an Akvaterm solar plus which has an additional coil to the Akvaterm solar tank. There is a controller shown on the diagram here as a sort of white cross near the solar panels on the red lines. This puts the fluid from the panels through the top coil when it is above a certain temperature, otherwise it just goes through the lower coil.
This is the controller. It has a fixed temperature at which is sends via one route than the other
This is the pipework for the solar input and the hot water output
This is all the instruction manuals for the heating
We have asked the installed what temperature the controller switches at, because as far as we can tell it almost always or possibly always loads in to just the bottom of the tank. It is not a problem as such, we are not losing energy it is just not the most efficient way as the tank needs to be hot at the top for the domestic hot water (shower etc). We bought the more expensive tank with the second coil to get this efficiency, so it is annoying if it never uses it for some reason.
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