TRW Energy
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The cylinders are mains pressure dual coil so you can run solar through one and the boiler (wood chip or other) through the other coil and the hot water comes out at mains pressure.  They also have an immersion heater in them as well and they are fantastic for a house.  You need an expansion vessel on the solar system as the water in the tubes can turn to steam can.  You require some way of controlling the pump, as the pump can use more energy than the sun supplies if you’re not careful.  The controllers we have are very good and they have a timer so they can turn on the central heating, pump, immersion heater etc. 
For enquiries ring Tim 07713585196