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TS=Thermal store (cylinder) Combi TS =Combined Thermal Store in this instance an open vented cylinder with feed and expansion tank mounted on top. Water in the cylinder is heated directly from the gas boiler and stored in the cylinder at 85 degrees C. MPWS= Mains pressure water supply. MPHW=...

Can anyone tell me if this is a recognized way to plumb in a thermal store. I have a combi TS with MPHW. The circulation pump is on the return to the boiler close to the TS which I believe is correct, however this is the bit I cant get my head round. After the pump is a mid position valve which...