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I am currently specifying a system that will provide back-up CH/DHW to a proposed solar thermal installation. The current boiler setup is W-Plan (CH-ON powers the valve giving CH only, 3-wire Cylinder Stat "call" cuts CH-ON power to diverter and diverter goes to DHW only). The Solar DHW...

I have had the same sort of long running problems with the DHW side of a Potterton Statesman Flowsure (not the "plus") as many others and have decided to take the advice of Gasguru from some years back and take off the plate heat exchanger and re-configure the boiler as a conventional S Plan CH...