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dhw temp control (this is a system boiler)

hi could any one tell me what the water dial is ment to do on this boiler

its on a valliant ecotec boiler i have had fitted, its just i was reading through the manual and saw it and wondered if i closed it the front roon radiater would heat up quicker

ow right cause mine has one in, does it have anything to do with the speed that radiaters get hot ,like if i close it a bit (screw inwards )it would make the rads get hotter quicker

hi just wondering whats the system bypass for on a boiler

hi guys ive brought a new wall stat but no quite sure as to where the wires go into my 10 way box as the box is wired to honeywells wiring here is the stat i brought could you tell me which wire goes where http://www.sunvic.co.uk/tlx7501rt.html