I have a newish Valiant heating/hot water system. The hot water is not getting as hot as it used to. I have turned the setting on the boiler up a few degrees to 61 and same on tank but water not getting hotter . I have one radiator on and that gets hot but not very but water and heating are getting hot each time

GG, August 2010

are you saying that when you run a hot tap the radiator also gets warm? if so then you need a new diverter valve.

Ian, August 2010