I
iwol
hi all after having the c/h header tank overflow gushing out a couple of weeks ago i had some great advice and turned the pump down to no.2,which seemed to work ok..but ive just noticed my outside wall getting damp near the overflow pipe,because the pipe is slightly going up i cant see it dripping but it must be just slowly running back down the pipe onto the wall...the ball valve isnt sticking because ive taken a bit of water out the tank and the valve isnt operating,and there is no water coming in via the top pipe so could it be coming up the cold feed and if so why please thanks iwol..