Hi hope someone can help my water & heating, are run by a potterton 80f boiler. The pipes from the boiler are 28mm to the pump, 28mm from the pump to a tee,which is 28mm at the top 22mm going to a 3 port valve & 15mm to the bath rad.After the valve there is a lot of vibration, it sounds as though its going through the rads & the joists. But i cannot find any pipe touching the joists.I would be greatfull for any ideas.many thanks