I've been at my inlaws to have a look at a problem with their shower. Their plumber is on holiday for a month so they can't go back to him. They have a thermostatic shower which seems to have far greater pressure on the cold feed than the hot feed even thought both are gravity fed from a tank and cylinder and passing through a 2bar grundfos watermill twin impeller pump. The result seems to be a freezing cold shower or a scalding hot one. The hot feed to the pump hasn't been taken of a flange at the top of the cylinder but with a hep tee further along the pipework which seems to be wrong according to the pumps instructions but does this explain the pressure differential? Any help greatly appreciated!
