I have had a shower fitted, the hot water feed comes off the same pipe that feeds the bath tap, the cold is from the mains. Since having the shower fitted the cold water tank in the loft is overflowing (through the overflow pipe) but with hot water which I think is coming from the vent pipe. The shower itself works perfectly. Sorry, not sure of the make or model shower but it may be Kube. Any ideas what the problem may be?
Roger
Roger