Leaking bathroom ceiling

grumbler wrote: »

What water heater? Immersion electric heater in your cylinder?
If so, the water expands a little in the cylinder and the level in the tank can increase, but the change will be so small that is extremely unlikely to cause any leakage.


However, if some pipe or connection is faulty I can imagine that when hot water fills the pipe the leakage can increase.

Well, got a better plumber out and got the leak fixed
It was the overflow pipe that had the leak, on top of that the first plumber who replaced the ballcock didn't do it correctly in the first place - fortuantely the current plumber replaced it for free.

Its been fine for a day, but now I have water dripping from my smoke alarm next to the bathroom....great.....