We get a small leak from around our hot water cylinder when the power to it is switched off. I am not sure if the leak is coming from the cylinder or the pipes supplying hot water to the house. There isn't a leak when the cylinder is turned on.
I'm not sure what could be causing this but if itâ€™s your cylinder it HAS to go. A leaking cylinder is anything but good. You might like to try getting in touch with an excellent cylinder manufacture in Scotland:
Some years ago I had a leak from the seam around the top of my hot water cylinder. Managed to stop it using Plastic Padding's Chemical Metal product. However the leak returned after about a year and I had to change the cylinder. What you say about the leak stopping when the system is switched on suggests that the leak may be on a joint in the pipework, maybe one of the cylinder connections. As others have said, you need to find out where the leak is.
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