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Come to think the water did feel warm ish in the tank??

No nothing.

Ok thank you so the expansion pipe above the bigger cold water filling wouldn’t be the reason it’s over flowed? More likely the ball cock?

The bigger one is the highest. I think. There’s not much between them.

Thank you. I had read that a hole in the coil could cause the water to rise through the expansion pipe. Is this in the smaller tank rather than the cold water tank?

Hello, I have a quick question regarding my heating system. The cold water tank in the loft over flowed today and there is a hole in the overflow pipe. The ball cock appeared to be working correctly. Could the water have come out of the expansion pipe and filled the tank up? The bath was running...