Coil in hot water cylinder has a hole in it,allowing CH water to get into domestic hot water,as exp tank higher than CW tank,and coming back up the outlet making the tank overflow.
thanks Garfeild
Does this mean it would not happen if my exp tank was below c/w tank and were the tanks fitted incorrectly 25 years ago
Can we prove coil is leaking or just change the tank and hope it cures it.
Tank is about 5 years old or less. I know this means not a lot but a bit unexpected
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