feed tank warm water!!

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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.
 
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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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