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Hello Andy, Your suggestion about shutting off the incoming main water supply sounded good, so I did as you suggested with to me, a very surprising result. After the C/Heating had shut down and all other services declared unusable, I lowered the level of the water in the Cold Water tank and...

Thanks Andy, I will give it a try, see what happens and let you know. Ralph

For some reason, Hot Water is finding its way into the Cold Water tank, irrespective of whether the C/H boiler is on or off. All of the system's various cocks and valves have been systematically closed and re-opened in sequence, in an attempt to isolate the source of the transfer, but so far...