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I have completed the experiment of closing off the supply to the 'Central Heating Tank' and the water level has still increased. I have watched the water overflow through the vent pipe and estimate it to be approx 1/8 to 1/4 a cup full every 1/4 hr.
I can but think this extra water can only come from one source, ie, the hot water cylinder but as I mentioned I did conduct the known test of isolating the supplies to both expansion and feed tanks and measuring the difference overnight (there was none). Are there other tests or should I be looking at something else?