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Thnx again. Looks like I'll need to go back to school and redo physics to understand it fully!! I'll get a plumber in....

Thnx for prompt reply. I am puzzled how a cold feed blockage creates a hot water overflow problem, are you able to explain please?

I have a vented gas central heated system. Currently when the domestic water is running at the same time as the heating, hot water overflows into the feeder/expansion tank in the loft, this does not happen when either the hot water or heating run separately. I have a Potterton Profile boiler...