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Thank you everyone. Having never had this problem before and only recently ( 2 months ago)regenerated the air gap maybe in the past do you think it was need of regeneration? Therefore could this be reason no problems last time?

Thank you for replying. Yes let it run for a good 5 mns no change in flow.

No the stop tap is the main one into house before the MEGAFLO what is strange is nothing has been altered and reading up turning the stop tap off should stop the flow from hot and cold taps which it always did. This is a newish property and because of this system no isolating switches on...

Thank you but stop tap turns cold water off immediately.

System is UNVENTED MEGAFLO Previously I have changed bathroom and kitchen taps on two separate occasions. As far as I remember turning off the stop cock meant I could change the taps without draining. Today trying to do the same now the hot water flows at normal pressure which would mean...