I have a baxi combi boiler with a heat exchanger but the flow switch is
leaking.......just needs a new washer( i hope!!). I wanted to know how to
isolate this flow switch so I can put a new washer in question is I don't
know how to do this. There is a wheelhead valve just a bit further up the
pipe, will this isolate the valve or will I have to drain the whole system
down?

dIMM (name says it all!!)