BB stated "the mains has to go through the boilers control box and the to all the other controls on the system" therefore if you isolate the mains supply to the appliance it will shut it all down inc SWL. My question was, in this case why use anything other than a 2 pole isolator.
in that senario none, but if like me you replace boilers more than fit new installs then more often than not the boiler is the last in line not the first. with the isolation in the airing cupboard we fit the 3 pole switch for local isolation at the boiler
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