hi, quick silly question- is the boiler drain off cock on ideal isars and icos', the copper coloured nipple at the bottom front right of the main heat exchanger? if so, how would you get a hose on it as its too small?
Over the years i have collected different size of hoses to use on silly size drain offs,even going as far as using the neoprene pipe on your manometer I normally have bits of different diameter hose some available from b&q and specialist hose suppliers even got some one day from tropical fish place As long as you can get it to drop into your main hose or bucket you will be fine