Hello all. My 28i junior has scale in the heat excahnger due to the hard water here in berkshire, hot water pressure is now at a dribble. A couple of weeks ago I fitted an electronic descaler and this appears to have made things worse - is it scale comin goff inside teh system and getting clogged in the heat exchanger? The kettle now gets a lot less scale, barely any. I have been advised to change teh heat excahnegr outright, but am contemplating either paying to flush teh system, or take out the heat excahnger and get it cleaned out. The boiler has two heat exchangers, primary and secondary, whcih one needs cleaning? I would be grateful for any advice.