askthe coffeeguy wrote:
So what was the problem in the end? Sounds like a water flow restriction problem - as previously mentioned could be a blockage at the group head which potentially could be fixed by removing the shower screen and giving it a good flush out?
Hi Pat, sorry for the late reply... multiple things in the end; this has turned out to be a bit of a nightmare 😢 Bill initially did an acid soak to get rid of scale buildup, then replaced the inline return valve, which seemed to have failed. After he replaced this, it began leaking from the 'elbow' as the thread had apparently corroded away - see pic ??? Basically the thread has totally disappeared, so he's going to drill and retap the elbow. It's pretty shocking mess (see pic); I asked him how he thought it could get so bad (eg 'operator error'?) and his answer was that it's likely because of dissimilar metals between the boiler/thread and the elbow; probs didn't help that for the last few years i didn't use unfiltered water - he says Adelaide water's pretty 'corrosive'.
