Bilbonic, don't give up your day job is my advice to you fella
You may know your binary or Hex code but certainly not the expansion vessels
Umm what do i not know, water expands when it gets hot
Learnt that in primary school, being a plumber would bore the hell out of me tbh, ANYONE with half a brain could do it after a 2 day course
As i stated i fitted my 701 in 1997, if i had let a plumber, sorry Gase Safe Engineers.. do it it would of probably been condemned by not..
You keep unblocking toilets and i'll stick to what i know, that includes plumbing!!