condensing boiler for heating and a seperate hot water heater with flow and return system otherwise hot water will take years to pull through on a system of this size
Have actually had the yorkshire rep out on one job and he aggreed to replace all olives eith ones of a better quality as the cheap rubbish from china where not compressing onto the pipe causing several major floods on this job
british gas have a habit of looking at peoples systems and trying to recommend anything they dont see on the system to make more profit
using their engineers as salesmen
you can source rod magnets with a 10mm hole in the top on the net
10mm bolt through screw cap end to hold magnet
unscrew top to remove magnet and clean
outside you could as i did set up a set of valves with bypass so you can clean as you go
SIMPLE!!
A couple of years ago i made my own powerflushing filter with soil pipe a screwed cap end with magnet fitted to it and a couple of bosses to 22mm cost about £120 cheaper by far than £300+ wanted by manufacturers