I am wanting to re-route the cold water mains supply to my combination boiler. I understand how to recharge the CH system should I have to, however what I am wanting help with is... if I cut off the supply to the boiler and cut the pipe to re-route the piping how will this affect the feed to the boiler which generates the hot water to my taps. Can I do the work and just reconnect the supply... will the combi boiler work as previous to the work.