I think I could have a small leak in my central heating system. There is no signs of water damage anywhere or signs of leaks/drips on accessible pipes. The water pressure on the boiler will reduce to a measurement that will not allow the boiler to operate (hot water and heating shut off) This has taken a period of about 10 weeks from a new boiler being installed but did also happen with old boiler. The system is all copper piping, so rather than rip up all the recently laid flooring, I would prefer to add a leak sealer to the system. Is this a fair solution? Does it work? What is the best product to use? I have seen Kilrock and fernox products on the shelves at the sheds but not visited any merchants. Any help/advise would be much appreciated.