Just replaced all of the plumbing and heating in my house except for some existing radiators/pipework. New boiler will be pressurised and I would like to test for leaks before I have the boiler fitted. I have fitted an additional 8 litre expansion vessel in the airing cupboard to assist the system boilers built in vessel. Is it advisable to fill the system to mains pressure to test/flush?
Many thanks
Many thanks