I have a Myson Orion boiler which is at least 18 years old. when I bought this house eleven years ago, the central heating/hot water system would not run.
A local Corgi heating engineer attended and reported that the circulating pump had failed. He replaced the faulty pump and the system has not failed in 10 years.
I hope that this info. is helpful
David, Paisley.
David
November 2007