"Ed Sirett" wrote

It a pity that given that an overhaul was being done that the heating
engineer chose not to go to a sealed primary. However the boielr maynot
have been suitable, I suppose.

Thanks Ed/Mary

It was my decision not to go sealed at this stage.
Having had leaks previously in the buried piping (concrete ground floor), I
was reluctant to up the pressure on the primary/heating side.
House is 1970s build (possibly the worst phase for quality in building
history IMHO).
Prior to this period there was still some pride in workmanship, after it,
the regulations helped to restore some standards.

One or two neighbours have gone sealed/combi. Some have got away with it but
some certainly haven't!!!

Phil