A very generic question, but what sort of pressure loss in a central heating system is considered to be 'okay', I.e doesn't warrent any further leak investigations?
I started with a loss of about 0.5bar a week, reduced that to 0.1bar a week by replacing some old cast iron column radiators that were weeping at the joints, and reduced it to 0.1bar a month after fixing a leaking spindle on a towel rail.
My only remaining suspicion is an isolation valve that's a bit corroded and the pipework below it is a little green, doesn't feel damp and nothing obvious with a tissue paper test. To change it would require a complete drain down (it's in the cellar). So the question is, do I bother, or just leave it as is for now and just remember to replace next time the system needs draining?
System water volume is probably 150litres and I have a 12litre expansion tank. Pressure is currently 1.1bar, and rises to 1.6 bar when heating is on full.
I started with a loss of about 0.5bar a week, reduced that to 0.1bar a week by replacing some old cast iron column radiators that were weeping at the joints, and reduced it to 0.1bar a month after fixing a leaking spindle on a towel rail.
My only remaining suspicion is an isolation valve that's a bit corroded and the pipework below it is a little green, doesn't feel damp and nothing obvious with a tissue paper test. To change it would require a complete drain down (it's in the cellar). So the question is, do I bother, or just leave it as is for now and just remember to replace next time the system needs draining?
System water volume is probably 150litres and I have a 12litre expansion tank. Pressure is currently 1.1bar, and rises to 1.6 bar when heating is on full.
