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Thanks very much for the reply Madrab. So I think you’re confirming that the installer’s test is valid, though I still don’t quite grasp how. Was I right that a standard 1/2” tap would generally not deliver more than ~15 l/min when attached to a 15mm pipe? And if so, how does it give a good...

I'm in the process of considering an unvented cylinder to replace the existing gravity system. I know that unvented systems are only as good as the pressure/flow rate that supply them, so I'm anxious to make sure these are adequate before I give the go-ahead. The pressure has been measured at...

Just for the benefit of anyone else who has this problem, it did indeed turn out to be mixer tap related - and in fact it was more than one mixer that was the problem. I hadn't troubleshot it properly in the first place because I had tried to isolate the mixer causing the problem by turning...

Ok, thanks Jeff.

I appreciate it isn't rocket science. But the reason I'm asking all this stuff is because you know considerably more about it than I do. I know it's a process of elimination, so could you confirm that if non-return valves have been fitted to a mixer then that eliminates that mixer from the...

Thanks for the reply, very succinct :) Would you agree that any mixer that has new non-return valves on its pipes can be ruled out? Or can they still cause problems?

So an update on this, because it's still not fixed and the plumber's scratching his head. Per the previous post, I tied up the ballcock in the F&E: no difference. It appears the F&E tank level never moves up or down, or only by fractions. It's worth noting that though I previously said...

I've tied up the ballcock this morning in the F&E. See what happens.

I could more readily understand this if the problem happened when the shower was running, but this happens when nothing's happening on the system. That bathroom shower hasn't been used since Tuesday and the en-suite since yesterday morning, but still through the day yesterday and overnight last...

The F&E sits at the same level as the CWT.

How would I know if it's falling? It doesn't have a pressure guage. The radiators are perhaps not as hot as they usually are - though I didn't really check them obsessively until this started happening so it's hard to be sure. And how come it would just start to happen as a result of the...

Apologies in advance for the length of this post, but I'm trying to anticipate everything I'll be asked. Our bathrooom was refitted last week and its standard radiator replaced with a towel radiator (exactly the same as we had done in the en-suite the previous year). Not long after the system...