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I've recently uncovered some of our CH pipework and realised that the majority of it is a one pipe system. Only two of the upstairs radiators have separate flow and return pipes (and the return is 15mm). Putting a two pipe system in upstairs is quite a simple job, but is more difficult...

The boiler has got a drain point inside it and I used that. I must admit I keep reading about prv's, but I can't see one in my boiler. There is what looks like some sort of release valve at the entry point to the hot water storage tank, but there's no sign of air or water escaping here...

I've looked at the Auto Air Vent when I top the system up and there was no sound of air escaping or water leaking out. I haven't tested the pressure on the EV, but could do that when I get home (only with a basic car tyre pressure gauge). Are you thinking that it could just be a faulty gauge?

After partially draining our system to remove a radiator, I refilled and bled the radiators but I've noticed that the pressure gauge keeps dropping to almost zero. I keep using the filling loop to bring the pressure up to 1 bar, but within an hour it will have dropped to 0.5 bar even with the...