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Thank you.

In my case the EV is also ~12M higher than the boiler and the pump so hopefully that helps keep the system pressurized.. So what I'm understanding from your last sentence is that the extra 1bar or so of pressure that the EV affords the system is why it's more critical in an open vent system to...

I did, it has boiler, then vessel, then pump (on the hot side) but unlike for for open vent systems the manual doesn't explicitly state that the order is important.

Thanks @cross thread. Could you explain why?

In a sealed multizone CH system, does it matter whether the pump is between the pressure vessel and the boiler or whether the pressure vessel is between the pump and the boiler? (On the hot side in all cases) I know it matters in an open vent system but not sure in a sealed system. Thanks in...

Hi everyone, I've been experiencing some constant air bubbling noise on the top floor of our house. I've done some investigating and I think I know what's happening but I'm not expert so I figured it would be best to check with people in the know. I've tried to map out the system so here goes...