Air in system

[camerart]

Hi,

Can air be sucked into a vented central heating system? I have bled the system a couple of times, since adding inhibitor, but I still hear air bubbling up from the boiler (floor level)

Pumped heating, thermal hot water, gravity fed.

Cheers, Camerart.

 

[dcawkwell]

Yes. Vented systems suck. Go sealed system.
bleed the system with the pump not running.

 

[Gas2Air]

Not if piped correctly.

 

[camerart]

I'm not sure if it piped correctly, it's been installed a long time. I always bleed it with the pump off.

If it's sucking in air I presume there's a leak somewhere.

Thanks, Camerart.