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That's interesting, but I don't think that the boiler is capable of delivering anywhere near 25l/min through the coil - I don't have the spec to hand, but at high temps I think it's around 10-15l/min. Also it's not a constant sound, it's a periodic gurgling which does very much sound like air.

I'm sure the boiler's AAV is open - that's why he checked to make sure it was working. The coil AAV was put in yesterday to replace a manual bleed valve and yes, that valve was emitting small amounts of air when bled. Now that it's automatic I can't tell of course, but I assume it is still...

Online sources for the boiler? I don't think I said which boiler I have - it's the Greenstar 30i System Boiler. I believe it has the optional integral diverter kit installed. If there is a mode that can be activated to release air through boiler settings it would be great to know how that is...

It's a 300L Gledhill StainlessLite Plus HP model # HP300IND. It's attached to a gas boiler for rapid heat-up. The HW coil is top to bottom. It has an external expansion vessel, mounted above the cylinder. The AAV is in the photo above (on top of the vertical pipe to the left of the cylinder...

Hi there. I've just had a brand new heating system installed. Worcester Bosch system boiler with optional internal diverter kit, HW output connected to Gledhill unvented cylinder and CH connected to the rads. I believe this is referred to as PDHW or X-Plan - the boiler is either heating the...