Recent content by dexus

The AAV was closed recently, just to demonstrate that it wasn't the AAV that was permitting air in. It's usually open, and has had plenty of opportunity to bleed out any air in the HW circuit. Agree that adding fresh water is bringing more air into the system, but I need to bleed the...

Three month old sealed system: Vaillant 630 system boiler (integral pump) in garage New hot water cylinder in airing cupboard on first floor. Vertical distance < 2 metres between cylinder flow/return connections and boiler. New three-way valve and new above-floorboard pipework...