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The vent is just a screw off cap at the top of an upright pipe leading from the pipe that's on the HW side of the motorised valve. I get a little air from here sometimes when I'm bleeding the rads. There's no oher vent on or near the cylinder. The boiler was off when I drained the system, but...

Thanks for the suggestion. Unfortunately, we've just had new carpets / flooring laid in all rooms, so that's not really an option. Any other suggestions??

Hi I have a gas CH/HW system, with a Potterton Suprima boiler on the wall in the garage and a Grunfoss 15/50 pump in the airing cupboard next to the hot water cylinder. Oher than a single air release thingy near the pump, the only bleed valves are on the rads. I recently drained my CH/HW...