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Hi all. I have an Open vented central heating system with a back boiler. Last night I was awoke by a bubbling noise (about 3/4 seconds) within the hot water tank in the airing cupboard with a small amount of water coming out of the Open vent pipe into the header tank above the hot water tank. I...

Upon switching the hot water and central heating switch to the on position, our back boiler kicks in and seems to be building up pressure for a couple of seconds before a flame licks out of the top of the boiler (behind the fire) and the boiler starts heating up the water. Ive never noticed this...