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The vent pipe is constantly flowing into the top of the expansion tank, a small ammount is dripping out of the overflow, but nowhere near as much as flowing in. Im on a mission to understand how it all works, but cant work out where the excess water going into the system is ending up? Sorry for...

Hi, any thoughts much appreciated. thanks very very much for reading my story Boiler cupboard in the corner of the flat lounge has once in a while made very loud bursts of groaning/howling/deep vibrating noise . I thought it was a blowing over bottle effect of the wind on the vent outside...