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Sorry forgot to add.. I discovered some drops of water coming from one of the pipes below the boiler, around one of the large nuts. The amount that drips out is very small and barely covers the bottom of the small bowl i have placed underneath - its evaporates quicker than it leaks. Is this...

We have a gas fired central/water heating system. When we require hot water (taps or shower) the boiler fires up and heats the water when tap opened and will then run fine for several minutes. Then there will be a knocking/banging from the boiler (in the kitchen), the pressure reading...