I've woken up the last few mornings to find a small pool of brownish water under our boiler. Finally got round to taking the boiler cover off and it appears to be coming from some sort of valve/connector on the pipework that runs from the top of the boiler. No idea what the 'valve' does but rather than try to explain it, I've posted a few pics here
The water is a slow drip from the central hole, and I think that whilst the boiler is running it is evaporating the drip before it has time to run down to the bottom and hence it doesn't materalise during the day.
The pipework is about 30 years old (as is the boiler) but I hope to re-fit the kitchen early next year. Rather than hack the pipework to pieces now do you think I can get away with sealing the hole (plumbers mait ?) for 6 months or so.