Hello. I have noticed that there is a little outlet valve at the bottom of our boiler from which water is coming out and has made quite a puddle on the ground, so it could have been happening for a while. Sometimes the water just drips and at other times it comes out a little faster. The central heating and hot water are working a treat. Any ideas as to which there is water coming out. I am guessing it is some kind of overflow valve. Forgive me for being so thick about this!