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I may have been confused, there are two overflow pipes; one from the small tank above the hot water tank and another overflow pipe somewhere between the two tanks. This one is dripping constantly whenever the hot water is switched on. The hot water tank is old, I would say at least 15 - 20...

I have a Thorn Appolo boiler which feeds a hot water tank for the central heating and hot water. There is an overflow pipe from the hot water tank which has been dripping constantly whenever the tank is hot. (is this an indirect system?) What do I need to do to stop the dripping?