- Joined
- 6 Feb 2004
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- 4
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- Country
There is a small expansion tank for the CH and HW system in the loft. It fills to overflow ever so slightly. I have emptied the tank and replaced the ballcock and valve, which doesn't seem to leak/drip, but within a day the overflow pipe is dripping again and the expansion tank has filled above the ballcock again. There is no water in the ball of the ballcock, which seems to be working perfectly, but the water must be getting in somehow when the HW/CH system is on and hot water flows into the expansion tank. Mystified!