Re: Header Tank Overflow
The F&E tank should only have a splash of water in it about an inch deep.
If your tank is full and the hot water expands 4% then its gonna overflow, so you need tolower the ball arm very low... although may not have grasped your prob
alternatively you may have a primatic HWSV and the central heating has been extended... thus theres always too much water inthe system.
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