Just woke up to a leak in the bathroom ceiling not what you want over the Holiday. The Header Tank in the loft for the Central Heating is the culprit and I have located the source. The problem I have appears to be with the Expansion pipe from the cylinder in the bathroom cupboard. When the Temperature of the water falls and it calls for the boiler to fire up the expansion pipe starts to empty water into the header tank. The water temperature is not excessive and by no means to hot. My system is the standard type with main tank in loft and header tank for heating. Why is the hot water rising in to the header tank from the hot water cylinder ? which is about five years old.
Any help appreciated no plumbers Polish or otherwise available over the Holiday. JD