Because most often, condensing boilers are sealed system, not open vent.Why?
Not all, I know. I am quite eccentric and I chose a Vitodens Compact.
Because most often, condensing boilers are sealed system, not open vent.Why?
2. Yes, the header tank does have its own isolator tap (in the airing cupboard) and I've been turning that on to fill the header tank. The header tank is filled by mains, there is no tank above it.
What can I do?
I hardly know what to think now.....
So - bung the outlet of the heating header tank. Fill the header tank up to the overflow.
Turn the house water off. All should be quiet.
Get someone to release the bung from the header tank outlet.
Can you hear water running in the suspect area?
John
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