Summary: Learn how to re-fill a central heating system.
There are various problems that may require you to drain your central heating system in order for it to be repaired. And in each case it is important the system is re-filled correctly. The advice given is for an open-vented system; the most common type used today.
Starting on the ground floor, open one of the radiator air vents and when water comes out in a steady flow, close it.
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