Quick question before I drain a rad to take it off... I have a combined radiator valve and drain plug but I’m not sure what the drain off drains!
If I close the valve to stop water entering the rad and I then open the drain off nut, does the water come out from the rad or does it come from the central heating system (bypassing the fact the valve is closed)?
Simple thing but I have no idea how the valve/drain is constructed!
If I close the valve to stop water entering the rad and I then open the drain off nut, does the water come out from the rad or does it come from the central heating system (bypassing the fact the valve is closed)?
Simple thing but I have no idea how the valve/drain is constructed!