I have a gravity fed hot water system and foolishly let the header tank run dry. I think I have air in the system and this is stopping the boiler from heating the water. I can't find a way to bleed the air out, can anyone help me?
Fill the system from the bottom.
the usual trick is to fill it from the bottom upwards. Assuming you have a drain c*ck at the lowest point, attach a hose to this - with the other end connected to a mains cold tap. Open the drain c*ck and then open the mains tap (gently). This should fill the pipes and expel all the air out of the vent pipe.
Thanks for that, gave it a try but as soon as the weight of water built up it started backing out of the drain c*ck valve. This was before it had reached the height of the feeder tank. Any ideas?
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