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yes it is. it just makes a gurgling sound when it heats up

Can I not just bleed the system to get the air out, just like you would a radiator?

I recently had my system drained to move my water tank, and I now think I have air trapped in the system, as when I turn on the hot water I get a gurgling sound. I did not have this before the system was drained. can anybody tell me how I remove the air please