I have a forced hot water heating system and the pipes bang when it runs. It seems that it has alot of air in the system. I leave air out 2 times a day but it still bangs away. (alot of air comes out but never does any good)

Any ideas why all the air and what can I do about it?

Thanks, it's driving me CRAZY!

Bob

Sounds like your problem maybe a bad make-up water valve. Good luck.