Samo samo

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I suggest you tell more about your heating system, one can bet nobody else knows what you have.

If it is a hot water system with radiators, then read:

http://www.heatpro.us/purgeairtree/

www.heatpro.us energy businessmen's knowledge

Yes, you really have to find out the MAKE and MODEL to get good answers. There IS more than one machine made.