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Thank you for the posts, looks like I have everything under control for now I did everything that you guys suggested, plus i had almost new Grundfos circulator from old boiler so I have swap cartridges from regular circulator to stainless casing of the existing pump (I hope this is ok). Bleed the system and runned for .5 hr no more noise-silence is golden. My hydronic system with heat exchanger was never flushed after initial flushing @ time of the boiler replacement. There is lots of magnetic debris-rust any suggestions ? Thank you guys for all the knowledge and help. Ps: There is two pressure/ temperature gauges, one for boiler loop and one for heating side. Both read about 20 PSI Hot Thanks