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Thank you for your comment. When house was build some 30 years ago, guy installing system did very ugly job. Second guy whom I hired was trying to make quick buck by replacing only boiler. Good thing i required inspection, so this is when heat exanger was added on with second pump expansion tank and fresh water supply to the secondary loop. All listed components are stainless or bronze because of the rust problem . The first loop was done to the old standards with poly b under the ground and 3/4" copper piping in the walls leading to baseboards. It has its own fresh water supply to, both loops keep constant pressure 18 PSI cold. It worked Ok for over 25 years until one day system overheated and instead blowing safety valve, blowup one of the poly b pipe just above the ground (lucky for me I did not get burn by the steam I was in the boiler room at the time and did not have time to turn the power or gas of to the boiler, not good experience) My biggest problem is how to correct all this