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On page 51 of the "Lost Art" I have noticed a picture of a header hookup with the caption "Never do this!". Well it's exactly what my installer did 15 years ago! (see photo). My system is perfectly silent for the first week or so of the heating season and then I start getting banging in the line leading up to the third floor (see photo). Could the header piping be related to the noise? (I can't remember if there was the same banging with the old boiler - that was a long time ago and I was living on the first floor when the boiler was changed).
If this is a problem do I dare ask the contractor to re-pipe the furnace after all these years? What would be a fair arrangement? (I can see in the manual that comes with the furnace that they have the correct piping clearly shown)