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Will air in line effect heat output of BB
I have have a new installation with 3 zones all fed with their own zone pump. It seems that in the upstairs zone there isn't much heat comming out of the BB even with 160* water. I am thinking that perhaps there is air in the line. I do not hear any noise of water running. I just cleaned all the BB removing dust and dog hair,etc. The BB are in the order of 30-40 years old. Do they tend to loose the ability to raidiate heat with age?
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