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[5050racing]

As u heat any water air will come out so before it gets raised to the 2nd floor hot water coil to eliminate any air that my want to come out of solution before it goes up to attic n get trapped up there,I don't have a bleeder in attic removed it cause without the pressure it was wanting to let air in, my circulater pump runs all the time to it,that's how u keep the water up there without getting air in it it works great for 2 years now no heat exchanger open system works for me