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Air in my hydronic heating system
We have a hydronic heating system with three zone valves. For some reason air keeps getting into the system. The pressure tank is good and I try to maintain a pressure around 15 to 20 psi. there is an air eliminator on the system too. I bleed the air out at one of the bleeders on one on a radiators. For the last two years I ran vinegar through the boiler to remove the lime. Closed the ball valves at each zone so the vinegar stayed in the boiler. The flushed it with clean water. Anyway I am having to bleed the air every day to no avail. How does the air get into the system?