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Anyone have trouble with Taco 418 / 419 automatic air vents? A couple of heating contractors was using them on condensing gas boilers and they are only lasting about 4 years. Water leaking right out the top of the air vent. Pressure in the boiler / system no higher than 18 PSI. Contractors checked the boiler expansion tank and they are fine. Boiler relief valves are not releasing any water.
Would a Spirovent spirotop air vent work better and last longer?