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Replacing a Boiler Air Vent


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Homeowner, the price of a new vent. Plumber, $100 to 150. Just shut down the boiler water feed, release the pressure and drain water below the valve, unscrew the air valve and put a new one in. (I assume it is not soldered into place) Because it is in the attic you would not have to drain more that a quart or two of water. Then when you turn the supply back on bleed the valve.

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That's right. There's always a stuck valve, regulator, or control that means draining down the system. If there's not enough isolation valves, and there's never enough, it's usually a drain down scenario meaning $500 +-.

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