Replacing a Boiler Air Vent

[Mike Lamb]

What's a guestimate to replace or fix a leaking boiler air vent that is dripping in an attic.

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[ghentjr]

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.

[Tom Raymond]

How old is the boiler, and how hard is the water?

Twice in the last year I've had the regulators on feed valves stick shut when they were closed to service the boiler.

Triple John's estimate.

[kurt]

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 +-.