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rogerusp 06-22-2013 09:36 AM

Leak on top of hydro heater system
Hi folks
I just bought a house and notice a leak coming from a piece on the top of my hydro heater system. Pictures attached. Any help on clarifying if this is something normal or needs to be repaired?

beenthere 06-22-2013 09:48 AM

Its an auto air vent. Easy to replace. Need to shut all teh water valves first though. And to belld off the pressure from the boiler before removing it.

rogerusp 06-22-2013 09:49 AM

Thank you!

beenthere 06-22-2013 09:53 AM

PS: Until you replace it(this summer yet). You can tighten the cap on it so it stops leaking water.

rogerusp 06-22-2013 10:30 AM

Just called a local HVAC company and they charge 185 just to show up and check the problem. Does it sound about right?

beenthere 06-22-2013 10:50 AM

Thats a little more then me. But every area and company is different.

I'd call another company or 2 to see what they charge.

taxmantoo 06-22-2013 11:17 AM

How big are the threads on that, 1/8"??
Since this is a DIY site...

(but buy it from your friendly local hardware store, then it comes with free installation advice and you can swap it easily if the threaded fitting on the bottom isn't the same size as what you have)

rogerusp 06-22-2013 11:56 AM

Much appreciated guys. Just worried the thing can splash boiling water in my face if i dont follow the right steps

FClef 06-22-2013 01:22 PM


Originally Posted by rogerusp (Post 1205527)
Much appreciated guys. Just worried the thing can splash boiling water in my face if i dont follow the right steps

OK, here are the steps to do this without having to drain the entire system. Please note that this method will result in the least possible water being drained. You may get a little water when you remove the air vent, but it is not going to be spraying all over the place, it will likely trickle out slowly. Oh, and it is best to put either towels or a large piece of cardboard on top of the unit so that what water does come out doesn't fry any controls. Take any precautions you feel are necessary, like gloves, safety glasses etc.

1. Get any hand tools you may need, like a pump pliers but more than likely you can do this all by hand.
2. Put pipe dope on the threads of the new air vent.
3. Shut off the automatic water feeder to the boiler.
4. Attach a garden hose to the boiler drain and run the other end to a drain.
5. Open the boiler drain and watch the pressure gauge on the boiler.
6. When the pressure reads ZERO PSI you can now remove the old air vent.
7. Quickly put the new air vent in place and take care not to cross thread as you tighten it.
8. Once the new air vent is tightened then you can close your boiler drain and turn your water feeder back on. And loosen the little cap on the air vent if it isn't already. If you think it is needed you can use the pump pliers to tighten the air vent but don't go overboard. normally hand tight and a quarter turn is more than enough.

rogerusp 06-22-2013 01:52 PM

Thank you fclef! Will give it a try

rogerusp 06-22-2013 02:19 PM

The cap should be tight or loosen a bit?

beenthere 06-22-2013 02:57 PM

Loose on a new one. When they wear out, or get dirt in them. they tend to either not let water or air out. Or they constantly leave water come out. And until its replaced, its best to tighten it to prevent water from constantly coming out.

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