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Old 11-05-2013, 02:28 PM   #1
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Oil boiler leak from valvle


My oil boiler seems to be leaking from the valve. I bought the house about 1.5 years ago and did not notice the bucket behind the boiler. It took about 6 monther to fill the first time. now its filling in about a week.
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Old 11-05-2013, 02:47 PM   #2
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Oil boiler leak from valvle


turn boiler off , turn water off to boiler drain your expansion tank about half way then turn water on then turn boiler on, assuming you have a steel tank in ceiling. If you have a compression type tank the bladder may be broken and need replaced

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Old 11-05-2013, 02:53 PM   #3
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Oil boiler leak from valvle


Yes there is a steel tank in the ceiling.
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Old 11-05-2013, 02:58 PM   #4
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Oil boiler leak from valvle


it is probably full no where for the water to expand so out the relief valve it goes
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Old 11-05-2013, 03:00 PM   #5
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Oil boiler leak from valvle


you said to "drain your expansion tank about half way" the turn the water back on. what should I look for/what will this tell me? Thanks for your replies.
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Old 11-05-2013, 03:53 PM   #6
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Oil boiler leak from valvle


If the expansion tank is full the pressure will pop the relief valve.

How many stories is your house? You're showing about 28 psi in the system, that's a bit on the high side. A lot of relief valves start to pop at 30. 200 degrees is also high, you could adjust the aquastat for about 180.
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Old 11-05-2013, 03:57 PM   #7
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Oil boiler leak from valvle


my house has 2 floors above the basement, where the boiler is.
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Old 11-05-2013, 04:01 PM   #8
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Oil boiler leak from valvle


25 would usually be about the upper limit that you'd want to see.

The steel type tanks tend to get waterlogged and need to be bled. You might consider changing over to a bladder type expansion tank - no maintenance required.

I'd still kick the temperature down a bit.
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Old 11-05-2013, 04:06 PM   #9
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Oil boiler leak from valvle


Just to add, the relief valve can fail as they get old but you're pushing the limits with yours at 28 psi. There should be a pipe extending off of it leading to a safe point, near the floor, as well.

Have you had the boiler serviced? It's pretty much required every year for an oil burner, they'll clean the boiler and the nozzle. Your serviceman can swap out the valve and drain the expansion tank.
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Old 11-05-2013, 04:12 PM   #10
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Oil boiler leak from valvle


Wow your water temp is really high at 200. Also pressure is high around 30. My water temp runs between 140-160. My pressure runs around 14-18. I think you just need a new expansion tank. They give up after a while. Not expensive. Just twist off twist new one on,

Ps. Check back one of the hvac guys will probably chime in this evening. Don't do anything until one of the hvac guys chime in.
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Old 11-05-2013, 04:28 PM   #11
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Oil boiler leak from valvle


I had it serviced a year ago and I am getting ready to have it serviced again. I was just trying to get a handle on what the issue is before talking to the service guy. Is draining the tank part of a typical service. Will they typically ajust the temperature. This is my first house with oil and my first house without natural gas, so i new to all of this. I have a service contract with the "Platinum Plan" if that means anything. They serviced it last year but did not mention the bucket behind the unit and at that time i hadn't seen it myself. He also did not mention the 2 holes in the exhaust pipe. You can see one of them in the picture. i'm assuming the holes aren;t a problem since it does not set off my co2 detector.
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Old 11-05-2013, 04:34 PM   #12
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The holes are where they put the probe for the combustion efficiency test.

I'd be curious as to what they're really doing during their service call. Checking the pressure and temp is an easy thing for them to do and can help pinpoint any problems. Same with an obvious leak.

They should at least note it in their inspection report.
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Old 11-05-2013, 04:38 PM   #13
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not sure what they do. My wife said they were there for 2.5 hours last time. I am using the same company that the previous owner used. They have a chart hanging next to the boiler with some reading from the last 15 or so services with some temperatures and efficiency calculations, etc. They are one of the more reputable oil companies, been in business a long time.
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Old 11-05-2013, 05:37 PM   #14
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Oil boiler leak from valvle


phone them and talk to the service manager and tell him of these issues so he is aware to send the proper guy. some techs only do the actual oil burner part and then they send a plumber for the expansion tank etc. some techs can do both but depends on the company and how well they are trained.
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Old 11-05-2013, 06:25 PM   #15
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Oil boiler leak from valvle


best guy to work on a boiler. Is a plumbing/heating guy. This is what my guy is. Plumbing/heating/air-conditioning.

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