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Old 11-05-2013, 05:45 PM   #16
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Oil boiler leak from valvle


Yep, draining an expansion tank is not as easy as it sounds or bleeding rads etc. leaks happen etc. there are service plumbers and service electricians and others are installers. some just know how to pull wire or the back of a spade and others can actually do service work.

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Last edited by yuri; 11-05-2013 at 05:53 PM.
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Old 11-08-2013, 09:29 PM   #17
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Oil boiler leak from valvle


If the system was serviced this fall the expansion tank (you say is in the ceiling) should have been drained. over the summer when the boiler isn't used as often the water cools and shrinks and the automatic feeder lets more water in. You turn the heat on for the season the water gets hot and there is no room for expansion because the tank is full.Have the tank drained and keep and eye on the pressure just in case the feeder valve or perhaps if you have one, the tankless coil is starting to go.
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Old 11-09-2013, 07:37 AM   #18
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Oil boiler leak from valvle


We use it year round for hot water
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Old 11-09-2013, 08:01 AM   #19
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Oil boiler leak from valvle


yeah, but you don't use the heat , the water in the radiators or baseboard
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Old 11-09-2013, 08:47 PM   #20
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Oil boiler leak from valvle


The leak from the pressure relief valve is due to excessive pressure in the boiler/system. The gauge is reading almost 30 pounds/psi. The relief is made to open at 30psi.

For some reason too much water pressure is in the system. This can be due to a malfunction of the pressure reducing fill valve. It can also happen if there is a bad valve in the supply water piping that is letting water by it when closed.

Another thing that could be causing your issues is: If you have an air captive expansion tank in the floor joists above the boiler there should not be any automatic air bleed valves in the system.

As others have said, make sure the service company knows you are having an issue with excessive pressure in the boiler and a relief valve that is leaking so that they send someone competent to deal with this issue and the type of system you have.
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Old 11-10-2013, 08:11 AM   #21
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Oil boiler leak from valvle


Auto water feed may be bleeding through.
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Old 11-23-2013, 03:09 PM   #22
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Oil boiler leak from valvle


A little late however, to reinstate the aor cushion in the tank itmust be completely drained to allow air to enter an,d fill thetank. Then when the water is turned back on it will creat a proper
Cushion. Water level will likely be about half Also, yes,your watertempiswayhigh or.the guage is wrong..makesure temp settings are checked and adjusted correctly
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Old 12-04-2013, 10:23 AM   #23
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Oil boiler leak from valvle


Repairman came yesterday and drained the tank and installed a new valve. The bill he lesft came to $342, 146 of whick was for draining the tank. I have a contract with the company so i think i will only have to pay $92 for the new valve. I watched the guy drain the tank. Nothing to it, not sure what yuri was talking about when he said it is not as easy as it sounds.

1. turn off power to boiler.
2. attache garden hose to tank drain
3. close inlet valve.
4. open drain valve.
5. open air valve on inlet valve.
6. let water drain.
7. repeat steps 1-5 in reverse order, but do opposite.
8. save $146.

Last edited by mike.shultz46; 12-04-2013 at 10:25 AM.
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Old 12-04-2013, 10:45 AM   #24
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Oil boiler leak from valvle


What about turning down the temp? 200 is hot. 180 is the usual.
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Old 12-04-2013, 10:46 AM   #25
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Oil boiler leak from valvle


Do not forget...mix a littl e dish detergent and water and brush around fittings and joints to check for air leaks ...tighten or refit to eliminate leaks and prevent tank from becomong water logged

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