Here’s a photo of my boiler. The pipe that’s putting water on the floor is the left-most one, with the green tag. it runs down in front of the boiler and empties onto the floor. Water is still coming out intermittently.


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  1. aahhh eman1234. Glad to see you back in true form. You were getting a little soft on some other recent posts. Do you drink(alcohol)?

  2. the whole installation looks kind of shitty…have your plumber ascertain that the expansion tank is properly sized and the pressure relief valve has not gone bad

  3. I see you have a tankless coil making your domestic hot water. Excessive pressure in your boiler could mean a leaking coil. But there are lots of other reason for high pressure.
    Anyway, that’s a crappy Slant/Fin builder’s grade boiler and the circulator pump is on the return, pumping into the boiler, which adds to your pressure reading.
    Not so good.

    As for expansion tanks: The old style should be about half full of water and should be drained periodically.
    Compression, or bladder, tanks with a diaphragm need to be charged with air to a pressure matching the system’s for them to be effective. Attach a bicycle pump to the Schrader Valve (that’s the technical name of a tire’s air fitting, betcha didn’t know that) on the air side of the tank and pump it up while it is detached from the piping.

  4. That pipe is the overflow from your pressure relief valve. One of two problems could be happening.

    The pressure in your boiler could be too high. If that be the case, the valve is doing the job it was designed to do.

    or

    The valve has gone bad and is dribbling water even though the pressure is ok in your boiler. This happens on occasion when the spring in the valve starts to weaken. It can also occur when someone has tripped the valve (I had done this as a kid because levers and red toggle switches are irresistible to a kid)and a little dirt gets between the valve poppet and the seat.

    Have a plumber come and ascertain the problem and properly address it.

    Good luck.

    -Steam Man

  5. sorry, I cannot confirm or deny this. I have old style tank. Do you see reading of the pressure meter? Does it reaches point marked with dark red message “DANGER”?

    It might be pressure valve or something else. Probably better to call service.

  6. i have a diaphragm-style expansion tank, so i think that i would have to pump up the air chamber, rather than draining it. am i correct in thinking that pumping up my tank achieves the same result as draining an old style one? thanks for the help!