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Discuss Water heater leak, is piping wrong? in the Valves & Taps area at

  1. Ben Karsin

    Ben Karsin New Member

    I'm a renter of an apartment with a Viessmann Vitodens 222-w heater. I came back from a 1 week trip and my heater leaked into the ceiling of the apartment below me! I don't know what happened, but after some research, I suspect the heater wasn't installed correctly.

    Here is a picture of the heater how it is currently installed and a picture with me pointing to where the leak is happening.

    When I look at diagrams of the installation of this heater, I don't see anything about this overflow pipe on the water intake. Also, the connection between the brass and grey pipe is not sealed. Here is another picture of how the heater is installed:

    What worries me the most is that may be other issues (problems with ventilation?) that could cause health problems to me and my wife. Any advice or thoughts on this situation would be a great help! Thanks!

    - Ben
  2. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    I believe, and stand to be corrected, that Viessmann can be piped with combined prv and condense??

    It’s by no means the tidiest install but ive seen worse.

    Do you have a current gas safety cert?? What makes you think the vent/flue has issues ? It’s a bit of a statement just to guess?
    • Like Like x 1
  3. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Thats not a 222 pal , it looks like a 200 but is different to what I have seen , are you in England ?
    • Like Like x 1
    • Winner Winner x 1
  4. Stu-B

    Stu-B Member

    Is this install in the U.K.? I’m saying this cos The power socket doesn’t look like U.K. 3pin at all.
    The viessmann 222-W is a storage combi so the grey pipe you point to is on the cold feed expansions relief valve, but it’s not like any combi valve I’ve ever seen, plus no tundish etc. I’ve not fit this particular boiler but I have fit it’s smaller brother the 111-W which is basically the same but a smaller store.
    If there’s water coming from the grey pipe you point to you, the exp vessel may have lost its charge, you need an engineer with a g3 qualification to service it
  5. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    correct lads (they are from Brussels)
  6. Ben Karsin

    Ben Karsin New Member

    Thanks for the feedback everyone! Yes, I am in Brussels, but I don't speak very good French and my landlord is not the most helpful guy... I was hoping that it was something that could be easily fixed, but from your comments I guess I need to find an engineer that can deal with it.

    If the problem is the exp vessel losing its charge, could that have just happened randomly while we were gone?

    My comment about the vent/flue was just a guess out of fear (I do have a carbon monoxide detector, though).
  7. Ben Karsin

    Ben Karsin New Member

    I managed to fix the leak. The connection that I pointed to was missing a sealing rubber ring, so I just added one and the leak is gone. However, I'm a bit confused about the two valves that I circled in the picture below.


    When both valves are on (as seen in the picture), everything seems to work fine and hot water is flowing correctly, but I hear a constant sound of running water from the boiler (it never stops). Is this the correct configuration, and if so why the constant sound of flowing water? Also, why didn't this leak happen earlier if there was no rubber ring? Again, thanks for the help and sorry for being such a novice.
  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Blue top valve is that flowing into the grey pipe

    If it is it shouldn’t be so need the services of a heating engy
  9. Stu-B

    Stu-B Member

    Fixed the leak but not the issue, now the issue just goes down the drain.
    Time to get a professional involved
  10. Ben Karsin

    Ben Karsin New Member

    Yeah, I guess I'll wait until I can contact my landlord, then. This whole city shuts down every Sunday (including calls and emails).
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