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expansion vessel

  1. Steve weightman

    Expansion vessel in a domestic house

    Any reason why this cold water expansion vessel would be found in a domestic house it's massive
  2. J

    Expansion vessel appears ok, but boiler operating pressure at 3 bar.

    Hi. It would appear that the expansion vessel is ok, and yet the boiler pressure is operating and exceeding 3bar. The PRV does leak before 3 bar and I know needs replacing, but what could be causing the high operating pressures. Thanks
  3. D

    Unvented Cylinder Expansion Vessel - advice sought

    Hi, I am a homeowner, I had a new unvented cylinder (OSO DC 300) fitted in August, and had a small problem yesterday with the pressure valve dumping water and making a lot of noise. Eventually this was resolved. However, during my conversations with plumbers it appears that I have a red...
    • David C
    • Thread
    • cylinder expansion expansion vessel unvented unvented cylinder vessel
    • Replies: 21
    • Forum: Central Heating Forum
  4. R

    Expansion vessel on a flexi - illegal?

    Saw a photo a customer showed me of what seemed to be a flexi installed on an expansion vessel serving a small electric water heater by someone he found who was cheaper than me. I say 'seemed to be' because I'm not sure from the angle of the photo whether the flexi was attached to the vessel or...
  5. R

    Replace heating system pressure relief valve and expansion vessel

    Calling all pro plumbers :D I appreciate this isn't black and white, but in its most basic form could anyone give me a rough idea of how much it would cost (in terms of parts and labour) to carry out the above titled job for an oil fired boiler. Just a ball park figure would be great. Many...
    • Robot22
    • Thread
    • expansion expansion vessel heating heating system pressure replace system valve vessel
    • Replies: 8
    • Forum: Central Heating Forum
  6. H

    Heating Expansion Vessel

    Hi Forum, I recently fitted a new Grundfos pump on my sealed heating system. For some unknown reason I was having trouble getting rid of air, I would empty radiators with air returning again later, I've been repeating the task for over a week. Last night, I was reading up on what might cause...
  7. D

    Expansion Vessel Placement Advice

    Hi, I intend to install an EV (expansion vessel) to my cold water line as I'm having problems with pressure affecting my water heater and taps. When the water gets really hot, the safety relief valve is triggered and drips. I never understood why this happened until it occurred to me that this...
    • Deleted member 97000
    • Thread
    • expansion expansion vessel vessel
    • Replies: 25
    • Forum: Central Heating Forum
  8. J

    Expansion vessel saga continues...

    Evening all, i’m looking for advice... Technical: I have PP150B Santon direct unvented hot water cylinder, cold water regulator at 3.5 bar and expansion vessel at 3.5bar. All the pipes are “clipped”. Information from plumber. I’ve only just moved in to my first house, which is approx. 13 years...
  9. D

    Banging expansion vessel when turning on taps

    Hi, had a new pressurised system put in about a year ago...long long story bu the guy whom put it in does not have the greatest aftercare available...lets leave it at that! Anyway, all is working fine with the exception of when the taps have not been used for a short while, if you turn them on...
  10. L

    Boiler prv and expansion vessel

    Hi. I’m looking for some advice. I recently bled my radiators then over pressurised the boiler (one of the filling valves got left open) this led to the prv opening and draining water. I got a plumber out and he said the valve didn’t reseat properly due to debris in the pipe so he flushed some...
  11. B

    fog horn sound after changing expansion vessel

    This a cry for help ! ! and apologies for the lack of knowledge displayed as I'm just a house owner. Nobody seems to have the knowledge to identify what the fog horn sound is and I'm at my wits end! Even Tempest haven't got a clue! So i have a Combi boiler and a Tempest cylinder in the loft...
  12. B

    Ideal Isar HE expansion vessel

    Hi, Just a quick question. Does anyone know if the expansion vessel Schrader valve is accessible on an Ideal Isar HE30 combi boiler? I couldn't see the valve on one today to check it, and if the valve is accessible can you get to the valve enough to replace the Schrader valve if it starts to...
  13. C

    Expansion Vessel Size

    I had a boiler fitted over 3 yrs ago. It is a commercial boiler - 100kw. The installer fitted an expansion vessel which is about 20 litres. We have about 33 double rad and 2 single rads on the system. Someone mentioned to me that the expansion vessel is way too samll as we constantly have to...
  14. M

    Baxi DuoTec 28 HE Expansion Vessel Issue.

    Hi All I have an issue with the boiler building pressure quickly to over 3 Bar and the safety valve kicking in. The expansion vessel has been re pressurised and holds air. would/could it be that the micro bore wet pipe is blocked?
  15. R

    How do I know if expansion vessel faulty

    Evening everyone so I’m just wanting to as a quick question please, how quickly would the pressure rise to over 3 if my expansion vessel is faulty been using the boiler but only a hour at night and at morning just now as it’s heating up the house with being mild ish outside normally over the...
  16. hary_j

    Expansion vessel leaking or blocked heat exchanger

    Evening gentlemen, Stopped at my last job today, it was a vaillant eco tec plus 837 combi. Boiler is building excessive pressure, whether it be on DHW or CH mode. Upon firing up on CH mode, pressure rises to maximum and prv lets by at 3.5bar all within around 5-10mins of being operational. I...
  17. Rob Foster

    Expansion Vessel - Not sure abouts its purpose

    Can somebody please explain the function of the expansion vessel on my heating. Is it to absorb the increased volume of water when its hot or/and to be a reservoir of water to top up the heating system when there are small drips Many thanks
  18. Scott_D

    Expansion vessel - not ugly

    Looking for a small additional expansion vessel for a heating system to go next to a combi as there are a few big column rads in the house. Ideally not something ugly :confused: so the standard red type is out. I have seen some online pictures of a compact almost like a squashed football but no...
  19. N

    Expansion vessel connector / pressure valve replacement

    Hi all. I need to replace a expansion vessel as it's leaking and and the same time I would like to relocate it within the same cupboard. I have done a fair bit of plumbing work over the years (good standard DIY'er) so the job itself looks manageable but I have a couple of questions. BTW, I plan...
  20. Scott_D

    Expansion vessel hose popped off

    The hose to the expansion vessel popped off on this logic+ combi I was fitting today. Been under pressure for a week. Fired up for an hour today then put into max to commission and it flooded the boiler. Ideal are coming out Thursday.

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