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expansion vessel

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  1. S

    Expansion Vessel Size

    Hi I have a Grant 26-36 S Pro boiler fitted with underfloor heating and DHW. The system was fitted about 3 years ago (not by me) and has worked well since then, only issue is topping the system up every now and then. Pressure has never fallen sufficiently to stop the system working I have just...
  2. D

    Re-pressure expansion vessel / glow-worm fuelsaver

    Hi folks, I bled a radiator, then checked the pressure gauge on the expansion vessel and it reads empty. I've no idea how to top it up as I can't find any taps on the pipes or boiler. Does it also need air pumped in? I've attached a photo of the system. If someone could advise what to do I'd be...
  3. K

    Rusting solar expansion vessel

    Hi all, I popped into see a job today with a problematic solar system. 12 evacuated tubes Twin coil cylinder in the loft, along with pump station and expansion vessel. System not circulating but pump running, I checked the expansion vessel and saw it was badly corroded and leaking Goooo...
    • Kev the gas
    • Thread
    • expansion expansion vessel vessel
    • Replies: 6
    • Forum: Central Heating Forum
  4. R

    Do I need an external expansion vessel for my Vaillant system?

    Hello all I am new to this forum and I do not want to undertake any work myself. I just want my heating system to work more effectively. Apologies for such along first post but I see from reading other posts that giving as much detail as possible seems to lead to very constructive advice. I...
    • retired man
    • Thread
    • expansion expansion vessel system vaillant vessel
    • Replies: 24
    • Forum: Central Heating Forum
  5. I

    Advice on re-filling expansion vessel

    Hi, Last time the tundish started dripping on my pressured system, the plumber re-pressurised the expansion vessel to 3bar as per the label on the tank and all was fine for say 1-2 years before the dripping started again. This was as before, about 10 minutes after the boiler fired up to heat the...
  6. J

    expansion vessel

    hi guys vokera compact combi boiler is it poss to remove and replace expansion vessel without removing boiler from wall as stated in vokera manual cheers john. :cry_smile:
  7. C

    commercial expansion vessel

    Hi I'm a domestic engineer and I'm now moving onto commercial work I have leaks coming from 3 big expansion vessels and I think they are leaking from the top were 1 has a leaking blank end 1 has a quarter turn valve and one has nothing on it. As there is water there at all I believe the...
  8. R

    Pipe size going into expansion vessel on sealed heating system

    Hi all, Ever since I was an apprentice plumber going back 20 or so years when we installed sealed heating systems - We always made sure that 22mm pipe would go into the expansion vessel ie do away with the actual fittings that come with it which were 15 mm and put our own 22mm female to copper...
  9. T

    Replacing expansion vessel on a unvented hot water only storage system (package type)

    Hi, I have a failed expansion tank (which is full of water and has 0 bar pressure) on my unvented hot water storage system. Currently the pressure relief valve is venting water to the overflow. This diagram matches what I have: I want to try and do the job myself if possible but it seems...
    • thebigred
    • Thread
    • expansion expansion vessel hot water replacing system unvented vessel water
    • Replies: 15
    • Forum: Central Heating Forum
  10. M

    External Expansion vessel

    I'm wondering if there is a slimline alternative to the football sized 'Robokit'. Say something like the rectangular Vaillant or Baxi ones. The question would be how to securely mount it.
    • mountainman
    • Thread
    • expansion expansion vessel vessel
    • Replies: 3
    • Forum: Central Heating Forum
  11. C

    Baxi combi instant expansion vessel problems

    Hi fellas, could do with a bit of tech knowledge, went to a job today , boiler leaking water , found expansion vessel had blown and rusted round seam .Took boiler off wall and removed vessel. Found it had two ports on it ,both 3/4 . Tried to get through to Baxi tech help to no avail. Capped off...
    • Chris Bathroom
    • Thread
    • baxi combi expansion expansion vessel vessel
    • Replies: 1
    • Forum: Central Heating Forum
  12. I

    What is the normal pressure in an expansion vessel? - Will 4psi make old TRV's leak

    Hi Can anyone tell me what sort of pressure an expansion vessel normally runs at, on a normal GCH system, when it is heating I've just put an 18 litre expansion vessel as a temporary replacement for a first floor open header tank, to see what happens if the system is run at pressure. I've...
    • interesting100
    • Thread
    • expansion expansion vessel leak pressure vessel
    • Replies: 15
    • Forum: Central Heating Forum
  13. I

    Can you put Expansion vessel in the same location as previous open ventd header tank

    I have a header tank at ceiling height on the first floor and we want to put rads on the 2nd floor above the header. - It would be v. difficult to raise the header tank Is there any reason why you can't put an expansion vessel in the same place as the existing header tank, so it replaces...
    • interesting100
    • Thread
    • expansion expansion vessel tank vessel
    • Replies: 16
    • Forum: Central Heating Forum
  14. S

    determining size of water expansion vessel

    how do you determine what size of expansion vessel is needed for each job? Also, how do you decide what size of radiator is needed for a particular room? thanks in advance
    • shezzaar
    • Thread
    • expansion expansion vessel size vessel water
    • Replies: 2
    • Forum: Central Heating Forum
  15. M

    Expansion vessel deflated.

    i was called to an alpha cb50 today. The pressure had been gradually decreasing and all of a sudden it became faster. I check the prv pipe and it had was not dripping but water was in the pipe and a little wet patch on the floor. So get to the expansion vessel and no charge what so ever. So i...
  16. M

    gledhill cb 35 expansion vessel part number??

    does anyone know the part number for the expansion vessel and pipe for this shed of a boiler as i cant find it any where!! gc 47-317-01....can't even ring their tech line as my mobile wont allow calls to a premium number....gledhill are poo
  17. M

    Composite valve for expansion vessel

    Hi, Do they make a composite valve arrangement that includes the expansion valve and filling loop. (Not including the pressure relief valve) So this can be positioned on the return of the system. And the pressure relief on the flow.
  18. 5

    External expansion vessel.

    Well, I have to go back to a heating job where the boiler expansion vessel needs changing,. For a number of reasons I intend fitting an external one. I am going to put it below the boiler using a half inch to 15mm adaptor, to 15mm then to a flexible hose to connect to the return to the boiler...
  19. A

    Potterton promax system 24 he plus expansion vessel. Can I recharge?

    Hello, My boiler has started to lose pressure. I placed a bag over the pressure release valve drain and then pressurised system to 2 bar with the heating off. It remained steady and didn't lose pressure. I then switched the heating on and watched the pressure. It gradually increased to 3 bar...
    • ashy
    • Thread
    • expansion expansion vessel plus potterton system vessel
    • Replies: 4
    • Forum: Central Heating Forum
  20. X

    New Boiler & Expansion vessel - red needle very high

    I'll post the cliffnotes before as it turned into a somewhat long post: * boiler died end of last year * housing had everything replaced (regular boiler) this time last month (January). Baxi Solo 15HE installed. * red expansion vessle/tank fitted (attic expansion tank shut off i think??) *...
    • Xad
    • Thread
    • boiler expansion expansion vessel high new boiler vessel
    • Replies: 9
    • Forum: Boilers
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