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expansion vessel

  1. 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...
  2. 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:
  3. 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...
  4. 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...
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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...
  12. 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
  13. 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.
  14. 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...
  15. 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
  16. 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: Boiler Advice Forum
  17. R

    Dripping Tundish...Closed Unvented System...Depressurised Expansion Vessel.

    Hi all, bit of a novice on this but here goes. I have noticed that the Tundish is dripping constantly alongside my Tribune HE cylinder. The Central Heating and Hot Water system are working fine it appears. There are two expansion vessels above the cylinder one small red one with the pressure...
    • rosstheboss1972
    • Thread
    • expansion expansion vessel system unvented vessel
    • Replies: 2
    • Forum: Central Heating Forum
  18. S

    Vokera Linea 730 pump / expansion vessel

    Hi I have a Linea 730 Vokera boiler that has code 4 on the display (low pressure). When I top up the pressure water leaks from the top of the external brass part on the pump next to the hose leading to the expantion vessel. For the last few weeks the pressure has read 0 yet the system has...
    • Stew C
    • Thread
    • expansion expansion vessel pump vessel vokera
    • Replies: 4
    • Forum: Central Heating Forum
  19. P

    Expansion vessel

    Hello i repressurised my expansion vessel with water to 1.5 bar heating put on this evening the gauge is going up to 3 how do I reduce the pressure as I am a bit concerned it is to high, is it just a case of bleeding a radiator to let out water? Tim
    • Puttmeister
    • Thread
    • expansion expansion vessel vessel
    • Replies: 17
    • Forum: Central Heating Forum
  20. P

    Expansion vessel

    Hello, from a new member i have a new build property, the ch system has an expansion tank on the top of the water cylinder I have a few questions 1. When the system is off the gauge says 0 is that right? 2 when the system is on it only reads .5 as a maximum pressure 3. I need to refill the...
    • Puttmeister
    • Thread
    • expansion expansion vessel vessel
    • Replies: 3
    • Forum: Central Heating Forum

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