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expansion vessel

  1. S

    Expansion vessel size large system

    Have seen many differing formulas for this. My system volume is 1417 litres My static head is 11 metres PRV set at three bar One calculation I found said it should be 145 litres... can you imagine? Another said 50, which seems more realistic! Cheers
    • slide
    • Thread
    • expansion expansion vessel size system vessel
    • Replies: 13
    • Forum: Central Heating Forum
  2. F

    Shock arrester or mini expansion vessel

    Fitted a baxi duo tec last week , and the hot water cycle starts , as the cold water is used, spoke to baxi and they said , I need to fit a shock arrester/mini expansion vessel , baxi say this is becoming really common , it's never happened to me before , can this be fitted anywhere on the cold...
  3. C

    Expansion vessel

    Went to a job today to replace a 12ltr expansion vessel on an unvented cylinder. The bladder had burst and the vessel had filled with water, not too bad......unfortunately the person who installed it used the pig tail plasterboard fixings and it came away from the pipework flooding the house! 2...
    • Ch4 plumbing
    • Thread
    • expansion expansion vessel vessel
    • Replies: 17
    • Forum: Central Heating Forum
  4. G

    external expansion vessel on combi

    Hi all i am going fit a external expansion vessel for a combi . The current one is split on hermann icon 23t so i am going to cap it and fit a 12 litre external expansion on the return . The question is will the boiler be ok in hot water or will it over presurise during dhw operation due to...
    • gizmolang
    • Thread
    • combi expansion expansion vessel vessel
    • Replies: 14
    • Forum: Central Heating Forum
  5. C

    Expansion vessel on unvented system is hissing

    I have an unvented system in my home. The fitters that installed it recently came back to replace the expansion vessel as it kept hissing. They said it was a fault with the seal on the expansion vessel. Unfortunately, the new expansion vessel is still hissing. It sound like boiled water...
    • CNelson
    • Thread
    • expansion expansion vessel system unvented vessel
    • Replies: 28
    • Forum: Central Heating Forum
  6. B

    DHW Cylinder Expansion Vessel Pre-Charge

    Hi guys I have a quick question regarding the correct pre-charge pressure for an expansion vessel (24 ltr) on the cold supply of a DHW cylinder (300 ltr). As measured after a combined 3 bar PRV + 6 bar safety relief valve assembly, the static pressure of the cold supply is 2.5 bar. The...
    • belfastbob
    • Thread
    • cylinder expansion expansion vessel vessel
    • Replies: 7
    • Forum: Central Heating Forum
  7. M

    Worcester Heatslave 20/25 heating cutting out - extra expansion vessel??

    Hi there, we've had a 20/25 second hand boiler installed, replacing a very old 20/25. The heating cuts out and diverter goes to hot water and stays there, pump stops. I've noticed this can happen after the washing machine fills - the cold inlet tees off very near the boiler mains inlet. I...
    • mchandler
    • Thread
    • expansion expansion vessel heating vessel worcester
    • Replies: 11
    • Forum: Central Heating Forum
  8. J

    Zilmet 300lts Expansion vessel - air leak - faulty weld?

    Hi, I have a 300lt (yes its about 5ft high, 2ft wide) expansion vessel that assists in maintaining our cold water pressure during high demands (3 story 5 showers). It has been working well over the last few years but recently the air pressure has dropped. I have found the leak, it is the top...
  9. F

    T&P Valve or Expansion Vessel

    Hi, Just got back from a week with some friends for xmas, turned the hot water back on and within an hour or so I had hot water gushing from the T&P valve at the same rate the tank was filling. Turned off the hot water and water supply to the tank and the T&P valve stopped after a few...
    • FredTheDog
    • Thread
    • expansion expansion vessel valve vessel
    • Replies: 19
    • Forum: Central Heating Forum
  10. Z

    External expansion vessel

    Got one to fit in a tight space for a mate. Can these be fitted side on ratger stood upright or does it affect its performance
  11. V

    Advice on external expansion vessel.

    Hi all, The expansion vessel on my Baxi Combi 133he plus has died (water from the schrader valve) and I want to fit an external vessel, teed into return pipe via the filling loop. I'm confident at doing the work as have good DIY skills and plumbing knowledge but my wife is scared that it's a...
    • Vic Rattlehead
    • Thread
    • expansion expansion vessel vessel
    • Replies: 24
    • Forum: Central Heating Forum
  12. D

    Advice needed - expansion vessel charge

    Hi there, was just looking for a bit of advice about my expansion vessel. My have a Suprima condensing boiler with expansion vessel - filling loop. The system loses 1 bar of pressure in 12-14 days. I have checked thoroughly for leaks and can't find anything, even a small one. I thought I would...
  13. 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...
  14. 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...
  15. 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
  16. 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
  17. 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...
  18. 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:
  19. 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...
  20. 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...

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